Patent Publication Number: US-11639607-B2

Title: Scaffold having an anti-lift-out device and method for securing a scaffold platform against lifting out

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is the National Stage of PCT/DE2019/100032 filed on Jan. 15, 2019, which claims priority under 35 U.S.C. § 119 of German Application No. 10 2018 103 897.6 filed on Feb. 21, 2018, the disclosure of which is incorporated by reference. The international application under PCT article 21(2) was not published in English. 
     The invention relates to scaffolding, particularly scaffolding which can be hung or is hung as hanging scaffolding, comprising a preferably elongate U-section beam, which is constructed as, in particular, an extruded light-metal U-section beam or aluminium extruded U-section beam and which extends along the U-section beam longitudinal axis thereof and has an outwardly open U profile, and comprising at least one scaffolding floor, which is detachably fixed to the U profile and which has at an end one or more suspension hooks, for example in the form of one or more claws or talons, for suspension in the U profile, and comprising at least one anti-lift-out device, which is detachably connected with the U-section beam and which includes a fastening device and an anti-lift-out body, wherein the U profile of the U-section beam has support limbs which are arranged parallel to one another and parallel to the longitudinal centre plane of the U profile and are connected together by a transverse wall and which have, preferably at their free ends, support edges for the laying-on of the suspension hook or the suspension hooks of the at least one scaffolding floor, and wherein the suspension hook or hooks of the at least one scaffolding floor is or are detachably laid on at least one support edge of the support edges, and wherein the U-section beam has a guiding and fastening groove, which is bounded by the transverse wall and is open in the direction of the support edges of the support limbs as well as towards the inner sides thereof and which extends in a transverse direction transversely to the support limbs and in a longitudinal direction transversely or perpendicularly to the transverse direction in the direction of its longitudinal axis, preferably parallel to the U-section beam longitudinal axis of the U-section beam, and, with formation of a longitudinal slot, is bounded by groove engagement-behind webs, which are arranged at a mutual spacing and along the inner sides of the two support limbs and extend respectively inwardly therefrom and which bound a locking space of the guiding and fastening groove, in which a locking body can be releasably arranged at several positions along the guiding and fastening groove, and wherein the fastening device of the anti-lift-out device comprises a preferably rod-shaped fastening body, the locking body, which is preferably connected with the fastening body, and a securing body, and wherein the fastening body extends in the direction of the fastening body longitudinal axis thereof transversely or perpendicularly to the anti-lift-out body, and wherein the securing body is arranged at the fastening body at a spacing from the locking body, and wherein the locking body is fastened to the fastening body and extends in the direction of the locking body longitudinal axis thereof transversely or perpendicularly to the fastening body longitudinal axis of the fastening body, and wherein the locking body is transferred into a locking setting in which it engages behind the groove engagement-behind webs of the guiding and fastening groove and in which it is releasably fastened in the locking space of the guiding and fastening groove, and wherein the locking body is rotatable by means of or by way of the fastening body about the fastening body longitudinal axis from its locking setting into an unlocking setting in which the locking body is movable by means of or by way of the fastening body in a direction transverse or perpendicular to the longitudinal axis of the guiding and fastening groove away from the transverse wall out of the guiding and fastening groove through the longitudinal slot, and wherein the anti-lift-out body has a passage opening through which the fastening body is inserted so as to be rotatable about the fastening body longitudinal axis thereof relative to the anti-lift-out body, and wherein the anti-lift-out body engages over the suspension hook or hooks, and wherein the anti-lift-out body by means of the securing body by way of the fastening body and the locking body secures the suspension hook or hooks against lifting out of the U profile in a direction transverse or perpendicular to the U section beam longitudinal axis. 
     The invention also relates to a method for securing at least one scaffolding floor of scaffolding, which can be hung or is hung, particularly as hanging scaffolding, against lifting out of one or more suspension hooks, for example in the form of one or more claws or talons, which are arranged at an end of the at least one scaffolding floor, from a U profile of a preferably elongate U-section beam, which is constructed particularly as an extruded light-metal U-section beam or aluminium extruded U-section beam, wherein the outwardly open U profile of the U-section beam extending along the U-section beam longitudinal axis thereof has support limbs which are arranged parallel to one another and parallel to the longitudinal centre plane of the U-profile and are connected together by a transverse wall and which have, preferably at their free ends, support edges for the laying-on of the suspension hook or the suspension hooks of the at least one scaffolding floor, and wherein the U-section beam has a guiding and fastening groove, which is bounded by the transverse wall and is open in the direction of the support edges of the support limbs as well as towards the inner sides thereof and which extends in a transverse direction transversely to the support limbs and in a longitudinal direction transversely or perpendicularly to the transverse direction in the direction of its longitudinal axis, preferably parallel to the U-section beam longitudinal axis of the U-section beam, and, with formation of a longitudinal slot, is bounded by groove engagement-behind webs, which are arranged at a mutual spacing and along the inner sides of the two support limbs and extend respectively inwardly therefrom and which bound a locking space of the guiding and fastening groove, in which a locking body can be releasably arranged at several positions along the guiding and fastening groove, wherein in a first method step the suspension hook or hooks of the at least one scaffolding floor is or are detachably laid on at least one support edge of the support edges of the support limbs of the U profile of the U-section beam, wherein in a succeeding second method step at least one anti-lift-out device—which includes an anti-lift-out body and a fastening device, which comprises a preferably rod-shaped fastening body, the locking body, which is preferably rigidly connected with the fastening body, and a securing body, wherein the fastening body extends in the direction of the fastening body longitudinal axis thereof transversely or perpendicularly to the anti-lift-out body and wherein the securing body is arranged at or fastened at the fastening body at a spacing from the locking body and wherein the locking body is fastened to the fasting body and extends in the direction of the locking body longitudinal axis thereof transversely or perpendicularly to the fastening body longitudinal axis of the fastening body—is mounted in such a way that the anti-lift-out body engages over the suspension hook or hooks of the at least one scaffolding floor and is detachably fastened by means of the securing body by way of the fastening body and the locking body to the U-section beam in such a way that the suspension hook or hooks is or are secured against lifting in a direction transverse or perpendicular to the U-section beam longitudinal axis out of the U profile, wherein during performance of the second method step the locking body is transferred into an insertion setting in which it is inserted in a direction transverse or perpendicular to the longitudinal axis of the guiding and fastening groove towards the transverse wall through the longitudinal slot into the guiding and fastening groove, wherein the locking body is then disposed in an unlocking setting, after which the locking body is rotated by means of or by way of the fastening body about the fastening body longitudinal axis thereof relative to the U profile in the guiding and fastening groove until in a locking setting in which the locking body engages behind the groove engagement-behind webs of the guiding and fastening groove and in which it is releasably fastened in the locking space of the guiding and fastening groove. 
     Scaffolding of that kind and a method of that kind have become known from EP 1 845 215 A1 and the parallel EP 1 961 886 A2. In those, a suspension hook of a scaffolding floor is secured by means of an anti-lift-out body, which engages over the suspension hook and is in the form of an apertured disc, against lifting out of a U profile, which is formed by two parallel support limbs, of a U-section beam. The U-section beam has on its side facing away from the U profile a connecting part integrally connected therewith. The connecting part has two fastening limbs, which respectively extend laterally over the two support limbs of the U profile and by way of which the U-section beam is detachably fastened by means of a connecting tube coupling, which is formed by a coupling half shell, to an elongate scaffolding tube. The apertured disc has a passage through which a securing strap is inserted, which has at its securing strap end facing the U profile a groove block detachably fastened in a guide groove of the U-section beam. The apertured disc is clamped in the region of a securing strap end, which faces away from the U profile, of the securing strap by means of a securing wedge, which engages over the apertured disc, against the suspension hook of the scaffolding floor, which in turn is clamped fast by way of the apertured disc to the associated support edge of the U profile relative to the latter. As a result, the suspension hook and consequently the scaffolding floor cannot be displaced relative to the longitudinal axis of the U profile of the U-section beam. In order to make this possible, the securing wedge initially would have to be released, with elimination of the clamping, by means of a tool such as, for example, a hammer. Then, however, there was the risk of unintended lifting of the suspension hook of the scaffolding floor out of the U profile and consequently dropping down of the scaffolding floor in conjunction with a risk to life and limb. Moreover, the apertured disc in the case of an only-then possible displacement of the anti-lift-out device would under gravitational force slip down along the U profile into a free space present between adjacent suspension hooks either of the scaffolding floor or of adjacent scaffolding floors or entirely slip down into this free space between the two adjacent suspension hooks, so that then further displacement of the anti-lift-out device would no longer be possible without raising of the apertured disc back to at least its clamping height position. 
     A construction scaffolding has become from CH 439 679 PS, in which there are catwalks, which are formed from catwalk frames and wood fillings therein and in which the catwalk frames are provided with cross members of downwardly open suspension U profile members. The suspension U profile members respectively extend along a transverse connecting web of a vertical support frame of the construction scaffolding. The transverse connecting web is an upwardly open U-section web. Serving to secure the suspension of the suspension U profile members of the scaffolding floor is a cylindrical screw which penetrates the transverse connecting web in a passage bore and which is rigidly connected at the top with an abutment plate. A spacer consisting of an upwardly open U-section member, which has a passage bore through which the screw extends, is arranged under the abutment plate between this and a base of the upwardly open U-section transverse connecting web. The abutment plate, which is also termed pressure plate, of the screw is formed as a rectangular plate, wherein the abutment plate longitudinal axis thereof extends transversely, i.e. perpendicularly to the longitudinal axis of the transverse connecting web. The screw is provided at its screw end, which protrudes at the underside of the transverse connecting web, with a nut. Through tightening the nut the abutment plate of the screw is pressed against the suspended suspension U profile members and secures the latter against unhooking. By virtue of the spacer, excess transverse play of the suspension U profile members of the scaffolding floors in the upwardly open U-section transverse connecting web is avoided. This securing device has, in the final analysis, the same disadvantages as the afore-mentioned construction. 
     It is an object of the invention to make available scaffolding or hanging scaffolding and a method of the kind stated in the introduction which makes possible—with a simpler and more secure capability of mounting of its anti-lift-out device—a greater degree of assembly flexibility, particularly with respect to scaffolding components able to be fastened to or supported on the U-section beam. 
     According to the invention this object is fulfilled, in the case of scaffolding of the kind stated in the introduction, particularly according to claim  1 , in that the anti-lift-out body extending in the direction of the anti-lift-out body longitudinal axis thereof, particularly parallel to the U-section beam longitudinal axis of the U-section beam, is a component of an anti-lift-out and support body, which comprises a support body, which is fixedly or rigidly connected—particularly by welding—with the anti-lift-out body and which extends transversely or perpendicularly away from the anti-lift-out body up to a support body end and is supported by its support body end on the transverse wall of the U-section beam, and in that the passage opening of the anti-lift-out body is formed in such a way that the locking body is movable by means of or by way of the fastening body in the direction of the fastening body longitudinal axis thereof as well as transversely or perpendicularly to the longitudinal axis of the guiding and fastening groove through the passage opening of the anti-lift-out body, preferably insertable and reinsertable thereat. 
     It can thereby be achieved that in the case of displacement of the anti-lift-out and support body in a displacement direction along the U profile of the U-section beam into a displacement setting, in which it no longer engages over the at least one suspension hook or the at least two suspension hooks of the at least one scaffolding floor, the anti-lift-off body maintains its spacing from or height relative to the transverse wall so that the displacement along the U profile in the displacement direction to over the succeeding suspension hook of the at least one scaffolding floor or a succeeding suspension hook of a further scaffolding floor next following in the displacement direction, particularly through tilting or tipping down of the anti-lift-out body in the direction of the U profile, is not blocked. 
     According to the invention the aforesaid object is fulfilled in the case of a method of the aforesaid kind, particularly according to claim  14 , in that during performance of the second method step an anti-lift-out and support body, which includes the anti-lift-out body, which extends in the direction of the anti-lift-out body longitudinal axis thereof, preferably parallel to the U-section beam longitudinal axis of the U-section beam, and a support body, which is fixedly or rigidly connected—particularly by welding—with the anti-lift-out body and extends transversely or perpendicularly away from the anti-lift-out body up to its support body end, is so arranged that the support body end of the support body is supported on the transverse wall of the U-section beam, and—preferably subsequently—the locking body is inserted by means of or by way of the fastening body in the direction of the fastening body longitudinal axis thereof as well as transversely or perpendicularly to the longitudinal axis of the guiding and fastening groove through a passage opening of the anti-lift-out body of the anti-lift-out and support body and subsequently is inserted by means of or by way of the fastening body in the direction of the fastening body longitudinal axis thereof as well as transversely or perpendicularly to the longitudinal axis of the guiding and fastening groove through the longitudinal slot into the guiding and fastening groove, wherein then the locking body is disposed in its unlocking setting, after which the locking body by means of or by way of the fastening body, is rotated about the fastening body longitudinal axis thereof relative to the U profile into its locking setting. 
