Patent Publication Number: US-11655601-B2

Title: Concrete block, particularly access-denial bollard, with additional functionalities

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The invention relates to a concrete block, particularly used as a protective and anti-intrusion/access-denial device, and/or support base for functional or signposting elements, to be set up in particular temporarily on a public road or at sites of events. 
     The concrete block of the invention is not particularly intended for construction. 
     The invention will be more particularly described, without, however, being limited thereto, in regard to a use for public protection as protective and access-denial devices to be set up on the periphery of sites that are likely to receive a large number of people, such as during temporary events, to stop all vehicles attempting to get into the sites. Advantageously, the device of the invention is intended to be associated with other technical functions, such as for support and temporary arrangement of functional elements, reliably and securely, at crossings, stopping points. Without being exhaustive, the concrete block of the invention is intended to be used to support poles, posts, gateways, barriers, fences, construction fencing, electric power distribution cabinets. 
     Description of the Related Art 
     Today, protection of events or denial of entry into sites is done by arranging barriers and/or concrete blocks placed at strategic locations where there is a risk of vehicles passing through. However, the barriers do not constitute effective protective systems because they cannot withstand a vehicle passing through. 
     As for the concrete blocks of known type on public roads, although protective, they are either time-consuming to set up, in particular to be arranged temporarily at a location, because they are not equipped with any grip to offload them, to set them up, and pick them up again, or they can be moved too easily because they are in particular provided with an undercut base configured for the passage of the prongs of a forklift. 
     Certain blocks are nevertheless equipped with reinforcements forming arches that project from their upper surface to be hooked and lifted. However, these projecting arches are not completely secure and remain hand-made without any determination of mechanical strength, particularly for people passing by when these blocks are placed at crossing points. 
     SUMMARY OF THE INVENTION 
     The invention therefore has as its object to propose a concrete block, in particular with an access-denial function, which does not have the above-mentioned drawbacks, while avoiding any risk of movement that is too easy by current machines, allowing an easy placement and lifting as a result of lifting machines that are adapted and provided with non-standard hooking means, and also providing other functions such as those of base or of support for a technical apparatus that is in particular to be set up temporarily, reliably and securely. 
     By access-denial block is meant a block that has a substantial mass to be put in place and removed only by lifting machines; such a block can have in particular a mass on the order of at least 500 kg. 
     According to the invention, the concrete block has a body, preferably with a general parallelepiped shape, and anchoring means intended for the lifting of the block, and is characterized in that the anchoring means are integral with the body and mounted in blind cavities without protruding out of these cavities, in particular mounted in the area of one of the faces of the body of the block such as the upper face of the block when the block is in the set-up position on the ground, and in that the body has spaces (recesses) and/or attachment or engagement means, said spaces and the attachment/engagement means being intended for the attachment, preferably a releasable attachment, or the engagement, of technical apparatus to be engaged with the block. 
     “Without protruding out of these cavities” means the fact that the anchoring means extend from the bottom of the cavity while being at most coplanar with the plane of the outer face of the body comprising the cavities. 
     In the following description, the terms “horizontal,” “vertical,” “upper,” “lower,” “high,” “low,” “height” are used in the context of a normal set-up of the block, i.e., relative to a vertical sense in relation to a horizontal flat ground on which the block would be placed. 
     Preferably, the concrete block is a block with an access-denial function. 
     Thus, the concrete block of the invention has different functionalities added to its access-denial function. The block is manufactured and delivered ready to be set up and used, the specific spaces and/or attachment means making it possible to insert and mount technical apparatus on the block, directly on site. 
     Advantageously, the concrete block is fiber-reinforced, having reinforcement fibers in it. 