     According to a particularly advantageous variant of the method it can be provided that during performance of the second method step the support body of the anti-lift-out and support body is inserted by its support body end in a direction transverse or perpendicular to the longitudinal axis of the guiding and fastening groove through the longitudinal slot into the guiding and fastening groove, after which the support body penetrating the guiding and fastening groove transversely or perpendicularly to the longitudinal axis thereof is supported by its support body end on the transverse wall of the U section beam. The support body is thus not inserted or pushed into the guiding and fastening groove. This means a significant simplification of assembly. 
     The following optional measures relate not only to possible developments or variants of the scaffolding according to the invention, but also to possible developments or variants of the method according to the invention. 
     According to an advantageous development it can be provided that the anti-lift-out and support body, which is supported by the support body end of its support body on the transverse wall of the U-section beam, is matched in configuration to the suspension hook or hooks, which rests or rest on the first support edge of the support edges of the support limbs of the U profile, of the at least one scaffolding floor and on the U profile of the U-section beam in such a way that the suspension hooks of the at least one scaffolding floor and consequently the at least one scaffolding floor are movable relative to the U profile of the U-section beam or displaceable in the U-section beam longitudinal direction thereof and that, depending of the selected fastening device and on the fastening thereof, the anti-lift-out and support body is displaceable relative to the U profile and thus also relative to the suspension hook or hooks in the U-section beam longitudinal direction. An even greater flexibility of assembly thereby results. 
     According to a particularly preferred development it can be provided that a gap is formed between the anti-lift-out body of the anti-lift-out and support body and the suspension hook or hooks, which is or are engaged over by the anti-lift-out body, of the at least one scaffolding floor. As a result, not only the suspension hook or hooks of the at least one scaffolding floor, but also the anti-lift-out and support body can be displaced along the U-section beam. This means an even greater flexibility of assembly. Even if in the case of this embodiment the anti-lift-out and locking body is secured against displacement along the U profile or clamped fast to the U-section beam or the U profile thereof, the suspension hook or the suspension hooks of the at least one scaffolding floor is or are displaceable along the U profile. 
     According to a particularly preferred development it can be provided that the transverse wall of the U-section beam has a guide groove, which is open towards the locking space of the guiding and fastening groove and which extends in a guide groove longitudinal direction parallel to the longitudinal axis of the guiding and fastening groove, and that the support body is supported by its support body end on a groove base of the guide groove of the transverse wall of the U-section beam. As a result, an even better and still more secure load introduction of any loads acting on the anti-lift-out body of the anti-lift-out and support body and particularly good guidance during or for displacement of the anti-lift-out and support body along the U-section beam is possible. 
     The foregoing advantages can be achieved to a particular degree if, as considered in a direction perpendicular to the longitudinal centre plane of the U profile, the guide groove has a minimum guide groove width which is only slightly larger than a maximum width of the support body end of the support body. 
     According to a development it can be provided that the U-section beam is formed symmetrically with respect to a longitudinal centre plane which includes the longitudinal centre plane of the U profile. As a result, further assembly advantages can be achieved. 
     According to a development it can be provided that the U-section beam has a box-shaped elongate hollow profile which in cross-section is cross-sectionally closed substantially rectangularly. As a result, the stability of the U-section beam can be increased for the same reduced weight, whereby further assembly advantages are achievable. 
     According to a development it can be provided that the hollow profile is formed by the transverse wall and by a lower wall, which bounds a base of the hollow profile, as well as by two outer walls, which respectively extend perpendicularly away therefrom and in the direction of the transverse wall as well as parallelly to one another and which extend parallel to the support limbs—which are preferably bounded by planar or flat-plane outer surfaces—of the U profile of the U-section beam and the preferably planar or flat-plane outer surfaces thereof align with the preferably planar or flat-plane outer surfaces of the support limbs. As a result, quite special assembly advantages and a further increased assembly flexibility with respect to scaffolding components, which can be supported on or fastened to the U-section beam, can be achieved. 
     In that case it can be provided that the hollow profile as considered in a direction perpendicular to the longitudinal centre plane of the U profile has a hollow profile width and, as considered perpendicularly to this direction, a hollow profile length which is very much larger than the hollow profile width and/or that the U-section beam as considered in a direction perpendicular to the longitudinal centre plane of its U profile has a U-section beam width and as considered perpendicularly to this direction has a U-section beam length which is very much larger than the U-section beam width. 
     According to a preferred development it can be provided that the fastening body and the locking body are integrally connected or that the fastening body and the locking body are produced from one piece, particularly by forging. Assembly capability and reliability can thereby be improved. 
     According to a development it can be provided in accordance with a first alternative that the fastening device is a clamping-fast device comprising a screw-and-nut locking unit in which a screw and a nut are screwed together and the fastening body is a first threaded body (screw or nut) with a first thread, which is screwed together with a second thread of the securing body, which is formed as a second threaded body (nut or screw). This makes possible—particularly in those cases in which the anti-lift-out and support body is to be arranged to lie outwardly with respect to a U-section beam end of the U-section beam or with respect to at least one adjacently arranged further anti-lift-out device, particularly in the region of one of the U-section beam ends of the U-section beam—clamping fast of the anti-lift-out and support body to the U-section beam without additional measures having to be undertaken. As a result, not only can scaffolding floors be mounted on the U-section beam right up to the U-section beam ends thereof, but also auxiliary components such as, for example, post connectors for connection and support of scaffolding posts to and on the U-section beam, beam connectors for flexible direct or indirect supporting and/or fastening of the U-section beam and hanging means for hanging the U-section beam. 
     In that case it can be provided that the anti-lift-out and support body is so detachably screw-connected by means of the screw-and-nut locking unit of the clamping-fast device with the U-section beam that the anti-lift-out and support body is not displaceable relative to the U-section beam in the direction of the U-section beam longitudinal axis thereof. As a result, the foregoing advantages can be realised to a particular degree. 
     Particularly when the fastening device is the clamping-fast device it can be provided that the locking body is constructed as a groove block or hammer head. In that case it can be provided that the locking body is rounded at least at two diametrically opposite edges or at its locking body ends facing away from one another. As a result, on the one hand rotation of the locking body about the fastening body longitudinal axis can be made possible and on the other hand the angle of rotation can be limited by bearing of the two other edges of the locking body in the locking setting, which corresponds with a rotation of approximately 90 degrees, against groove walls of the guiding and fastening groove. 
     The locking body, particularly the clamping-fast device, can preferably be of block-shaped form. 
     According to a development it can be provided in accordance with a second alternative that the fastening device is a quick-action locking device comprising a securing element locking unit with a securing element, which unit embraces or engages around the securing body and is fastened to a fastening body end—which faces away from the locking body—of the fastening body to be pivotable about a transverse axis, which extends transversely or perpendicularly to the fastening body longitudinal axis, from at least one manipulation setting into a securing setting relative to the anti-lift-out and support body, in which securing setting the securing element and consequently the fastening body pivotably fastened thereto and the locking body fastened thereto are secured against unintended rotation about the fastening body longitudinal axis from the locking setting of the locking body into the unlocking setting of the locking body. As a result, a particularly simple and rapid locking or unlocking of the anti-lift-out device at the U-section beam and securing of the suspension hook or suspension hooks against lifting out of the U profile can be realised and at the same time there are particularly advantageous possibilities for the purpose of displacing the suspension hook or suspension hooks and/or the anti-lift-out and support body along the U-section beam. This signifies particularly flexible assembly possibilities, especially with respect to scaffolding components able to be fastened to or supported on the U-section beam. 
     In that case, according to a development it can be provided that the securing element in its at least one manipulation setting can be designed or serve for manual rotation of the locking body about the fastening body longitudinal axis from its locking setting to its unlocking setting and conversely. When the locking body is in its unlocking setting, the securing element in its at least one manipulation setting can be configured or serve for manual withdrawal of the locking body together with the fastening body from the guiding and fastening groove and from the passage opening of the anti-lift-out body. When the locking body is in its unlocking setting, the securing element in its at least one manipulation setting can be configured or serve for manual insertion and penetration of the locking body together with the fastening body into and through the passage opening of the anti-lift-out body as well as for insertion of the locking body into the guiding and fastening groove. 
     According to a particularly preferred development it can be provided that the anti-lift-out and support body is detachably fastened by means of the quick-action locking device to the U-section beam in such a way that the anti-lift-out and support body at least in the at least one manipulation setting of the securing element or in both the at least one manipulation setting of the securing element and the securing setting of the securing element or in all pivot settings in which the securing element in the mounted state of the quick-action locking device is pivotable about the transverse axis relative to the anti-lift-out and support body, is displaceable in a displacement direction parallel to the U-section beam longitudinal axis relative to the U-section beam. These measures make possible an even greater degree of assembly flexibility. 
     According to a development it can be provided that the securing body and the locking body as considered in the direction of the fastening body longitudinal axis are substantially not movable or displaceable or are substantially not movable or displaceable relative to one another. As a result, an easy displacement, which has low susceptibility to jamming or is free of jamming, of the anti-lift-out device along the U-section beam is made possible or ensured. 
     According to a preferred development it can be provided that the locking body, which extends along the locking body longitudinal axis thereof, of the quick-action locking device is convexly rounded substantially overall or is outwardly curved substantially overall. This makes possible even easier displacement, which is free of jamming, of the anti-lift-out device along the U-section beam. 
     According to a development it can be provided that the locking body, which extends along the locking body longitudinal axis thereof, of the quick-action locking device has locking body ends which extend from the fastening body in opposite directions, preferably parallelly to one another, wherein a concavely rounded or inwardly curved transition region is formed between each locking body end of the locking body ends and the fastening body. This makes possible even easier displacement, which is free of jamming, of the anti-lift-out device along the U-section beam. 
     According to a particularly preferred development it can be provided that the fastening body, which extends along the fastening body longitudinal axis thereof, of the quick-action locking device is formed in a length region between the locking body and the securing body with a preferably sword-shaped or blade-shaped flat web extending in a direction along or parallel to the anti-lift-out body longitudinal axis. This makes possible even easier displacement, which is free of jamming, of the anti-lift-out device along the U-section beam. 
     The flat web can have, preferably over its entire flat web length or height, as considered in a notional plane perpendicular to the fastening body longitudinal axis and as considered in a direction perpendicular to the anti-lift-out body longitudinal axis, a maximum thickness and, as considered in a direction parallel to the anti-lift-out body longitudinal axis, a maximum width which is, in particular, at least twice or at least three times larger than the maximum thickness of the flat web. Consequently, the guidance and displacement relationships can be still further improved. 
     According to a development it can be provided that the flat web in the length region has over its entire flattest length convexly rounded edges or over its outer circumference is formed to be outwardly curved and/or in a notional sectional plane perpendicular to the fastening body longitudinal axis has an elliptical flat-web cross-section. The guidance and displaceability relationships can thereby be even further improved. 
     According to a development it can be provided that the maximum thickness of the fastening body in its length region is smaller than a minimum spacing of the suspension hooks, which are laid on the first support edge of a first support limb of the support limbs of the U profile, of the at least one scaffolding floor from further suspension hooks, which are opposite the suspension hooks and are arranged at an end of at least one further scaffolding floor and which are laid on the second support edge of a second support limb of the support limbs of the U profile. It is thereby possible to displace the anti-lift-out device together with its fastening body along the U-section beam without collision with the suspension hooks of the scaffolding floor. 
     According to a preferred development it can be provided that the securing body of the quick-action locking device extends in a direction parallel to the locking body longitudinal axis. As a result, a particularly high degree of security against lifting out of the suspension hook or the suspension hooks can be achieved and in addition manipulation as well as securing of the quick-action locking device can thereby be improved. 
     According to a development it can be provided that the securing element of the quick-action locking device consists of or is forged from a metal sheet. In the first case, cost-saving effects and a low weight can be achieved. In the second case, the stability of the securing element can be increased. 
     According to a development it can be provided that the securing element of the quick-action locking device comprises a plate-shaped section for support on a surface, which faces away from the support body end of the support body, of the anti-lift-out body. This enables simplified manipulation, reduced costs and a reduced weight. 
     According to a preferred development it can be provided that the securing element, preferably the plate-shaped section, has a grip opening for the gripping of at least one finger or for the gripping of at least two fingers of a hand of an assembler, wherein the grip opening is bounded at a securing element end, which faces away from the securing body, by a web. Consequently, the assembler can grip and actuate the securing element at least in its manipulation setting by one hand in such a way that the assembler grips by at least one finger of his or her hand through the grip opening or that the assembler grips by at least two fingers of his or her hand through the grip opening. 
     According to a particularly preferred development it can be provided that the securing element or the plate-shaped section of the securing element has, preferably at a or at the securing element end facing away from the securing body, an anti-twist body which in the securing setting of the securing flap releasably engages in a securing recess or securing passage of the anti-lift-out body. As a result, there is made possible, by particularly simple and economic means, an especially simple and secure locking of the securing element and thus the locking of the locking body against unintended rotation of the locking body. 
     According to an advantageous development it can be provided that the securing element or the plate-shaped section of the securing element has at a or the first securing element end facing away from the securing body at least one actuating limb for manual pivotation of the securing element from its locking setting into its at least one manipulation setting. Simplified and improved manual manipulation can thereby be achieved. 
     According to a development it can be provided that the anti-twist body is flanged or bent away from the metal sheet in a first direction, wherein the anti-twist body extends in the recess or in the passage of the anti-lift-out body when the securing plate bears on the anti-lift-out body. As a result, production costs can be reduced and locking security further increased. 
     According to a development it can be provided that the actuating limb is flanged or bent away from the metal sheet in a second direction, preferably away from the anti-twist body, wherein the actuating limb extends obliquely, particularly upwardly, away from the anti-lift-out body when the securing plate bears on the anti-lift-out body. Production costs can thereby be further reduced and manipulation further improved. 
     According to a preferred development it can be provided that at least one bearing body, preferably at least one pin or at least one bearing dowel, is fastened to the fastening body end, which faces away from the locking body, of the fastening body, which bearing body has bearing body ends which extend away from the fastening body in opposite directions, preferably parallelly to one another, and define or include a or the transverse axle at or on which the securing element is mounted to be pivotable about the transverse axis. As a result, it can be achieved in simple mode and manner that the securing element is captively connected with the fastening body, in particular, is easily and reliably pivotable. 
     According to a development it can be provided that formed at the plate-shaped section of the metal sheet of the securing element at its second securing element end associated with the securing body are two fastening and bearing straps which are bent over from the plate-shaped section of the metal sheet and of which each fastening and bearing strap engages around a bearing body end of the bearing body ends so that the securing element is captively connected by way of the bearing body ends with the fastening body and is pivotable about the transverse axis of the bearing body ends. Consequently, the aforesaid advantages can be realised in a special way. 
     The securing element locking unit can be a securing lever locking unit and/or a securing flap locking unit. The securing element can be a securing lever and/or a securing flap. The securing element can consist of steel, particularly of galvanised steel or of forged steel. 
     According to a preferred development it can be provided that the support body of the anti-lift-out and support body as considered in a direction perpendicular to the anti-lift-out securing body longitudinal axis is arranged in the region or in the transverse centre of the anti-lift-out body and extends transversely or perpendicularly away from the anti-lift-out body. The displaceability, the spectrum of use and the flexibility of assembly can thereby be further improved. 
     According to a development it can be provided that the anti-lift-out body of the anti-lift-out and securing body is constructed as an anti-lift-out plate or anti-lift-out metal sheet and/or that the support body of the anti-lift-out and support body is constructed as a support plate or as a support metal sheet. As a result, particularly advantageous space and stability relationships can be achieved with reduced costs. 
     According to a particularly preferred development it can be provided that the anti-lift-out and support body has a T profile cross-section in a notional plane perpendicular to the anti-lift-out body longitudinal axis or that the anti-lift-out and support body is designed as a T profile formed from the anti-lift-out body and the support body or with a T profile formed from the anti-lift-out body and the support body and/or that the anti-lift-out and support body as considered in the direction of the anti-lift-out body longitudinal axis has a respective T profile cross-section, at least at those places at which the support body and the anti-lift-out body are connected together, in a notional plane perpendicular to the anti-lift-out body longitudinal axis. The aforesaid advantages can thereby be further enhanced. 
     According to a preferred development it can be provided that the anti-lift-out and support body is constructed symmetrically with respect to a longitudinal centre plane containing the anti-lift-out body longitudinal axis. The displaceability, spectrum of use and the flexibility of assembly can thereby be further improved and at the same time even more advantageous space and stability relationships can be achieved with further reduced costs. 
     According to a particularly preferred development it can be provided that the support body end of the support body has a first spacing from an outer surface, which faces away therefrom, of the anti-lift-out body, and the securing body as considered in a direction parallel to the fastening body longitudinal axis has a second spacing—which is greater, preferably only slightly, than the first spacing—from locking surfaces, which are opposite the securing body, of the locking body. As a result, the anti-lift-out and support body is displaceable along the U-section beam when this is permitted by the fastening device. 
     According to a preferred development it can be provided that the anti-lift-out and support body comprises a plurality of support bodies, which are respectively fixedly or rigidly connected with the anti-lift-out body and respectively extend transversely or perpendicularly away from the anti-lift-out body and which as considered in a direction parallel to the anti-lift-out body longitudinal axis are aligned with one another and as considered in the direction of the anti-lift-out body longitudinal axis have a or a respective mutual support body spacing preferably of the same size. Further advantageous possibilities for displacement, which is free of jamming, of the locking body of the anti-lift-out device and consequently of the anti-lift-out device along the U-section beam are thereby provided and at the same time weight can be saved. 
     In that case, according to a preferred development it can be provided that the support body respectively extends transversely or perpendicularly away from the anti-lift-out body up to a support body end of the respective support body and is supported by its respective support body end on the transverse wall or on the base groove of the guide groove of the transverse wall of the U-section beam. 
     According to a development it can be provided that as considered in the direction of the anti-lift-out body longitudinal axis the or each support body spacing corresponds, in particular substantially or approximately, with a maximum length of the or each passage opening. The aforesaid advantages can thereby be further improved. 
     According to an advantageous development it can be provided that the support limbs of the U profile as considered in a direction perpendicular to the longitudinal centre plane thereof have a mutual support limb spacing and that the anti-lift-out body as considered in a direction perpendicular to the longitudinal centre plane  60  of the anti-lift-out and support body has a maximum anti-lift-out body width which is smaller than the support limb spacing of the support limbs. As a result, accessory parts such as one or more suspension shoes for supporting or suspending the U-section beam and/or one or more post adaptors for connection of one or more scaffolding posts to the U-section beam to the U-section beam can be fastened without problems to the U-section beam, notwithstanding the mounted anti-lift-out device, in length regions where no suspension hooks are arranged. 
     According to a development it can be provided that the anti-lift-out and support body is formed as an elongate rail extending in the direction of the anti-lift-out body longitudinal axis. Consequently, as considered in the direction of the U-section beam longitudinal axis several mutually adjacent scaffolding floors can be secured particularly simply and securely by means of one and the same anti-lift-out and support body against lifting of the suspension hooks thereof out of the U profile. 
     According to a particularly preferred development it can be provided that the anti-lift-out and support body is secured by means of a first fastening device and by means of a second fastening device to the U-section beam against lifting of the suspension hook or the suspension hooks of the at least one scaffolding floor out of the U profile of the U-section beam, wherein the first fastening device and the second fastening device as considered in the direction of the U-section beam longitudinal axis of the U-section beam are arranged at a mutual spacing, and the first fastening device is the clamping-fast device and the second fastening device is the quick-action locking device or the first fastening device is the clamping-fast device and the second fastening device is a corresponding or the same clamping-fast device or the first device is the quick-action locking device and the second fastening device is a corresponding or the same quick-action locking device, and the anti-lift-out body has a number—which corresponds with the number of fastening devices—of passage openings which are each formed in a such a way that the respective locking body together with a fastening body part of the respective fastening body is insertable in the direction of the fastening body longitudinal axis thereof as well as perpendicularly to the longitudinal axis of the fastening groove through the respective passage opening. By virtue of these measures, particularly flexible possibilities for securing the anti-lift-out device to the U-section beam can be achieved, whereby assembly flexibility can be still further improved. 
     It will be obvious that the aforesaid measures can be combined with one another as desired within the scope of feasibility. 
     Further aspects, features and advantages of the invention can be inferred from the following description part in which preferred embodiments of the invention are described on the basis of the drawings, in which: 
    
    
     
         FIG.  1    shows a hanging scaffolding with two U-section beams with outwardly and upwardly open U profiles in which suspension hooks of scaffolding floors are suspended, which are secured by means of anti-lift-out devices according to the invention against lifting out of the respective U profile; 
         FIG.  2    shows a perspective view of a U-section beam of the two U-section beams shown in  FIG.  1   ; 
         FIG.  3    shows a cross-section of the U-section beam according to  FIG.  2   ; 
         FIG.  4    shows a perspective part view of the hanging scaffolding in the region of the suspension, which is illustrated at the front right in  FIG.  1   , with a suspension shoe, through which one of the U-section beams extends; 
         FIG.  5    shows an arrangement of scaffolding components with illustration of the cross-section of the U-section beam, in the U profile of which for illustrative reasons two scaffolding floors are suspended, wherein the suspension hooks thereof are secured by means of an anti-lift-out device according to the invention against lifting out, which in accordance with a first alternative solution includes a fastening device formed as a clamping-fast device; 
         FIG.  6    shows the arrangement according to  FIG.  5    in a view, which is turned relative thereto through 90 degrees, in a longitudinal section; 
         FIG.  7    shows a cross-sectional view according to  FIG.  5    with detached screw connection; 
         FIG.  8    shows an arrangement of scaffolding components with illustration of the cross section of the U-section beam, in the U profile of which for illustrative reasons again two scaffolding floors are suspended, wherein the suspension hooks thereof are secured by means of an anti-lift-out device according to the invention against lifting out, which in accordance with second alternative solution includes a fastening device, which is formed as a quick-action locking device, with a securing flap disposed in its securing setting; 
         FIG.  9    shows the arrangement according to  FIG.  8    in a view, which is turned relative thereto through 90 degrees, in a longitudinal section; 
         FIG.  10    shows a cross-section view according to  FIG.  8   , wherein the securing flap is now disposed in an upwardly pivoted manipulation setting and wherein the locking body is disposed in an unlocking setting; 
         FIG.  11    shows a perspective illustration of an anti-lift-out and support body according to the invention of the anti-lift-out device according to the invention; 
         FIG.  12 . 1    shows a cross-section of the anti-lift-out and support body according to  FIG.  11   ; 
         FIG.  12 . 2    shows a side view of the anti-lift-out and support body according to  FIG.  11   ; 
         FIG.  12 . 3    shows a plan view of the anti-lift-out and support body according to  FIG.  11   ; 
         FIG.  13    shows a perspective illustration of the fastening device configured as a clamping-fast device 
         FIG.  14 . 1    shows a cross-section of the clamping-fast device according to  FIG.  13   ; 
         FIG.  14 . 2    shows a side view of the clamping-fast device according to  FIG.  13   ; 
         FIG.  14 . 3    shows a plan view of the clamping-fast device according to  FIG.  13   ; 
         FIG.  15    shows a perspective illustration of the fastening device configured as a quick-action locking device; 
         FIG.  16 . 1    shows a cross-section of the quick-action locking device according to  FIG.  15   ; 
         FIG.  16 . 2    shows a side view of the quick-action locking device according to  FIG.  15   ; 
         FIG.  16 . 3    shows a plan view of the quick-action locking device according to  FIG.  15   ; 
         FIG.  17    shows a perspective part view in the region of an end-face end of the U-section beam with illustration of a method step relating to assembly of the quick-action locking device for forming an arrangement according to  FIGS.  8  to  10   , wherein the anti-lift-out and support body for illustrative reasons protrudes partly beyond the end-face end of the U-section beam; 
         FIG.  18    shows a perspective view according to  FIG.  17   , wherein now the quick-action locking device has been transferred to an assembly setting in which a locking and thus anti-lift-out securing by means of its locking body is made possible and in which the securing flap is pivoted from its manipulation setting shown in  FIG.  17    in the direction of its securing setting shown in  FIGS.  9  and  19   ; and 
         FIG.  19    shows a perspective view according to  FIGS.  17  and  18   , wherein now the anti-lift-out and support body is illustrated in an intended installation setting and the securing flap is now pivoted into its securing setting. 