     According to a characteristic, the anchoring means are configured to work with special lifting engagement means, the anchoring means being able to work mutually only with a single type of lifting means that are specifically dedicated to the type of anchoring means, so that the anchoring means cannot work with a universal lifting/hooking system or a very common lifting system of the very common hook type. Thus, only specific, non-standard, lifting/anchoring means can lift the concrete block of the invention. Even if the blocks are on public roads, it is impossible to move them without calling for specialist third parties that have available lifting cranes equipped with specific lifting hooks/tools for working with the anchoring means of the block. By way of example, the anchoring means are in the shape of spheres or mushrooms, of the type of those marketed by the ARTEON Company. 
     According to another characteristic, the body of the block has edges that are beveled, in particular the body having a general parallelepiped shape and at least its edges referred to as vertical in the set-up position of the block and those of the upper face and optionally the edges of any surface recess being beveled. 
     According to yet another characteristic, the body of the concrete block has at least two opposite faces referred to as lower and upper, and a peripheral wall referred to as a lateral wall connecting the two opposite faces, the outer surface of the lateral wall having, preferably over its entire periphery and preferably in its middle part, a space forming a recess of the outer surface (toward the interior of the body) to make a throat, said throat being in particular intended to be used as an attachment surface. 
     According to another characteristic, the body, which has at least two opposite faces referred to as lower face and upper face, and a peripheral wall referred to as a lateral wall connecting the two opposite faces, is such that the outer surface of the lateral wall comprises at least one attachment plate as attachment means, the attachment plate being equipped with one or more attachment/engagement elements that are intended to work with at least one apparatus to be engaged with the block so as to engage at least one barrier, in particular a bar barrier of the police type or referred to as a Vauban barrier, in particular the attachment element being a bar or an element able to work by mutual engagement with the apparatus to be engaged, or the engagement element being at least a pair of guide rollers between which a barrier is intended to slide. 
     In one embodiment, the attachment element is telescopic; it is adjustable in length in a horizontal plane when the plate is attached to the block so as to make possible an adjustment of the distance that separates the block from the technical apparatus to be engaged. In particular, the attachment element has a hook that is integral with a slider that is able to be mobile in a tube by way of an adjusting screw that works with the slider whose adjusting head projects out of the tube opposite the hook. 
     Preferably, the body of the concrete block has a parallelepiped shape and the attachment plate or plates are at right angles and are secured against an angle of the parallelepiped body. 
     Advantageously, the body that has at least two opposite faces referred to as lower and upper and a peripheral wall referred to as a lateral wall connecting the two opposite faces constitutes a base/a foundation for the attachment on its upper face and/or its lateral wall of at least one technical apparatus, preferably its lower face being flat continuously from or in the proximity of one edge up to the edge or near the opposite edge. This surface continuity in the area of the lower face makes it possible not only to ensure stability to the block but especially furnishes security without the possibility of lifting from underneath using means of the forklift type. 
     The body can have, in particular on the face equipped with anchoring means, as a space, a central opening, said opening being intended to receive a pole or a post, and/or as attachment means, an attachment interface plate, and/or attachment elements of the threaded-rods type, particularly the plate or the attachment elements being intended for the attachment of at least one support leg or of a post, such as a signpost, or a lamp, or a post for an advertising panel, or a post for a gateway, preferably the post being equipped with means for adjustment in height for the apparatus working with said post. 
     The concrete block can constitute a base/a foundation for the attachment on its upper face of an electric power distribution cabinet, or of at least one support leg for the attachment to the support leg of an apparatus, such as a fence, fencing. 
     The concrete block can have hinged and foldable panels, at least one of which is attached to a lateral wall of the block, preferably the panels, in the folded position, being stored around the block, which reduces the bulk of the functional concrete block with its panels. The panels can, for example, constitute a fence in the unfolded state. 
     Advantageously, the concrete block has at least one illuminating system, particularly a reflector, in particular positioned in the lower part of the block in the set-up position of the block and able to illuminate upward, preferably able to illuminate with an illumination angle that corresponds to the two upper angles (corners) (of the upper end) of the block to identify the size of the block at night. 
     In an additional embodiment, the concrete block has at least one space in which a traffic barrier is intended to be attached, preferably a collapsible traffic barrier that is stored in the collapsed state in said space. 