     
    
    
       FIG.  1    shows scaffolding  20 , which can be hung as hanging scaffolding at constructions (not shown), for example at a bridge (not shown). For this purpose, at least two hanging devices  21 . 1 ,  21 . 2  are provided. Each hanging device  21 . 1 ,  21 . 2  comprises a support device  22 , which is preferably to be arranged vertically, and a fastening device  23 , which is detachably fastened thereto, for detachable fastening of a respective U-section beam  24 . 1 ,  24 . 2 . In the illustrated embodiment the two U-section beams  24 . 1 ,  24 . 2  are of the same configuration. Accordingly, the reference number  24  is used uniformly in the following for U-section beams. The fastening device  23  is a suspension shoe (see also  FIG.  3   ). Each support device  22  comprises a threaded rod  25 , which is to be detachably fastened to the construction (not shown) by its upper threaded rod end  26  facing away from the suspension shoe  23 . A similar support device has become known from DE 10 2016 103 224 A1. Each suspension shoe  23  comprises a plurality of metal plates, which are preferably welded together and, in particular, a support plate  27  for the laying-on of the associated U-section beam  24 . 1 ,  24 . 2 , a first trapezium-shaped side plate  28 . 1  for lateral support of the associated U-section beam  24  and a second trapezium-shaped side plate  28 . 2  for lateral support of the associated U-section beam  24 , which are respectively fastened in the region of their wider trapezium side thereof to the support plate  27  and which respectively extend perpendicularly thereto and parallelly away from one another, as well as a support plate  29 , which is respectively fastened to the two trapezium-shaped side plates  28 . 1 ,  28 . 2  in the region of the narrow trapezium side thereof. The support plate  27 , the two side plates  28 . 1 ,  28 . 2  and the support plate  29  include a receiving space  30 , which is rectangular in cross-section, for releasable reception of the associated U-section beam  24 . Each U-section beam  24  is supported on the support plate  27  of the associated receiving shoe  23 . Each U-section beam  24  can, for positioning, be displaced relative to the associated suspension shoe  23  as long as the latter is not yet fastened to the associated U-section beam  24  by way of fastening means. 
     Two U-section beams  24  which extend parallelly and at a transverse spacing from one another are shown in  FIG.  1   . Each U-section beam  24  is a beam of aluminium produced in an extrusion method. This can also be termed extruded aluminium U-section beam. Each U-section beam  24  extends as an elongate profile member rectilinearly in a direction parallel to the U-section beam longitudinal axis  34  thereof. In the illustrated embodiment, the two U-section beams  24  have the same U-section beam length of, for example, approximately 4 metres or approximately 5 metres or approximately 6 metres or approximately 7 metres. However, it will be understood that the U-section beam can also have a different U-section beam length. In particular, each U-section beam  24  has the same cross-section in a notional section plane perpendicular to the U-section beam longitudinal axis  34  thereof (see  FIG.  3   ). The U-section beams  24  can be connected by means of longitudinal connectors (not shown) with one or more further corresponding U-section beams (similarly not shown) so as to achieve a desired or necessary span width. 
     Each U-section beam  24  comprises a plate-shaped lower wall  35  and two plate-shaped side walls  36 . 1 ,  36 . 2 , which extend perpendicularly away therefrom in the same direction and which extend parallelly to one another at a transverse spacing  37  corresponding with the width of the lower wall  35 . The transverse spacing corresponds with the width, which for example is 52 millimetres, of the U-section beam  24 . The lower wall  35  and the two side walls  36 . 1 ,  36 . 2  are outer walls of the U-section beam  24 . The outer surfaces of the side walls  36 . 1 ,  36 . 2  and of the lower wall  35  are formed to be substantially planar. A transverse wall  38 , which extends transversely to the two side walls  36 . 1 ,  36 . 2  therebetween, is formed at a spacing, which is very much larger than the width of the lower wall, from the lower wall  35 . Each side wall  36 . 1 ,  36 . 2  is provided with a plurality of preferably circularly round fastening holes  39  for the fastening of the suspension shoe  23  and of further accessory parts, particularly of the connection adapters  40 —which are shown in  FIG.  1   —for detachable connection of further scaffolding components such as scaffolding posts and/or scaffolding rails. The fastening holes  39  are arranged in two parallel longitudinal rows  41 . 1 ,  41 . 2 , which are arranged at a height spacing  42  from one another. The fastening holes  39  respectively have, as considered in the direction of the respective longitudinal row  41 . 1 ,  41 . 2 , the same hole spacing  43  from one another. The same number of fastening holes  39  is provided in each longitudinal row  41 . 1 ,  41 . 2 . For preference, all fastening holes  39  are of the same form. 
     Each U-section beam  24  comprises a box-shaped, cross-sectionally closed elongate cavity profile member  45  which is substantially rectangular in cross-section and the cavity  69  of which is bounded by the lower wall  35 , which bounds a base of the cavity profile member  45 , by the two side walls  36 . 1 ,  36 . 2  and by the transverse wall  38 . The cavity profile member  45  of each U-section beam  24  has, as considered in a direction perpendicular to the longitudinal centre plane  46  thereof, a cavity profile member width  47  and, perpendicularly to this direction as considered in a notional section plane formed perpendicularly to the longitudinal centre plane  46 , a cavity profile member height  48  which is very much larger than the cavity profile member width  47 . 
     Each U-section beam  24  has at its side opposite the lower wall  35  a U profile  31 . Each U profile  31  is formed by the respective transverse wall  38  and by two support limbs  33 . 1 ,  33 . 2 , which are arranged parallel to one another and parallel to the longitudinal centre plane  49  of the U profile  31 . Each side wall  36 . 1 ,  36 . 2  goes over at the outside in alignment into the associated support limb  33 . 1 ,  33 . 2 , which prolongs the respective side wall  36 . 1 ,  36 . 2 . Each support limb  33 . 1 ,  33 . 2  has an outer surface which is formed to be substantially planar and which is aligned with the outer surface of the associated side wall  36 . 1 ,  36 . 2 . Each U-section beam  24  is formed symmetrically with respect to the longitudinal centre plane  46  thereof, which includes the longitudinal centre plane  49  of the respective U profile  31 . Each U-section beam has a U-section beam height  112  of, for example, 280 millimetres. 
     Each U-section beam  24  has a guiding and fastening groove  51 , which is bounded by the respective transverse wall  38  and is open in the direction of the support edges  50 . 1 ,  50 . 2  of the support limbs  33 . 1 ,  33 . 2  as well as towards the inner sides thereof and which extends in a transverse direction transversely to the support limbs  33 . 1 ,  33 . 2  and in a longitudinal direction perpendicularly to the transverse direction in the direction of its longitudinal axis  52  parallelly to the U-section beam longitudinal axis  34  of the U-section beam  24 . The guiding and fastening groove  51  is bounded by groove engagement-behind webs  53 . 1 ,  53 . 2 , which are arranged at the same height along the inner sides of the two support limbs  33 . 1 ,  33 . 2  and which extend out from the support limbs  33 . 1 ,  33 . 2  respectively inwardly towards one another. A longitudinal slot  55  of, for example, 16 millimetres width is formed between the mutually opposite ends  54 . 1 ,  54 . 2  of the groove engagement-behind webs  53 . 1 ,  53 . 2 . The groove engagement-behind webs  53 . 1 ,  53 . 2  bound a locking space  56  of the guiding and fastening groove  51 , in which a locking body  74 . 1 ,  74 . 2  can be releasably arranged at a plurality of positions along the guiding and fastening groove  51 . The guiding and fastening groove  51  and the longitudinal slot  55  extend in the longitudinal direction of the U-section beam  24  parallelly to the U-section beam longitudinal axis  34  thereof continuously over the entire U-section beam length. The U profile  31  of each U-section beam  24  is formed symmetrically with respect to its longitudinal centre plane  46  containing the U-section beam longitudinal axis  34 . 
     The transverse wall  38  of the respective U-section beam  24  has a guide groove  58 , which is open towards the locking space  56  of the guiding and fastening groove  51 , for at least one support body  59 . 1 ,  59 . 2 ,  59 . 3  of an anti-lift-out and support body  60  according to the invention. The guide groove  58  extends in a guide groove longitudinal direction parallel to the longitudinal axis  52  of the guiding and fastening groove  51  continuously over the entire U-section beam length of the U-section beam  24 . The guide groove  58  has the same guide groove spacing from the outer surfaces of the U-section beam  24 . The longitudinal centre plane  61  of the guide groove  58  coincides with the longitudinal centre plane  49  of the U profile  31 . The groove base  62  of the guide groove  58  is bounded by a transverse wall part  63 , which extends in the interior of the cavity profile member  45  of the U-section beam  24 , of the transverse wall  38 . 
     At each U-section beam  24  auxiliary components such as, for example, the connection adapters  40  for connection and support of scaffolding posts and of scaffolding bars, such as transverse bars, longitudinal bars and diagonals, are selectably releasably fixed to the respective U-section beam  24  by way of fastening means such as bolts  64 . These bolts  64  are respectively plugged through two mutually aligned fastening holes  39  of the fastening holes  39  provided in the side walls  36 . 1 ,  36 . 2  of the U-section beam  24  concerned. Scaffolding posts, particularly of modular scaffolding, to which further scaffolding components, particularly longitudinal bars, transverse bars and diagonals, can be directly or indirectly fastened, are releasably fastened to the connector adapters  40 , as shown in  FIG.  1   . 
     With the object of being flexible for the respective local conditions, particularly with respect to height relationships and inclinations, at least one beam connecting device  65  can be selectably detachably fastened to a or each U-section beam  24 . The at least one beam connection device  65  can be selectably connected in accordance with a first alternative, which is shown in  FIG.  1   , to a scaffolding post with use of a scaffolding tube, which is detachably fastened to the U-section beam  24  by means of at least one connection adapter  40 . According to a second alternative (not shown), the support connection device can be selectably detachably fastened directly to the U-section beam. Through selection of the fastening holes  39  for the bolting together, the mounting conditions of the U-section beam  24  can be realised as flexible or as stiff in bending, as well as the height position of the U-section beam  24  varied, although to a smaller extent than in the case of the said first alternative. Thus, beam connection devices  65  for flexible direct or indirect support and/or fastening of the respective U-section beam  24  at or to the construction (not shown) can be selectably fastened, preferably detachably, to the U-section beams  24 . 
     Scaffolding floors  44 , which are adjacent to one another at the longitudinal side and extend perpendicularly to the U-section beams  24 , are suspended by their suspension hooks  32  in the outwardly and upwardly open U profiles  31  of the U-section beams  24  extending at a transverse spacing parallelly to one another. The suspension hooks  32 , which in the embodiment are respectively designed as so-called U-claws, are fastened to the narrow ends  66  of the scaffolding floors  44 , preferably by welding. By contrast to so-called O-claws, which are designed and intended for suspension in O profiles such as scaffolding tubes having a round cross-section, U-claws  32  are designed and intended for suspension in U profiles, particularly in the U profiles  31 . In the illustrated embodiment, two suspension hooks  32  are arranged at a transverse spacing from one another at each narrow end  66  of each scaffolding floor  44 . Each suspension hook  32  as considered in a direction away from the respective walk and work surface of the associated scaffolding floor  44 , thus in installation setting, is open downwardly as well as towards its two sides. 
     It will be obvious that it is also possible for three or more parallel U-section beams  24  to be provided, which can be arranged at a transverse spacing from one another. Then in the U-profile  31  of at least one U-section beam  24 —which as considered in transverse direction is arranged to be inwardly disposed between two other parallel U-section beams, thus as considered in transverse direction—further scaffolding floors can be suspended by their suspension hooks  32  in such a way that the suspension hooks  32  of scaffolding floors  44 , which extend away from one another transversely or perpendicularly from the inwardly disposed U-section beam  24 , rest on two support limbs  33 . 1 ,  33 . 2  of the U profile  31  of this inwardly disposed U-section beam  24 , as illustrated in, for example,  FIGS.  5 ,  7 ,  8  and  10   . 
     At least one suspension hook  32  of the suspension hooks  32  or several or all suspension hooks  32  of the suspension hooks  32  are secured by means of several anti-lift-out devices  70 . 1 ,  70 . 2  according to the invention against lifting out of the respective U profile  31  of the respective U-section beam  24 , thus against being unhooked in upward direction. The anti-lift-out devices  70 . 1 ,  70 . 2  are detachably fastened to the U-section beam  24 . 
     Each anti-lift-out device  70 . 1 ,  70 . 2  preferably includes at least two fastening devices  71 . 1 ,  71 . 2  and an anti-lift-out and support body  60 . Each fastening device  71 . 1 ,  71 . 2  comprises a fastening body  73 . 1 ,  73 . 2 , a locking body  74 . 1 ,  74 . 2  and a securing body  75 . 1 ,  75 . 2 . The respective rod-shaped fastening body  73 . 1 ,  73 . 2  extends in the direction of the fastening body longitudinal axis  76 . 1 ,  76 . 2  thereof. Each locking body  74 . 1 ,  74 . 2  extends in the direction of its locking body longitudinal axis  77 . 1 ,  77 . 2  perpendicularly to the fastening body longitudinal axis  76 . 1 ,  76 . 2  of the respective fastening body  73 . 1 ,  73 . 2 . Each locking body  74 . 1 ,  74 . 2  is rigidly connected with the associated fastening body  73 . 1 ,  73 . 2 . The respective securing body  75 . 1 ,  75 . 2  is arranged at the respective fastening body  73 . 1 ,  73 . 2  at a spacing  78 . 1 ,  78 . 2  from the respective locking body  74 . 1 ,  74 . 2 . The securing body  75 . 2  extends transversely or perpendicularly to the fastening body longitudinal axis  76 . 2  of the fastening body  73 . 2 . 
     According to the invention the anti-lift-out body  67  extending in the direction of the anti-lift-out body longitudinal axis  68  thereof is a component of an anti-lift-out and support body  60 . The latter is shown particularly in  FIGS.  11 ,  12 . 1 ,  12 . 2  and  12 . 3   . The anti-lift-out and support body  60  extends rectilinearly in a direction parallel to the anti-lift-out body longitudinal axis  68  of its anti-lift-out body  67 . The anti-lift-out and support body  60  is formed as an elongate rail. The anti-lift-out and support body  60  comprises at least one, preferably three, support bodies  59 . 1 ,  59 . 2 ,  59 . 3 , respectively rigidly connected, particularly by welding, with the anti-lift-out body  67 . The or each support body  59 . 1 ,  59 . 2 ,  59 . 3  extends along the anti-lift-out body  67  parallelly to the anti-lift-out body longitudinal axis  68 . The or each support body  59 . 1 ,  59 . 2 ,  59 . 3  extends perpendicularly away from the anti-lift-out body  67  or from the anti-lift-out body longitudinal axis  68  thereof up to a or a respective at least one, support body end  79 . 1 ,  79 . 2 . 1 ,  79 . 2 . 2 ,  79 . 2 . 3 ,  79 . 3 . As considered in a direction parallel to the anti-lift-out body longitudinal axis  68  the support bodies  59 . 1 ,  59 . 2 ,  59 . 3  are in alignment with one another. As considered in the direction of the anti-lift-out body longitudinal axis  68  the support bodies  59 . 1 ,  59 . 2 ,  59 . 3  each have a mutual support body spacing  80 . 1 ,  80 . 2  of, for example, 40 millimetres. The anti-lift-out body  67  has two identical, preferably rectangular, passage openings  81 . 1 ,  81 . 2  each for a respective a fastening device  71 . 1 ,  71 . 2  according to the invention for detachable fastening of the anti-lift-out and support body  60  to the U-section beam  24 . As considered in the direction of the anti-lift-out body longitudinal axis  68  these passage openings  81 . 1 ,  81 . 2  have a longitudinal spacing from one another. As considered in the direction of the anti-lift-out body longitudinal axis  68  each support body spacing  80 . 1 ,  80 . 2  corresponds with a maximum length of the respective passage opening  81 . 1 ,  81 . 2  of the anti-lift-out body  67 . Each support body  59 . 1 ,  59 . 2 ,  59 . 3  is supported by its support body end or by its support body ends  79 . 1 ,  79 . 2 . 1 ,  79 . 2 . 2 ,  79 . 2 . 3 ,  79 . 3  on the groove base  62  of the guide groove  58  of the transverse wall  38  of the U-section beam  24 . Each support body end  79 . 1 ,  79 . 2 . 1 ,  79 . 2 . 2 ,  79 . 2 . 3 ,  79 . 3  of the respective support body  59 . 1 ,  59 . 2 ,  59 . 3  or each support body  59 . 1 ,  59 . 2 ,  59 . 3  has a maximum width  57  which is slightly smaller than a minimum guide groove width  72  of the guide groove  58  of the transverse wall  38 . 
     The anti-lift-out and support body  60  supported by the support body ends  79 . 1 ,  79 . 2 . 1 ,  79 . 2 . 2 ,  79 . 2 . 3 ,  79 . 3  of its support body  59 . 1 ,  59 . 2 ,  59 . 3  on the groove base  62  of the guide groove  58  of the transverse wall  38  of the U-section beam  24  is so adapted in configuration to the suspension hook or hooks  32 , which rests or rest on at least one support edge  50 . 1 ,  50 . 2  of the support edges  50 . 1 ,  50 . 2  of the support limbs  33 . 1 ,  33 . 2  of the U profile  31  of the U section beam  24  or on the support edges  50 . 1 ,  50 . 2  of the support limbs  33 . 1 ,  33 . 2  of the U profile  31  of the U-section beam  24 , and to the U profile  31  of the U-section beam  24  that the suspension hook or hooks  32  and consequently the associated scaffolding floor  44  or associated scaffolding floors  44  is or are displaceable relative to the U profile  31  of the U-section beam  24  longitudinally of the U-section beam  24 . 
     The anti-lift-out and support body  60  is formed symmetrically with respect to a notional transverse centre plane  142 , which is formed perpendicularly to the anti-lift-out body longitudinal axis  68 . The anti-lift-out and support body  60  is formed symmetrically with respect to a longitudinal centre plane  143  containing the anti-lift-out body longitudinal axis  68 . 
     The anti-lift-out and support body  60  has a length of preferably 1 metre. This length corresponds with the anti-lift-out body length of the anti-lift-out body  67 . If the scaffolding floors  44  have, for example, a usual width of, for example, 0.32 metres, up to 3 scaffolding floors  44  disposed adjacent to one another at the longitudinal sides can be secured by an anti-lift-out and support body  60 , which has a length of approximately 1 metre, against lifting of its suspension hooks out of the U profile  31  of the U-section beam  24 . In practice, preferably several of the anti-lift-out and support bodies  6  are mounted directly one behind the other or directly in succession in longitudinal direction on a U-section beam  24 . The anti-lift-out body  67  has an anti-lift-out body width  82  of preferably 50 millimetres. The anti-lift-out and support body  60  has a height  83  of preferably approximately 70 millimetres. 
     Each support body  59 . 1 ,  59 . 2 ,  59 . 3  of the anti-lift-out and support body  60  as considered in a direction perpendicular to the anti-lift out body longitudinal axis  68  is arranged in the transverse centre  84  of the anti-lift-out body  67  and extends perpendicularly away from the anti-lift out body  67 . Each support body  59 . 1 ,  59 . 2 ,  59 . 3  of each anti-lift-out and support body  60  is constructed as a support plate or support metal sheet. Each support body  59 . 1 ,  59 . 2 ,  59 . 3  has a support body wall thickness  85  of preferably 4 millimetres. The anti-lift-out body  67  of the anti-lift-out and support body  60  is constructed as an anti-lift-out plate or anti-lift-out metal sheet. The anti-lift-out body  67  has an anti-lift-out body wall thickness  86  of preferably 4 millimetres. 
     The anti-lift-out and support body  60  consists of preferably galvanised steel. The anti-lift-out and support body  60  as considered in the direction of the anti-lift-out body longitudinal axis  68  has at those places at which the respective support body  59 . 1 ,  59 . 2 ,  59 . 3  and the anti-lift-out body  67  are connected together a respective T profile cross-section  87  and, in particular, as considered in each instance in a notional section plane perpendicular to the anti-lift-out body longitudinal axis  68 . 
     Each support body end  79 . 1 ,  79 . 2 . 1 ,  79 . 2 . 2 ,  79 . 2 . 3 ,  79 . 3 , which is intended for support on the groove base  62  of the guide groove of the transverse wall  38  of the U-section beam  24 , of the respective support body  59 . 1 ,  59 . 2 ,  59 . 3  has a first spacing  89  from an outer surface  88 , which faces away therefrom, of the anti-lift-out body  67  and the securing body  75 . 2  as considered in a direction parallel to the fastening body longitudinal axis  76 . 2  has a second spacing  91 , which is only slightly larger than the first spacing  89 , from locking surfaces  90 . 2  opposite thereto of the locking body  74 . 2 . 
     The anti-lift-out body  67  as considered in a direction perpendicular to the longitudinal centre plane  60  of the anti-lift-out and support body has a maximum anti-lift-out body width  82  and the support limbs  33 . 1 ,  33 . 2  of the U profile  31  as considered in a direction perpendicular to its longitudinal centre plane  49  have a mutual support limb spacing  92  which is larger than the anti-lift-out body width  82 . As a result, accessory parts such as the suspension shoes  23  for support or suspension of the U-section beam and the connection adapters  40  notwithstanding the mounted anti-lift-out device  70 . 1 ,  70 . 2  can be fastened without problem to the U-section beam  24  in longitudinal regions at least where no suspension hooks  32  of the scaffolding floor  44  are arranged. 
     The anti-lift-out and support body  60  as considered in the direction of the U-section beam longitudinal axis  34  can be laid in any longitudinal position on the U-section beam  24 , i.e. supported by its support bodies  59 . 1 ,  59 . 2 ,  59 . 3  on the groove base  62  of the guide groove  58  of the transverse wall  38  of the U-section beam  24 , and secured against lifting out by means of a fastening device  71 . 1 ,  71 . 2  according to the invention or by means of several fastening devices  71 . 1 ,  71 . 2  according to the invention. Notwithstanding the mounted lift-off securing means, mounting of accessory parts is still possible. 
     In the mounted state, in which the support body ends  79 . 1 ,  79 . 2 . 1 ,  79 . 2 . 2 ,  79 . 2 . 3 ,  79 . 3  of the support bodies  59 . 1 ,  59 . 2 ,  59 . 3  of the anti-lift-out and support body  60  are supported on the groove base  62  of the guide groove  58  of the transverse wall  38  of the U-section beam  24 , a respective fastening body  73 . 1 ,  73 . 2  of the respective fastening device  71 . 1 ,  71 . 2  is inserted through each passage opening  81 . 1 ,  81 . 2  of the anti-lift-out body  67  of the anti-lift-out and support body  60  and, in particular, is respectively rotatable about its fastening body longitudinal axis  76 . 1 ,  76 . 2  relative to the anti-lift-out body  67 . According to the invention each passage opening  81 . 1 ,  81 . 2  of the anti-lift-out body  61  is formed in such a way that the respective locking body  74 . 1 ,  74 . 2  is movable by means of or by way of the associated fastening body  73 . 1 ,  73 . 2  in the direction of the fastening body longitudinal axis  76 . 1 ,  76 . 2  thereof, as well as transversely or perpendicularly to the longitudinal axis  52  of the guiding and fastening groove  51 , through the associated passage opening  81 . 1 ,  81 . 2  of the anti-lift-out body  67 . 
     In the mounted state, in which the support body ends  79 . 1 ,  79 . 2 . 1 ,  79 . 2 . 2 ,  79 . 2 . 3 ,  79 . 3  of the support bodies  59 . 1 ,  59 . 2 ,  59 . 3  of the anti-lift-out and support body  67  are supported on the groove base  62  of the guide groove  58  of the transverse wall  38  of the U-section beam  24  a displacement gap  93  is formed between the anti-lift-out body  67  of the anti-lift-out and support body  60  and the suspension hook or hooks  32 , over which the anti-lift-out body  67  is engaged, of the at least one scaffolding floor  44 . 
     In the secured mounted state, in which the support body ends  79 . 1 ,  79 . 2 . 1 ,  79 . 2 . 2 ,  79 . 2 . 3 ,  79 . 3  of the support bodies  59 . 1 ,  59 . 2 ,  59 . 3  of the anti-lift-out and support body  60  are supported on the groove base  62  of the guide groove  58  of the transverse wall  38  of the U-section beam  24  and in which the respective locking body  74 . 1 ,  74 . 2  is in its respective locking setting  97 . 1 ,  97 . 2 , each anti-lift-out and support body  60  is secured by means of at least two fastening devices  71 . 1 ,  71 . 2  to the U-section beam  24  against lifting of the suspension hooks  32  of the at least one scaffolding floor  44  or several scaffolding floors  44  out of the U profile  31  of the U-section beam  24 . The fastening bodies  73 . 1 ,  73 . 2  of the fastening devices  71 . 1 ,  71 . 2  or the fastening devices  71 . 1 ,  71 . 2  as considered in the direction of the U-section beam longitudinal axis  34  of the U-section beam  24  are arranged at a spacing  94  from one another. The fastening devices  71 . 1 ,  71 . 2  can be of the same or different configuration particularly according to the longitudinal position in which the respective anti-lift-out and support body  60  is to be detachably fastened or is detachably fastened to the U-section beam  24 . 