     In yet another additional embodiment, the concrete block has, on the one hand, a first space that passes through the entirety of the body of the block, in particular along the entire height of the block, and that is intended to house a bar with a length that is less than that of the space, and, on the other hand, a second space constituting an access passage to the first space, the bar being intended to work with a connecting element intended to be inserted into the area of the first space by way of the second space. 
     The invention also relates to the use of at least one concrete block of the invention as an access-denial block that combines at least one other function by furnishing a base and/or a support for attachment/engagement of at least one technical apparatus such as a pole, a post, a gateway, a support leg, an electric power distribution cabinet, a signpost, a hooking bar, a barrier, fencing, a fence, an access-denial traffic barrier, and particularly use of several concrete blocks of the invention connected by connecting elements that are integrally engaged with the blocks so as to arrange a string of concrete blocks that are spaced apart and connected integrally to one another, or else use of at least two concrete blocks that are spaced apart and connected to one another by at least one traffic barrier attached to the blocks and able to be unfolded. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       This invention is now described using examples that are uniquely illustrative and in no way limiting of the scope of the invention, and from the attached illustrations, in which: 
         FIG.  1    represents a perspective view of an embodiment of the concrete block according to the invention; 
         FIG.  2    is a variant embodiment of  FIG.  1   ; 
         FIG.  3    is a view in partial perspective and from above of the block of the invention equipped with attachment means intended for the attachment of at least one technical apparatus; 
         FIGS.  4  and  5 A  are views in partial perspective and from above of a variant embodiment of the block; 
         FIG.  5 B  is an example of use of the block of  FIG.  5 A  equipped with a pole; 
         FIG.  6    is a perspective view of the block of the invention according to another variant embodiment and intended for the attachment of a connecting element; 
         FIGS.  7 A and  7 B  illustrate another example of use of the block as a support foundation for an electric power distribution cabinet, respectively with the door of the cabinet closed and open; 
         FIG.  8    shows the use of two blocks of the invention as supports of a gateway; 
         FIGS.  9  to  12    illustrate other examples of use of the block of the invention as support for technical apparatus, respectively, support for an elevated panel, support for a banner, for a signboard, and for an advertising apparatus; 
         FIG.  13 A  illustrates a perspective view of a block of the invention used to support a barrier; 
         FIG.  13 B  is a detail view of  FIG.  13 A ; 
         FIG.  13 C  is an example embodiment according to the invention of attachment means to engage an apparatus with the block; 
         FIG.  14    is a perspective view of the block of the invention showing different means of attachment; 
         FIG.  15    is an additional example of attachment means; 
         FIG.  16 A  shows a block equipped with a fence in a folded and stored state; 
         FIG.  16 B  corresponds to  FIG.  16 A  with the fence unfolded; 
         FIG.  16 C  is a diagrammatic front view of two blocks of the invention combined with a continuous fence between the two blocks; 
         FIG.  17    is a rear perspective view of a block of the invention equipped with fencing; 
         FIG.  18 A  is a partial perspective view of an example embodiment of the block of the invention with which a traffic barrier is engaged; 
         FIG.  18 B  is a diagrammatic top view of the underside of two blocks of  FIG.  18 A  that are spaced apart and connected to one another by two traffic barriers, each of the traffic barriers being folded underneath a space of each block; 
         FIG.  18 C  represents a diagrammatic view of  FIG.  18 B  in the unfolded position of the traffic barriers, the blocks having been moved. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The concrete block  1  of the invention illustrated in the figures is a solid concrete block, of substantial mass, in particular on the order of 500 kg to beyond a ton, intended primarily to constitute an access-denial block for vehicles. 
     The concrete block is preferably made of fiber-reinforced concrete. 
     According to the invention, the block  1  is provided with other technical functions, and in particular is intended to constitute a base or a support for attachment of various technical apparatus, particularly for technical apparatus that is intended to remain temporarily at a location.  FIGS.  6 A to  18 C  illustrate in a non-exhaustive manner different examples of use of the concrete block of the invention with various technical apparatus. 