     Particularly when the relevant anti-lift-out and support body  60  is mounted to lie outwardly on the U-section beam  24 , thus in the region of a U-section beam end  95 . 1 ,  95 . 2  of the mutually remote U-section beam ends  95 . 1 ,  95 . 2  of the U-section beam  24 , and/or when the relevant anti-lift-out and support body  60  is mounted at a U-section beam end  95 . 1 ,  95 . 2  of the mutually remote U-section beam ends  95 . 1 ,  95 . 2  of the U-section beam  24  of the succeeding anti-lift-out and support body  40 , one of the at least two fastening devices  71 . 1  can be a clamping-fast device  96 . 1  or the at least two fastening devices  71 . 1 ,  71 . 1  can each be a clamping-fast device  96 . 1 ,  96 . 1 , by means of which or by way of which the anti-lift-out and support body  60  is clamped fast, preferably by screw connection, to the U-section beam  24  when the or the respective locking body  74 . 1 ,  74 . 1  is in its locking setting  97 . 1 ,  97 . 1 , so that the anti-lift-out and support body  60  cannot be displaced relative to the U-section beam  24  at least longitudinally thereof. 
     It will be obvious that even when the relevant anti-lift-out and support body  60  is mounted inwardly at the U-section beam  24 , thus at least one respective further anti-lift-out and support body  60  is mounted at both ends, which is clamped fast in such a way to the U-section beam  24 —either with the help of at least one fastening device  71 . 1  constructed as a clamping-fast device  96 . 1  or with the help of at least two fastening devices  71 . 1 ,  71 . 1  each constructed as a respective clamping-fast device  96 . 1 —that the at least one further anti-lift-out and support body  60  is not displaceable relative to the U-section beam  24  longitudinally thereof, at least one of the at least two fastening devices can be configured as a clamping-fast device or the at least two fastening devices can be each configured as a clamping-fast device. 
     However, when the relevant anti-lift-out and support body  60  is mounted inwardly at the U-section beam  24 , it can preferably be provided that at least one of the at least two fastening devices  71 . 2  is a quick-action locking device  96 . 2  or the at least two fastening devices  71 . 2 ,  71 . 2  are each a respective quick-action locking device  96 . 2 , by means of which the anti-lift-out and support body  60 , when the respective locking body  74 . 2  of the quick-action locking device  96 . 2  is in its respective locking setting  97 . 2 , can be displaced along the U-section beam  24  relative thereto. As a result, the anti-lift-out and support body  60  can be positioned particularly flexibly, wherein at the same time it constantly secures the suspension hooks  32 , over which its anti-lift-out body  67  is engaged, against lifting out of the U profile  31  of the U-section beam  24 . 
     The or each quick-action locking device  96 . 2  is distinguished particularly by the fact that by comparison with the clamping-fast device  96 . 1  a particularly simple and rapid locking or unlocking of the anti-lift-out device  70 . 2  to or from the U-section beam  24  is possible and a particularly advantageous securing of the suspension hook  322  or of the suspension hooks  32  against lifting out of the U profile  31  can be realised. At the same time, there are equally particularly advantageous possibilities of being able to displace the suspension hook  32  or the suspension hooks  32  and/or the anti-lift-out and support body  60  along the U-section beam  24 . This signifies particularly flexible mounting possibilities, particularly with respect to scaffolding components fastenable to or supportable on the U-section beam  24 . The securing of the suspension hooks  32  against lifting out functions, in the case of inwardly disposed anti-lift-out and support bodies  60 , by means of locking through a rotational movement of the preferably two fastening devices  71 . 2 , which are configured as quick-action locking devices  96 . 2 . If at least one outwardly disposed anti-lift-out and support body  60 , which is clamped fast to the U-section beam  24 , is directly connected in each instance by means of at least one fastening device  71 . 1 , which is formed as a clamping-fast device  96 . 1 , with one or several inwardly disposed anti-lift-out and support bodies  60  towards the outside, thus as considered in the direction of the two U-section beam ends  95 . 1 ,  95 . 2  of the U-section beam  24 , the inwardly disposed anti-lift-out and support body  60  or the inwardly disposed anti-lift out and support bodies  60  do not have to be secured against longitudinal displacement along the U-section beam  24 . If the two outwardly disposed anti-lift-out and support bodies  60  are each clamped fast to the U-section beam  24  by means of at least one fastening device  71 . 1  formed as a clamping-fast device  96 . 1 , the inwardly disposed anti-lift-out and support body  60  directly connected inwardly in longitudinal direction or the inwardly disposed anti-lift-out and support bodies  60  directly connected inwardly in longitudinal direction can no longer be displaced relative to the U-section beam  24  longitudinally thereof. Thus, as securing of each inwardly disposed anti-lift-out and support body  60  against longitudinal displacement it is sufficient if as considered in direction of the U-section beam ends  95 . 1 ,  95 . 2  of the U-section beam  24  a respective anti-lift-out and support body  60  directly connected with the outermost anti-lift-out and support body  60  is clamped fast to the U-section beam  24  by means of at least one fastening device  71 . 1  formed as a clamping-fast device  96 . 1 . 
     A clamping-fast device  96 . 1  according to the invention is shown in, in particular,  FIGS.  13 ,  14 . 1 ,  14 . 2  and  14 . 3   . The clamping-fast device  96 . 1  comprises a screw-and-nut locking unit  100 , in which a screw  101  and a nut  102  are screwed together. The fastening body  73 . 1  of the clamping-fast device  96 . 1  is a first threaded body, here a screw  101 , with a first thread  103 , which is screwed together with a second thread  104  of the securing body  75 . 1  constructed as a second threaded body, here the nut. In the mounted and secured state, the anti-lift-out and support body  60  is detachably screw-connected by means of the screw-and-nut locking unit  100  of the clamping-fast device  96 . 1  to the U-section beam  24  in such a way that the anti-lift-out and support body  60  is not displaceable at least relative to the U-section beam  24  in the direction of the U-section beam longitudinal axis  34  thereof or along the U-section beam  24 . The fastening body  73 . 1  of the clamping-fast device  96 . 1  is rigidly connected with the locking body  74 . 1 , which is configured as a groove block or hammer head. This locking body  74 . 1  is comparatively strongly radiused at two diametrically opposite vertical edges  105 . 1 ,  105 . 3 , whereas the two other diametrically opposite vertical edges  105 . 2 ,  105 . 4  are not radiused or not radiused in the relevant manner. As a result, on the one hand rotation of this locking body  74 . 1  about the fastening body longitudinal axis  76 . 1  in the guiding and fastening groove  51  of the U-section beam  24  from its locking setting  97 . 1  into an unlocking setting  98 . 1  is possible and on the other hand the angle of rotation can be limited by bearing of the two other vertical edges  105 . 2 ,  105 . 4  of this locking body  74 . 1  against the groove walls of the guiding and fastening groove  51  in the locking setting  97 . 1 , corresponding with rotation through approximately 90 degrees. The locking body  74 . 1  of the clamping-fast device  96 . 1  has a locking body width  106 . 1  and a locking body length  107 . 1  which are very much larger than the locking body width  106 . 1 . The locking body  74 . 1  of the clamping-fast device  96 . 1  extends along its locking body longitudinal axis  77 . 1 . It has two mutually remote locking body ends  117 . 1 ,  117 . 2  by which it extends perpendicularly to the fastening body longitudinal axis  76 . 1  of the fastening body  73 . 1  in opposite directions away therefrom. The fastening body  73 . 1  of the clamping-fast device  96 . 1  is a cylinder screw  101  which has an external thread  103  at least in the region of its screw end facing away from the locking body  74 . 1 . The securing body  75 . 1 , which is formed as a hexagonal nut, is screwed by its internal thread  104  onto the external thread  103 . A washer  109  is received on the shank  108  of the screw  101  between the locking body  74 . 1  and the nut  102 . By way of this washer  109  the securing body  75 . 1 , which is constructed as a nut, in the intended mounted state on the U-section beam  24  secures the suspension hook or hooks  32  of one or more scaffolding floors  44  against lifting out of the U profile  31  of the U-section beam  24 . The fastening body  73 . 1  and the locking body  71 . 1  of the clamping-fast device  96 . 1  consist of, preferably, galvanised steel. The fastening body  73 . 1  and the locking body  71 . 1  of the clamping-fast device  96  are preferably produced from one piece. 
     A quick-action locking device  96 . 2  according to the invention is shown in, in particular,  FIGS.  15 ,  16 . 1 ,  16 . 2  and  16 . 3   . The quick-action locking device  96 . 2  comprises, as securing element locking unit, a securing flap locking unit  110  which as securing element comprises a securing flap  111 , which comprises a securing body  112 . This securing body  112  extends in a direction parallel to the locking body longitudinal axis  77 . 2  of the locking body  74 . 2  of the quick-action locking device  96 . 2 . The securing flap  111  is fastened to a fastening body end  113 , which faces away from the locking body  74 . 2 , of the fastening body  73 . 2  of the quick-action locking device  96 . 2  to be rotatable about a transverse axis  114 , which extends perpendicularly to the fastening body longitudinal axis  73 . 2  of this fastening body  73 . 2 , starting from a plurality of possible manipulation settings  115 . 1 ,  115 . 2  into a securing setting  116  relative to the anti-lift-out and support body  60 . The securing flap  111  is rotatable about the transverse axis  114  through an angle of more than 180 degrees relative to the fastening body longitudinal axis  76 . 2  of the fastening body  73 . 2 . In the securing setting  116  of the securing flap  111 , this and consequently the fastening body  73 . 2  pivotably fastened thereto and therewith the locking body  74 . 2  fastened thereto, are secured against unintended rotation about the fastening body longitudinal axis  76 . 2  from the locking setting  97 . 2  of this locking body  74 . 2  into its unlocking setting  98 . 2 , as shown in  FIG.  8    and, in particular, in  FIG.  9   . The securing flap  111  in at least one of its manipulation settings  115 . 1 ,  115 . 2  can serve for manual rotation of the locking body  74 . 2  of the quick-action locking device  96 . 2  about the fastening body longitudinal axis  76 . 2  from its locking setting  97 . 2  into its unlocking setting  98 . 2  and vice versa. If the locking body  74 . 2  is in its unlocking setting  98 . 2 , the securing flap  111  in its at least one manipulation setting  115 . 1 ,  115 . 2  can serve the purpose of manually withdrawing the locking body  74 . 2  together with the fastening body  73 . 2  of the quick-action locking device  96 . 2  from the guiding and fastening groove  51  of the U-section beam  24  and from the associated passage opening  81 . 1 ,  81 . 2  of the associated anti-lift-out body  67 . When the locking body  74 . 2  of the quick-action locking device  96 . 2  is in its unlocking setting  98 . 2 , which by its orientation corresponds with its insertion setting  99 . 2 , the securing flap  111  in its at least one manipulation setting  115 . 1 ,  115 . 2  can serve for manual insertion and penetration of the locking body  74 . 2  together with a fastening body part of the fastening body  73 . 2  of the quick-action locking device  96 . 2  into and through a passage opening  81 . 1 ,  81 . 2  of the passage openings  81 . 1 ,  81 . 2  of the associated anti-lift-out body  67  as well as for insertion of the locking body  74 . 2  into the guiding and fastening groove  51  of the U-section beam  24  (see  FIGS.  10  and  17   ). The fastening body  73 . 2  and the locking body  74 . 2  of the quick-action locking device  96 . 2  consist of, preferably forged, steel. For preference, the fastening body  73 . 2  and the locking body  74 . 2  of the quick-action locking device  96 . 2  are produced from one piece. 
     In the embodiments shown in  FIGS.  7 ,  6  and  19    the anti-lift-out and support body  60  is detachably fastened by means of the quick-action locking device  96 . 2  to the U-section beam  24  in such a way that the anti-lift-out and support body  60  is displaceable relative to the U-section beam  24  in a displacement direction parallel to the U-section beam longitudinal axis  34  and, in particular, in all pivotation settings in which the securing flap  111  is rotatable relative to the anti-lift-out and support body  60  about the transverse axis  114 . The securing body  112  of the quick-action locking device  96 . 2  and the locking body  74 . 2  of the quick-action locking device  96 . 2  as considered in the direction of the fastening body longitudinal axis  76 . 2  are substantially not movable relative to one another or are not movable relative to one another. 
     The locking body  74 . 2 , which extends along the locking body longitudinal axis  77 . 2  thereof, of the quick-action locking device  96 . 2  is convexly rounded substantially overall or formed to be outwardly curved substantially overall. The locking body  74 . 2  of the quick-action locking device  96 . 2  has a locking body width  106 . 2  and a locking body length  107 . 1  which is very much larger than the locking body width  106 . 2 . The locking body  74 . 2  of the quick-action locking device  96 . 2  extends along the locking body longitudinal axis  77 . 2  thereof. It has two mutually remote locking body ends  118 . 1 ,  118 . 2 , by which it extends perpendicularly to the fastening body longitudinal axis  76 . 2  of the fastening body  73 . 2  away therefrom in opposite directions. A concavely rounded or inwardly curved transition region  119 . 1 ,  119 . 2  is formed between each locking body end  118 . 1 ,  118 . 2  of the locking body ends  118 . 1 ,  118 . 2  and the fastening body  73 . 2  of the quick-action locking device  96 . 2 . 
     The fastening body  73 . 2  of the quick-action locking device  96 . 2  extends along the fastening body longitudinal axis  76 . 2  thereof. This fastening body  73 . 2  is formed with a preferably sword-shaped or blade-shaped flat web  121  in a height region  120  formed between the locking body  74 . 2  of the quick-action locking device  96 . 2  and the securing body  112  of the quick-action locking device  96 . 2 . The flat web  121  extends by its flat web longitudinal axis  122  parallel to the anti-lift-out body longitudinal axis  68 . The flat web  121  has over its entire flat web height  123 , as considered in a notional plane perpendicular to the fastening body longitudinal axis  76 . 2  and in a direction perpendicular to the anti-lift-out body longitudinal axis  68 , a maximum thickness  125  and has, in the same notional plane and as considered in a direction parallel to the anti-lift-out body longitudinal axis  68 , a maximum width  124  which is very much larger than the maximum thickness  125  of the flat web  121 . In the illustrated embodiment the maximum width  124  is more than three times larger than the maximum thickness  125  of the flat web  121 . The flat web  121  has, in the said height region  120  over its entire flat web height  123 , convexly rounded edges or is formed to be outwardly curved in the said height region  120  over its entire flat web height  123  around its outer circumference. In the said height region  120  the flat web  121  has, over its entire flat web height  123 , an elliptical flat-web cross-section in a notional section plane perpendicular to the fastening body longitudinal axis  76 . 2 . The maximum thickness  125  of the flat web  121  in the height region  120  is smaller than a minimum spacing  127  from mutually opposite suspension hooks  32  of two scaffolding floors  44 , which are arranged with the narrow end faces  66  opposite and the suspension hooks  32  of which are laid on the support edges  50 . 1 ,  50 . 2  of the support limbs  33 . 1 ,  33 . 2  of the U profile  31  of the U-section beam  24  (see  FIG.  8   ). It is thereby possible to displace the or the respective anti-lift-out device  70 . 2  by the flat web  121  of its fastening body  73 . 2  along the U-section beam  24  without collision with the said suspension hooks  32  of the scaffolding floors  44 . 
     The securing flap  111  of the quick-action locking device  96 . 2  consists of a metal plate  128 . The securing flap  111  consists of preferably galvanised steel. However, it can also consist of forged steel. The securing flap  111  has a plate-shaped section  129  for resting on an outer surface  88 , which faces away from the support body ends  79 . 1 ,  79 . 2 . 1 ,  79 . 2 . 2 ,  79 . 2 . 3 ,  79 . 3  of the support bodies  59 . 1 ,  59 . 2 ,  59 . 3  of the anti-lift-out and support body  60 , of the anti-lift-out body  67 . A grip opening  131  for the gripping of at least one finger or the gripping of at least two fingers of a hand of an assembler (not shown) is provided in the plate-shaped section  129 . The grip opening  131  is bounded at a securing flap end  132 . 1 , which faces away from the securing body  112 , by a web  133 . The plate-shaped section  129  of the securing flap  111  has an anti-twist body  134  at its securing flap end  132 . 1  facing away from the securing body  112  of the securing flap. The anti-twist body  134  in the securing setting  116  of the securing flap  111  engages in a securing passage  135  of the anti-lift-out body  67  so that then a securing of the securing flap  111  against unintended rotation of the locking body  74 . 2  of the quick-action locking device  96 . 2  is achieved (see  FIG.  9   ). The plate-shaped section  129  of the securing flap  111  has at its first securing flap end  132 . 1 , which faces away from the securing body  112 , at least one actuating limb  136 . 1 ,  136 . 2  for manual pivotation of the securing flap  111  from its securing setting  116  into its at least one manipulation setting  115 . 1 ,  115 . 2 . The anti-twist body  134  is flanged or bent over from the metal plate  128  in a first direction  137 . 1 . If the securing plate  111  in its securing setting  116  rests on the said outer surface  88  of the anti-lift-out body  67  of the anti-lift-out and support body  60  the anti-twist body  134  extends in the securing passage  135  of the anti-lift-out body  67 . The at least one actuating limb  136 . 1 ,  136 . 2  is flanged over or bent over from the metal plate  128  of the securing flap  111  in a second direction  137 . 2  away from the anti-twist body  134 . If the securing plate  111  in its securing setting  116  rests on the said outer surface  88  of the anti-lift-out body  67  of the anti-lift-out and support body  60  the at least one actuating limb  136 . 1 ,  136 . 2  extends obliquely upwardly away from the anti-lift-out body  67 . 
     A bearing body  138  formed as a bearing dowel pin is fastened by clamping in a passage bore of the fastening body  73 . 2  at the fastening body end  113 , which faces away from the locking body  74 . 2 , of the fastening body  72 . 2  of the quick-action locking device  96 . 2 . The bearing body  138  has two bearing body ends  140 . 1 ,  140 . 2  which extend parallelly to one another in opposite directions away from the fastening body  73 . 2 . The bearing body  138  contains or forms the transverse axis  114  about which the securing flap  111  is mounted to be rotatable. Two fastening and bearing straps  141 . 1 ,  141 . 2  are formed at the plate-shaped section  129  of the metal plate  128  of the securing flap  111  at its second securing flap end  132 . 2  associated with the securing body  112 , which straps are bent around or flanged over from the plate-shaped section  129  of the metal plate  128  and each engage around a respective bearing body end  140 . 1 ,  140 . 2  of the bearing body ends  140 . 1 ,  140 . 2  of the bearing body  138 . The securing flap  111 , which is rotatable about the transverse axis  114 , is thereby captively connected with the fastening body  73 . 2  of the quick-action locking device  96 . 2   
     In  FIGS.  5  and  6    there is shown an arrangement of the scaffolding components with illustration of the cross-section of the U-section beam  24 , in the U profile  31  of which for reasons of illustration two scaffolding floors  44  are suspended, wherein the suspension hooks  32  thereof are secured by means of a first anti-lift-out device  70 . 1  according to the invention against lifting out. According to a first alternative solution this first anti-lift-out device  70 . 1  comprises a clamping-fast device  96 . 1 . The clamping-fast device  96 . 1  has already been described in the foregoing and is shown in, in particular,  FIGS.  13 ,  14 . 1 ,  14 . 2  and  14 . 3   . In  FIG.  5   , the locking body  74 . 1  of the clamping-fast device  96 . 1  is shown in a locking setting  97 . 1  in which it engages behind the groove engagement-behind webs  53 . 1 ,  53 . 2  of the guiding and fastening groove  51  of the U-section beam  24  and in which it is detachably fastened in the locking space  56  of the guiding and fastening groove  51 . The fastening body  73 . 1 , which is formed as a screw  101 , is inserted through a passage opening  81 . 1  of the anti-lift-out body  67  so as to be rotatable about its fastening body longitudinal axis  76 . 1  relative to the anti-lift-out body  67 . The anti-lift-out and support body  60 , which is supported by the support body ends  79 . 1 ,  79 . 2 . 1 ,  79 . 2 . 2 ,  79 . 2 . 3 ,  79 . 3  of its support body  59 . 1 ,  59 . 2 ,  59 . 3  on the groove base of the guide groove  58  of the transverse wall  38  of the U-section beam  24 , engages over the suspension hooks of the scaffolding floors  44 , wherein the anti-lift-out body  67  secures by means of the securing body  75 . 1 , which is formed as a nut, by way of the washer  109 , the fastening body  73 . 1  and the locking body  74 . 1 , thus via the washer  109 , the fastening body  73 . 1  formed as a screw  101  and the locking body  74 . 1  rigidly fastened thereto, the suspension hooks  32  of the scaffolding floors  44  against lifting upwardly or in a vertical direction or in a direction perpendicular to the U-section beam longitudinal axis  34  out of the U profile  31  of the U-section beam  24 . 
     Starting from the locking setting  97 . 1  shown in  FIG.  5   , the locking body  74 . 1  is rotatable by means of the fastening body  73 . 1 , which is formed as the screw  101 , of the clamping-fast device  96 . 1  about the fastening body longitudinal axis  76 . 1  into an unlocking setting  98 . 1 , which is shown in  FIG.  7   . In this unlocking setting  98 . 1  the locking body  74 . 1  can be moved, by means of or by way of the fastening body  73 . 1 , which is formed as the screw  101 , in a direction perpendicular to the longitudinal axis  52  of the guiding and fastening groove  51  away from the transverse wall  38  of the U-section beam  24  out of the guiding and fastening groove  51  through the longitudinal slot  55 . 
     An arrangement of scaffolding components with illustration of the cross-section of the U-section beam  24 , in the U profile  31  of which again for reasons of illustration two scaffolding floors  44  are suspended, is shown in  FIGS.  8  and  9   , wherein the suspension hooks  32  thereof are secured by means of a second anti-lift-out device  70 . 2  according to the invention against lifting out. This second anti-lift-out device  70 . 2  according to a second alternative solution comprises a quick-action locking device  96 . 2 . The quick-action locking device  96 . 2  has already been described in the foregoing and is shown in, in particular,  FIGS.  15 ,  16 . 1 ,  16 . 2  and  16 . 3   . The locking body  74 . 2  of the quick-action locking device  96 . 2  is shown in  FIG.  8    in a locking setting  97 . 2  in which it engages behind the groove engagement-behind webs  53 . 1 ,  53 . 2  of the guiding and fastening groove  51  of the U-section beam  24  and in which it is detachably fastened in the locking space  56  of the guiding and fastening groove  51 . The fastening body  73 . 2  formed with the flat web  121  is inserted through a passage opening  81 . 1  of the anti-lift-out body  67  so as to be rotatable about its fastening body longitudinal axis  76 . 2  relative to the anti-lift-out body  67 . The anti-lift-out body  67 , which is supported by the support body ends  79 . 1 ,  79 . 2 . 1 ,  79 . 2 . 2 ,  79 . 2 . 3 ,  79 . 3  of its support body  59 . 1 ,  59 . 2 ,  59 . 3  on the groove base of the guide groove  58  of the transverse wall  38  of the U-section beam  24 , of the anti-lift-out and support body  60  here, too, engages over the suspension hooks  32  of the scaffolding floors  44 , wherein the anti-lift-out body  67  secures by means of the securing body  75 . 2  of the securing flap  111  by way of the fastening body  73 . 2  and the locking body  74 . 2 , thus via the fastening body  73 . 2  formed with the flat web  121  and via the locking body  74 . 2  rigidly fastened thereto, the suspension hooks  32  of the scaffolding floors  44  against lifting upwardly or in a vertical direction or in a direction perpendicular to the U-section beam longitudinal axis  34  out of the U profile  31  of the U-section beam  24 . 
     Starting from the locking setting  97 . 2  shown in  FIG.  8    the locking body  74 . 2  is rotatable by means of the fastening body  73 . 2 , which is formed with the flat web  121 , of the quick-action locking device  96 . 2  about the fastening body locking axis  76 . 2  into an unlocking setting  98 . 2 , which is shown in  FIG.  10   . In this unlocking setting  98 . 2  the locking body  74 . 2  can be moved by means of or by way of the fastening body  73 . 2 , which is formed with the flat web  121 , in a direction perpendicular to the longitudinal axis  52  of the guiding and fastening groove  51  away from the transverse wall  38  of the U-section beam  24  out of the fastening and guiding groove  51  through the longitudinal slot  55 . 