     With regard to  FIGS.  1  and  2   , the concrete block  1  has a body  10  that is cylindrical and comprising a lower face  11 , an upper opposite face  12 , and a vertical peripheral lateral wall  13  connecting the two faces  11  and  12 . The base of the cylindrical body is preferably polygonal but could be round, oval . . . . According to a preferred example, the body has a parallelepiped shape with a square or rectangular base, the peripheral wall  13  comprising four vertical faces. 
     Preferably, the body  10  of the block has—on its lateral wall  13  surrounding it and in its middle part—a space  14  forming a peripheral throat. This peripheral throat  14  comprises a back  14 A that is therefore located in a plane that is parallel and offset in relation to the outer plane of the lateral wall  13 . 
     The space  14  can be used, for example, as a support for a signpost, such as a plaque  15 , the plaque being able in particular to be covered by a film having a microprism array and having very strong retro reflectivity. The space  14  is advantageously at, or approximately at, the corresponding height of a vehicle license plate. Thus, the blocks  1  of the invention are easily identifiable at night by the illumination of the passing motor vehicles. 
     Advantageously, the lower face  11  is completely flat, so that in the set-up position on the ground, it is impossible to lift the block from its base. 
     As is seen in the embodiment illustrated, the block is parallelepiped-shaped with a square base and is symmetrical relative to the median horizontal plane. 
     Preferably, the edges of the body  10 , delimiting the lower face  10  and the upper face  11 , the vertical faces of the lateral wall  13 , and the throat  14  are beveled (with sloped sides) and/or are rounded, so as to avoid sharp edges that otherwise would risk injury, especially since the block can have a height that is almost the height of a man. 
     Preferably, the dimensions of the block  1  are provided to be able to maximize their number in a 10-ton transport truck. 
     By way of example that is in no way limiting, the dimensions of a block  1  of the invention that is parallelepiped with a square or rectangular base are the following:
         Height: 900 or 950 mm,   Width and length: 900 or 950 mm×900 mm or 950 mm for a square base, and 600 mm×900 mm for a rectangular base,   Height of the throat  14 : 200 or 210 mm,   Depth of the throat (dimension in a horizontal plane): on the order of 50 mm.       

     With regard to  FIGS.  3  and  4   , the block  1  has, according to the invention, anchoring means  2  that are integral with the body  10  and that are intended for the lifting of the block, attachment means  3  that are integral with the block, and/or at least one space  14  and/or  4  and/or  5  and/or  6  and/or  7  ( FIGS.  1 ,  5 A,  6 , and  18 A ), the attachment means  3  and the space or spaces  14 ,  4 ,  5 ,  6  and  7  being intended to work with at least one apparatus to be mounted on/against the block, or to be engaged in the immediate proximity of the block. 
     The anchoring means  2  are advantageously arranged on the upper face  12  of the body in blind cavities  12 A. Preferably, there are two, and they are arranged symmetrically opposite, here along a diagonal. 
     According to the invention, the anchoring means  2  do not go beyond the plane made by the upper face  12 . They are therefore incorporated into the body  10  without protruding. 
     Preferably, the anchoring means  2  are configured to not be able to work with standard lifting means, but to work with specific non-standard lifting means, such as anchoring systems of the type of those marketed by the ARTEON Company. Thus, the anchoring means preferably do not have a ring shape or bridge design. They have, for example, a general geometry of a spherical or mushroom shape. 
     Depending on the use of the block, the attachment means  3  are arranged on the upper face  12  and/or on the peripheral wall  13 . 
     The attachment means  3  are, by way of example, threaded rods  30  ( FIG.  3   ), here numbering four, whose spacings correspond to standard attachment plates for the feet of posts. 
     In the variant embodiment of  FIG.  4   , the attachment means  3  are an attachment interface plate  31 , this plate being adapted as a function of the type of apparatus to be received and to be attached there. The plate is preferably made of galvanized steel. 
     The space  4  illustrated by way of example in  FIG.  5 A  forms a central opening in the body of the block in the area of the upper face  12 , which makes it possible to accommodate there a pole  40  as illustrated in  FIG.  5 B . 
       FIG.  6    illustrates another variant embodiment of the concrete block  1 , whose details will be described below. The block of this variant has the space  14  that constitutes the peripheral throat, a space  5  forming an oblong bore with a longitudinal axis along the height of the block, and a space  6  hereafter referred to as a cross space. This space is provided in the lateral wall on at least one of the vertical faces and preferably in the lower part of the block or in the middle part. 
     Other locations of spaces can be envisaged as a function of the use of the concrete block and of the functional apparatus to be engaged with it.  FIG.  18 A  shows still another example embodiment for which the concrete block  1  has two spaces in the lower part, of which a single space  7  is visible. This variant embodiment with regard to its use will be described below. 
     The spaces  14 ,  4 ,  5 ,  6  and  7  are made during manufacturing by molding of the blocks. Preferably, all of the blocks systematically have the peripheral throat  14 . The other spaces such as the central opening  4 , the bore  5 , or the cross spaces  6  and lower spaces  7  are produced (during the molding of the block) as a function of the destination/the final use of the block of the invention. 
     Preferably, the concrete block  1  has—with regard to  FIG.  2   —an illumination system S, particularly a reflector, which is in particular positioned in the lower part of the block and is able to illuminate upward so as to illuminate with a corresponding illumination angle at two upper corners  13 A and  13 B of the block to identify the size of the block at night. 
     Different examples of embodiment and use, in no way limiting, are now described with regard to  FIGS.  6  to  18 C . 
     Again with regard to  FIG.  6   , the latter illustrates a concrete block  1  of the invention used to attach thereto a connecting element  60  intended to connect remotely two concrete blocks  1 . Preferably, a security device could have a string of concrete blocks of the invention, connected to one another by connecting elements. This connecting element  60  is preferably flexible and mechanically solid, such as a strap, a cable. The connecting element is intended to be stretched between two concrete blocks  1  to push aside a truck that would run into said element and the blocks, forcing the truck that is striking a block to deviate from its path and finally to be stopped by the string of blocks. Preferably, the concrete blocks  1  would be spaced apart by about 1,400 mm, the connecting element  60  having a corresponding length of separation. 
     The connecting element  60  is made integral with a concrete block  1  so as to be able to be disengaged from the block only during the lifting of the block at the time of moving, removing the block from the place where it has been placed with regard to its access-denial function. 
     For this purpose, the body  10  of the block  1  has at least one vertical space  5  that extends along the entire height of the block and at a distance from the peripheral wall  13 , a locking bar  50  that is intended to be inserted and to slide into the space  5  as well as to work with the connecting element  60  to be added, and at least one access cross passage  6  (cross space) extending from the peripheral wall  13  to the vertical space  5 . 
     The vertical space  5  forms an oblong bore with a longitudinal axis along the height of the block and is passing through along the entire height of the block while leading to the two opposite faces: lower face  11  and upper face  12 . The cross-section of the bore is measurably greater than that of the locking bar  50  so that the latter can slide. By way of example, the cross-section of the space is 40 mm while that of the bar is 34 mm. 
     The locking bar  50  is rigid, preferably metal. It has a length that is less than the height of the concrete block  1 . Thus, in the position that is totally inserted into the vertical space  5 , it cannot protrude out from the upper face  12 , making it inaccessible. By way of example, for a concrete block body 950 mm high, the locking bar has a length of 750 mm. 
     The access passage  6  makes it possible to insert the connecting element  60  into the area of the vertical space  5  to then engage the locking bar  50  there. The passage is limited in volume to optimize the weight of the block. Preferably, it has a cross-section along a vertical plane that is customized to the engagement of a hand and of the end of the connecting element. By way of example, the passage has a cross-section of 150 mm by 150 mm. 