     A method for securing several scaffolding floors  44  of scaffolding  20 , which is preferably able to be hung or is hung as hanging scaffolding, against lifting of the suspension hooks  32 , which are arranged at its narrow end faces  66 , out of the U profile  31  of the U-section beam  24  is described in the following on the basis of  FIGS.  17  to  19    and with reference to  FIGS.  7  to  9   , wherein a fastening device  71 . 2  configured as a quick-action locking device  96 . 2  is used. The quick-action locking device  96 . 2  has already been described in the foregoing and is shown in  FIGS.  15 ,  16 . 1 ,  16 . 2  and  16 . 3   . 
     If it is has not taken place, initially the scaffolding floors  44  are suspended by the suspension hooks  32  thereof in the U profile  31  of the U-section beam  24  in such a way that the suspension hooks  32  thereof rest on the support edges  50 . 1 ,  50 . 2  of the two support limbs  33 . 1 ,  33 . 2  of the U profile  31  of the U-section beam  24 . In the embodiment shown in  FIGS.  17  to  19    several scaffolding floors  44  are arranged with their mutually opposite longitudinal ends, as considered in transverse direction, adjacent to one another on each side of the U profile  31  of the U-section beam  24 . In that case, the suspension hooks  32  of a first number of scaffolding floors  44  rest on the support edge  50 . 1  of a first support limb  33 . 1  of the two support limbs  33 . 1 ,  33 . 2  of the U profile  31  of the U-section beam  24  and the suspension hooks  32  of the second number of further scaffolding floors  44  rest on the support edge  50 . 2  of the second support limb  33 . 2  of the support limbs  33 . 1 ,  33 . 2  of the U profile  31  of the U-section beam  24 . In that case, the scaffolding floors  44  are arranged in such a way that in each instance two of the scaffolding floors  44 , which lie on either side of the U profile  31  of the U-section beam  24 , are disposed approximately in a straight line. 
     After suspension of the suspension hooks  32  of the scaffolding floors  44  in the U profile  31  of the U-section beam  24  an anti-lift-out and support body  60  according to the invention is mounted on the U-section beam  24  in such a way that it is supported by support body ends  79 . 1 ,  79 . 2 . 1 ,  79 . 2 . 2 ,  79 . 2 . 3 ,  79 . 3  of its support bodies  59 . 1 ,  59 . 2 ,  59 . 3  on the groove base  62  of the guide groove  58  of the transverse wall  38  of the U-section beam  24  and engages by its anti-lift-out body  67  over the associated suspension hooks  32  of the scaffolding floors  44 . For this purpose, the anti-lift-out and support body  60  is vertically inserted by its support bodies  59 . 1 ,  59 . 2 ,  59 . 3  from above vertically downwardly through between the mutually opposite suspension hooks of the scaffolding floors  44 . 
     Subsequently thereto, in the illustrated embodiment one of the fastening devices  71 . 2 , which is configured as the quick-action locking device  96 . 2 , is mounted. For this purpose, an assembler (not shown) grips the securing flap  11  by one of his or her hands, preferably in that the assembler grips by one or two of his or her fingers through the grip opening  131  of the securing flap  111 . Due to the pivotable coupling of the fastening body  73 . 2  to the securing flap  111  the fastening body  73 . 2  then hangs under gravitational force, together with the locking body  74 . 2 , vertically or perpendicularly downwards. If it has not yet taken place, the assembler then rotates—still freely holding the securing flap  111  in his or her hand—the securing flap  111  so that the locking body  74 . 2  transfers into an insertion setting  99 . 2  in which it can be inserted from above through one of the passage openings  81 . 1  of the anti-lift-out body  67  of the anti-lift-out and support body  60  (see  FIG.  17   ). Subsequently thereto the assembler, still holding the securing flap  111  freely in his or her hand, guides or inserts the locking body  74 . 2  vertically downwardly through the said passage opening  81 . 1  of the anti-lift-out body  67  of the anti-lift-out and support body  60  and continues this introduction or insertion movement vertically downwardly until the securing body  75 . 2  of the securing flap  111  rests on the outer surface  88  of the anti-lift-body  67  of the anti-lift-out and support body  60  (see  FIGS.  18  and  10   ). 
     Subsequently thereto the assembler, still holding the securing flap  111  in his or her hand, turns the securing flap  111  through an angle of approximately 90 degrees about the fastening body longitudinal axis  76 . 2  of the fastening body  73 . 2 , whereby as a consequence of the construction the locking body  74 . 2  is co-rotated at the same time through this angle about the fastening body longitudinal axis  76 . 2  (see  FIG.  18   ). The locking body  74 . 2  is then in a locking setting  97 . 2  (see  FIG.  18   ) in which it engages behind the groove engagement-behind webs  53 . 1 ,  53 . 2  of the guiding and fastening groove  51  of the U-section beam  24  (see  FIG.  8   ). 
     During that or at the same time or subsequently the assembler, still holding the securing flap  111  in his or her hand, rotates the securing flap  11  about the transverse axis  114  in direction towards the outer surface  88  of the anti-lift-out body  67  of the anti-lift-out and support body  60  until the securing flap  111  lies by the plate-shaped section  129  thereof on the said outer surface  88  of the anti-lift-out body  67  so that then a securing setting  116  of the securing flap  111  is achieved, in which its anti-twist body  134  engages in an associated securing passage  135  of the anti-lift-out body  67  (see  FIGS.  18  and  9   ). In this securing setting  116  of the securing flap  111  a securing against unintended rotation of the securing flap  111  about the fastening body longitudinal axis  76 . 2  and consequently against unintended rotation of the locking body  74 . 2  from its locking setting  97 . 2  into its unlocking setting  98 . 2  is achieved. 
     The anti-lift-out and support body  60 , even when the locking body  74 . 2  of the quick-action locking device  96 . 2  is in its locking setting  97 . 2 , is displaceable in a displacement direction parallel to the U-section beam longitudinal axis  34  relative to the U-section beam  24  or along the U-section beam  24  and, in particular, regardless of the pivot setting in which in that case the securing flap  111  is disposed relative to the fastening body or the anti-lift-out body  67 , thus, in particular, also in the securing setting  116  of the securing flap  111 . 
     REFERENCE NUMERAL LIST 
     
         
           20  scaffolding/hanging scaffolding 
           21 . 1  hanging device 
           21 . 2  hanging device 
           22  support device 
           23  fastening device/suspension shoe 
           24  U-section beam 
           24 . 1  U-section beam 
           24 . 2  U-section beam 
           25  threaded rod 
           26  threaded rod end 
           27  support plate 
           28 . 1  (first) side plate 
           28 . 2  (second) side plate 
           29  support plate 
           30  receiving space 
           31  U profile of  24   
           32  suspension hook/U-shaped claw 
           33 . 1  (first) support limb 
           33 . 2  (second) support limb 
           34  U-section beam longitudinal axis 
           35  lower wall of  24   
           36 . 1  (first) side wall of  24   
           36 . 2  (second) side wall of  24   
           37  transverse spacing/width of  24   
           38  transverse wall of  24   
           39  fastening hole 
           40  connection adapter 
           41 . 1  (first) longitudinal row 
           41 . 2  (second) longitudinal row 
           42  height spacing 
           43  hole spacing 
           44  scaffolding floor 
           45  cavity profile member of  24   
           46  longitudinal centre plane of  24   
           47  cavity profile member width 
           48  cavity profile member height 
           49  longitudinal centre plane of  31   
           50 . 1  support edge of  33 . 1   
           50 . 2  support edge of  33 . 2   
           51  guiding and fastening groove 
           52  longitudinal axis of  51   
           53 . 1  (first) groove engagement-behind web 
           53 . 2  (second) groove engagement-behind web 
           54 . 1  end of  53 . 1   
           54 . 2  end of  53 . 2   
           55  longitudinal slot 
           56  locking space 
           57  (maximum) width of  59 . 1 ,  59 . 2 ,  59 . 3   
           58  guide groove 
           59 . 1  support body 
           59 . 2  support body 
           59 . 3  support body 
           60  anti-lift-out and support body 
           61  longitudinal centre plane of  58   
           62  groove base of  58   
           63  transverse wall part of  38   
           64  fastening means/bolt 
           65  support connecting device 
           66  (narrow) end face of  44   
           67  anti-lift-out body 
           68  anti-lift-out body longitudinal axis 
           69  cavity 
           70 . 1  anti-lift-out device 
           70 . 2  anti-lift-out device 
           71 . 1  fastening device 
           71 . 2  fastening device 
           72  (minimum) guide groove width 
           73 . 1  fastening body of  71 . 1   
           73 . 2  fastening body of  71 . 2   
           74 . 1  locking body of  71 . 1   
           74 . 2  locking body of  71 . 2   
           75 . 1  securing body of  71 . 1   
           75 . 2  securing body  71 . 2   
           76 . 1  fastening body longitudinal axis of  73 . 1   
           76 . 2  fastening body longitudinal axis of  73 . 2   
           77 . 1  locking body longitudinal axis of  74 . 1   
           77 . 2  locking body longitudinal axis of  74 . 1   
           78 . 1  spacing 
           78 . 2  spacing 
           79 . 1  support body end of  59 . 1   
           79 . 2 . 1  support body end of  59 . 2   
           79 . 2 . 2  support body end of  59 . 2   
           79 . 2 . 3  support body end of  59 . 2   
           79 . 3  support body end of  59 . 3   
           80 . 1  support body spacing 
           80 . 2  support body spacing 
           81 . 1  passage opening 
           81 . 2  passage opening 
           82  (maximum) anti-lift-out body width of  67   
           83  height of  60   
           84  transverse centre of  60   
           85  support body wall thickness 
           86  anti-lift-out body wall thickness 
           87  T profile cross-section 
           88  outer area/outer surface of  60   
           89  (first) spacing 
           90 . 1  locking surface(s) of  74 . 1   
           90 . 2  locking surface(s) of  74 . 2   
           91  (second) spacing 
           92  support limb spacing 
           93  (displacement) gap 
           94  spacing 
           95 . 1  U-section beam end of  24   
           95 . 2  U-section beam end of  24   
           96 . 1  clamping-fast device 
           96 . 2  quick-action locking device 
           97 . 1  locking setting of  74 . 1   
           97 . 2  locking setting of  74 . 2   
           98 . 1  unlocking setting of  74 . 1   
           98 . 2  unlocking setting of  74 . 2   
           99 . 2  insertion setting of  74 . 2   
           100  screw-and-nut locking unit 
           101  (first) threaded body/(cylinder) screw 
           102  (second) threaded body/(hexagonal) nut 
           103  (first) (external) thread 
           104  (second) (internal) thread 
           105 . 1  radiused edge 
           105 . 2  edge 
           105 . 3  radiused edge 
           105 . 4  edge 
           106 . 1  locking body width of  74 . 1   
           106 . 2  locking body width of  74 . 2   
           107 . 1  locking body length of  74 . 1   
           107 . 2  locking body length of  74 . 2   
           108  shank of  101   
           109  washer 
           110  securing flap locking unit 
           111  securing flap 
           112  U-section beam height 
           113  fastening body end of  73 . 2   
           114  transverse axis 
           115 . 1  manipulation setting 
           115 . 2  manipulation setting 
           116  securing setting 
           117 . 1  locking body end of  74 . 1   
           117 . 2  locking body end of  74 . 1   
           118 . 1  locking body end of  74 . 2   
           118 . 2  locking body end of  74 . 2   
           119 . 1  transition region 
           119 . 2  transition region 
           120  (height) region 
           121  flat web 
           122  flat web longitudinal axis 
           123  flat web height 
           124  (maximum) width of  121   
           125  (maximum) thickness of  121   
           127  (minimum) spacing 
           128  metal plate 
           129  (plate-shaped) section 
           131  grip opening 
           132 . 1  securing flap end 
           132 . 2  securing flap end 
           133  web 
           134  anti-twist body 
           135  securing passage 
           136 . 1  actuating limb 
           136 . 2  actuating limb 
           137 . 1  (first) direction 
           137 . 2  (second) direction 
           138  bearing body/bearing dowel 
           140 . 1  bearing body end 
           140 . 2  bearing body end 
           141 . 1  fastening and bearing strap 
           141 . 2  fastening and bearing strap 
           142  transverse centre plane of  60   
           143  longitudinal centre plane of  60