     The connecting element  60  has at its two opposite free ends  61  and  62  a closed loop that is non-detachable from the rest of the connecting element. 
     The engagement of a connecting element on a concrete block  1  of the invention is as follows: the block is put into place on the ground. One of the free ends  61  of the connecting element  60  is inserted into the passage  6  up to the vertical space  5 , the loop  61  being aligned relative to the vertical axis of the space. Then, the locking bar  50  is inserted into the vertical space  5  from the upper face  12  of the block, causing it to slide through the loop  61  of the connecting element, to the bottom of the block  1 , with the bar abutting against the ground. Thus, the connecting element  60  is engaged in this block  1 , without being able to be removed. 
     To disengage the connecting element  60  from the block and to withdraw it, it is necessary to lift the concrete block  1 , by at least the height of the bar  50 , to cause said locking bar to fall from the lower face  11  of the block. The loop  61  of the connecting element is then freed from the bar; by pulling back on the connecting element  60  from the passage  6 , the connecting element is withdrawn from the block. 
       FIGS.  7 A and  7 B  illustrate the block  1  that is used as an attachment and support base for an electric power cabinet  16 . It is common during temporary events to have to install electric power distribution cabinets. The concrete block of the invention makes it possible to install the cabinet at a height and not on the ground as is customary, the concrete base making possible a solid seating, without risk of tipping over the cabinet, for example in the event of inadvertent striking by a vehicle, in the event of wind or of crowd movement, and facilitating access to the cabinet at a man&#39;s height. 
     The electric power cabinet  16  is attached to the upper face  12  of the body of the block, for example by attaching in a releasable manner its bottom  17  to the attachment means  3  of the block (not visible here) that are adapted accordingly. 
       FIG.  8    illustrates two concrete blocks  1  of the invention, spaced apart. Each supports a post  8  that is integral with an attachment plate  80  that is attached to the upper face  12  of the block by means of the attachment means  3 . Each of the posts  8  makes possible the attaching of a gateway  81 , generally made of two parts  81 A and  81 B, to adjust the length of the gateway. Advantageously, the posts  8  have means  82  for adjusting the height of the gateway. 
       FIG.  9    shows another example of use of the concrete block  1  of the invention, making it possible to support in height a display panel  83 , in particular to be set up temporarily at a location. The panel  83  is arranged by placing, spaced apart, two concrete blocks  1  of the invention constituting, in addition to the access-denial blocks, ballast blocks, and each supporting a post  8  to which the panel  83  is attached. 
       FIG.  10    illustrates yet another example of use of the concrete block  1  equipped with the pole  40  of  FIG.  5 B  so as to support a banner  41 . 
       FIG.  11    shows the concrete block  1  used as a support for a sign apparatus  84 , for example to be set up temporarily during work, to support a sign panel or a work light. The sign apparatus  84  is attached by way of the attachment means  3  that are of the attachment plate type. 
       FIG.  12    shows the concrete block  1  used as a support for an advertising apparatus  85 , said apparatus consisting of a hollow cylindrical panel of a height corresponding to that of the block, and whose peripheral geometry corresponds to that of the peripheral contour of the block, here a multifaceted polygonal panel to correspond to the number of faces of the block. 
       FIG.  13 A  shows the use of the block  1  as a support for removable attachment of a barrier  9 , for example of a Vauban-type barrier with bars. In this configuration, the block  1  has the attachment means  3  that are placed on the lateral wall  13 , preferably in the peripheral throat  14 . The attachment means  3  here appear in the form of a square plate made integral (for example by bolting, not shown here) with a corner of the block. 
     In this embodiment, the attachment means  3  are configured to not protrude beyond the lateral face  13  when not in use, so that when the block is not in use, there is no danger of being accidentally hooked with the attachment means, and the blocks can be abutted to one another without difficulty for their storage, for example, during their transport. 
     The attachment means  3  have an attachment element  32  that is able to work mutually with the barrier  9 , as is seen in the detail view of  FIG.  13 B , particularly by comprising an arm attached to the plate  3  and a hook  33  that works by hooking with the end bar of the barrier  9 . The attachment element  32  that ensures the connection between the block  1  and the barrier is designed to withstand the toppling of several barriers abutted by hooking. 
       FIG.  13 C  illustrates an attachment plate  3  provided with at least one attachment hole  3   a  to secure the plate to the block  1  by bolting, and with an attachment element  32  according to a preferred embodiment of the invention. The attachment element  32  is telescopic by being adjustable in length in a horizontal plane when the plate is attached to the block so as to make possible an adjustment of the separation distance of the block  1  from the technical apparatus to be engaged, such as the barrier  9 . The attachment element  32  has a hook  33  that is integral with a slide  34  that is able to be mobile in a tube  35  by means of an adjusting screw  36  that works with the slide  34  and whose adjusting head  37  projects out of the tube  35  opposite the hook  33 . 
       FIG.  14    shows an additional example embodiment of the block relative to the positioning of the attachment means  3 . In no way limiting, the block  1  is provided with attachment plates  3  arranged in two opposite corners of the block, respectively in the throat  14  and in the low and high parts of the block, symmetrically to the peripheral throat  14 . Further, the low and high attachment plates  3  have an attachment element  32  of a shape different than hook-shaped, here in the shape of a ring. 
     In the context of the use of a barrier, another example for attachment or for engagement of technical apparatus is the one making possible a sliding engagement of the barrier relative to the concrete block (not shown in the figures). Thus, the body of the block comprises attachment/engagement means that constitute guide means for the sliding barrier. These engagement means make it possible to have the barrier slide parallel to the block. The block and the sliding barrier can, for example, ensure the closing/opening of an access of a public road in particular to screen this access, one of the ends of the barrier being engaged with one of the sides/edges of the block in the closed position of the barrier while the other end of the barrier works with a stop positioned on another block of the invention that is spaced apart by the length of the barrier, or any other stop. The engagement means attached to the body of the block are, for example, two pairs of guide rollers, such as ordinary guide rollers for a gate, the pairs of rollers being attached to one of the vertical faces of the body of the block, and preferably placed respectively in the low part and in the high part of the block; the barrier is equipped with wheels and is able to slide between the two guide rollers of each pair of rollers. 
     The concrete block of the invention will present its attachment means  3  with an apparatus to be added, which will be arranged as a function of the type of apparatus and of the use. 
       FIG.  15    illustrates the block  1  of the invention equipped with a hooking bar  38  as an attachment element that is integral with an attachment plate  3 . The bar  38  is metal, for example made of galvanized steel. It extends parallel to a lateral face of the block and projecting from it. It is attached by means of the attachment means  3 , such as a plate made integral with the lateral face of the block, more particularly in the area of the throat  14 , by means of the attachment means that are anchored in the block. The bar  38  can have various functionalities, such as to make possible the attachment of a barrier, of a banner . . . . 
       FIGS.  16 A and  16 B  illustrate yet another use for the concrete block of the invention. The concrete block  1  constitutes the support for attachment of a fence  90 , and advantageously for storing the fence when not in use. The fence  90  is foldable/unfoldable and has at least three vertical panels  90   a ,  90   b , and  90   c , preferably metal, such as of galvanized steel, which are hinged to one another to have, in the folded state of the fence ( FIG.  16 A ), a U shape surrounding at least three of the vertical faces of the lateral wall  13  of the block, and in the unfolded state ( FIG.  16 B ), an extension that is linear and (approximately) coplanar to one of the vertical faces of the block. 
     With regard to  FIG.  16 A , the width of each panel  90   a  to  90   c  corresponds to the width of each of the lateral faces of the block with which a panel is engaged in the folded position of the fence. The end panels  90   a  and  90   c  of the fence are attached by the attachment means  3 , such as attachment plates that are integral at least with one of the vertical faces of the lateral wall  13 , a face opposite to the one engaged with the middle panel, and near the four low and high corners of said face. A fourth panel  90   d , visible in  FIG.  16 B , can be provided in addition by being mounted in a detachable manner on the vertical face of the block that is provided with the attachment means  3 , so as in particular to hide the concrete block. The attachment of the panels to the attachment means  3  can, for example, be done by means of hooks that are integral with the panels with rings that are integral with the attachment means  3 . 
       FIG.  16 C  illustrates the pairing of two foldable fences  90  by positioning two concrete blocks  1  of the invention that are spaced apart and each equipped with a fence  90  in the unfolded state providing a continuous metal wall. 
     The height of the concrete block  1  will be adapted to the height of the fence  90  to provide an attachment that is high enough for the end panel and for the start of the fence, so as to ensure sufficient rigidity in height for the fence in its expanded/unfolded state. 
       FIG.  17    also shows an additional variant of the block  1  for supporting a fence or fencing  91 . The block  1  has at least one brace  92  that is attached to the upper face  12  of the block. The securing of the brace is preferably done as a result of the attachment means  3  provided on the upper face of the block during its manufacture. 
     The brace  92  has an upright  93  extending vertically near one of the peripheral edges of the upper face  12  and in a manner that is approximately coplanar to one of the vertical faces of the peripheral wall  13 , so as to make possible the releasable attachment of the fencing  91  in the extension of said vertical face. Advantageously, depending on the type of fencing to be set up, the brace  92 , more particularly the upright  93 , will be provided with means for attaching and for working that are suitable with the type of fencing. By way of example, the upright  93  has suitable means for attachment to construction site fencing of the type of that marketed by the Heras® Company. 
     Finally,  FIGS.  18 A to  18 C  also illustrate an additional example of embodiment and use of the concrete block  1  of the invention in an access-denial device comprising two concrete blocks  1  of the invention and traffic barriers. 
     The concrete block  1  is configured to receive in the low part ( FIG.  18 A ) a folding roadblock traffic barrier  70  with spikes. For this purpose, the body  10  of the block  1  has a lower space  7 , at least on one of its sides, along an L-shaped recess on its lower face  11  and from the peripheral lateral wall  13 . The recess is made over a height that is greater than the height of the spikes of the traffic barrier. 
     The recess  7  further has a runner  71  with a longitudinal axis extending parallel to the edge of the lateral wall, with a length that is less than the recess  7  (for example, 700 mm for a recess length of 950 mm), and opening out opposite the lower face  11 . This runner is intended to receive a pin  72  perpendicular to said runner  71  and integral with the traffic barrier  70 , in such a way as to engage the traffic barrier with the body of the block  1 . The pin  72  of the traffic barrier also constitutes a pivoting axis for the traffic barrier, in a horizonal plane, making it possible for the traffic barrier  70  to be unfolded and, if necessary, to slide in the runner  71 . 
     In the position of use ( FIGS.  18 B and  18 C ), the access-denial device has two concrete blocks  1  that are spaced apart and each equipped with a fold-out traffic barrier  70 , the two traffic barriers being, on the one hand, in their folded state ( FIG.  18 B ) and each stored in the recess  7  of the associated block, and, on the other hand, connected to one another by a rigid rail  73 , the rail corresponding to the length of separation of the two blocks  1 , in particular 1,400 mm. 
     In the event of a determination to intrude, if a truck strikes one of the blocks  1 , the latter, while moving, will cause the deployment of the two traffic barriers ( FIG.  18 C ) with a separation of the two blocks  1  to a length of 4,200 mm, necessarily causing the truck to be shoved aside or to drive over the traffic barrier, regardless of the position of the wheel assemblies, inevitably stopping it. 
     Consequently, the concrete block  1  proposed by the invention constitutes—upon exiting from manufacture, in addition to an access-denial system—a functional block with which various technical apparatus can be engaged as a result of its spaces and/or attachment means that are incorporated into the body of the block, and in such a way as to be delivered ready to be set up and ready for use.