MODULAR ELEMENT FOR CRAWL SPACES AND FLOOR STRUCTURES

Abstract: Modular element for floor structures or crawl spaces used in self-supporting structures, the modular element including an upper surface (11) and supporting legs (13), the modular element defining, either alone or in combination with one or more identical modular elements (10) associated therewith, a seating (17) to position and anchor a structural reinforcement element, the seating (17) being sized in such a way as to accommodate a reinforcement element suitable to fulfil a static bearing function, the structural reinforcement elements, once installed and incorporated into the cast concrete, allowing to form a self-supporting reinforced structure.

Description: "MODULAR ELEMENT FOR CRAWL SPACES AND FLOOR STRUCTURES" This invention concerns a modular element for crawl spaces and floor structures as set forth in the main claim. The modular element according to the invention is applied in the building trade, for both civil and industrial buildings and restructuring, so as to achieve self- supporting constructions to be cast on site, suitable to function as a crawl space to insulate the floors from the underlying ground, and also as an intermediate floor structure between storeys, and also to achieve roofing, floating floors, ventilated roofs, upset roofs or other similar structures. BACKGROUND OF THE INVENTION The state of the art includes structures, called crawl spaces, used to make the bases for floors and suitable to create an insulating interspace between the floor and the underlying ground so as to prevent humidity and/or concentrations of gas from rising inside the buildings. These structures define interspaces suitable to allow the air to circulate. They are made of modular elements consisting of expendable formworks equipped with legs and able to be jointed together or associated in some other manner . These formworks are easy and quick to install, and moreover the concrete can be cast immediately after they have been installed. The formworks, associated together, define on the upper part a substantially continuous surface which acts as a base for the cast concrete, and a plurality of vertical ribs and fissures which form pillars, uniformly distributed and able to increase the load capacity of the crawl space. In a large number of applications, the covering layer of concrete is reinforced with metal rods, consisting of an electronically welded mesh and/or iron round pieces, in order to consolidate the floor. The metal rod reinforcement is placed on the plane defined by the formworks and then incorporated into the covering layer of concrete. When round pieces are used, as it is not possible to anchor these elements to the formworks, the round pieces are attached to each other with metallic wire, by means of welding or other operations in order to prevent them from moving from their original collocation during the laying of the concrete. All this causes problems which limit the complete and rational use of the crawl spaces with expendable formworks. Another disadvantage is that structures such as are known in the state of the art made with such formworks are not self-supporting and therefore need an adequate support on an appropriately consolidated foundation. In the event that the underlying foundation should subside, even in part, the whole planar structure consisting of the modular elements already assembled may crack, yield or bend, with obvious dangerous consequences to the floors above . Furthermore, since the finished floor structure is not self-supporting, the modular elements known in the state of the art cannot be used in an efficient manner to construct self-supporting floor structures. The present Applicants have designed and embodied this invention to overcome the shortcomings of the state of the art and to obtain further advantages. SUMMARY OF THE INVENTION The invention is set forth and characterised in the main claim, while the dependent claims describe other characteristics of the idea of the main embodiment. The purpose of the invention is to provide a modular element which can be used in self-supporting structures suitable to be used both below the base plane of the construction, to ensure insulation between the floor and the underlying ground, and also as a floor structure between intermediate storeys, and also as a roofing element. The fact that the structure obtained with a plurality of modular elements according to the invention is self- supporting ensures that it has a high level of stability, even when there is a partly yielding supporting surface or base ground. The modular element according to the invention is substantially characterised in that it allows, alone or in combination with one or more analogous modular elements associated therewith, to position and anchor the structural reinforcement elements, such as beams, joists, lattices or similar, which have a static bearing function. Such structural reinforcement elements, once they have been installed and incorporated into the cast concrete, form a self-supporting structure, which can also have a net-like structure, one-directional or two-directional. The structure performs both a stabilising function if positioned on yielding bases or ground, and also, especially, the function of a self-supporting structure to constitute, for example, a floor structure for intermediate storeys or a roofing for the construction. The floor structure defined with the modular elements according to the invention can be either planar or inclined, vaulted, barrel-shaped, dome-shaped, or some other shape. The modular element according to the invention also allows an easy and quick positioning of conduits, pipes and cables, and an easy and accurate positioning of auxiliary reinforcement elements, for example round pieces or longitudinal rods, which act as a further support and reinforcement . Another purpose of the invention is to obtain a modular element which can be used to support or accommodate accessory elements functional to the installation, preparation and/or functioning of technological networks or service networks of the construction where it is used. A further purpose of the invention is to considerably reduce the spaces needed for storage, and also to facilitate transport and on-site assembly operations and make them more functional . The modular element according to the invention has a conformation defined by lower supporting legs and by a substantially planar upper surface. The upper surface is defined by a convex base plane which bends downwards in such a way that it extends, at the corners, into the aforesaid legs substantially without interruption. The structure thus obtained delimits, inside and below, a space which guarantees a suitable insulating height between the upper surface and the floor, and also a ventilation area wherein the air can circulate. According to the invention, in a first embodiment, in correspondence with at least one side the modular element has its relative legs, located at the four corners, connected to each other by an arch which is lowered with respect to the base plane of the upper surface. The lowered arch, when coupled with an identical lowered arch of an adjacent modular element, defines a positioning seating suitable to accommodate a reinforcement element, such as a beam, a joist or a lattice. According to the invention, the positioning seating has a - - depth of at least 10 centimetres with respect to the highest point defined by the upper surface of the modular element, thus allowing a reinforcement element with static structural bearing characteristics to be positioned. The conformation of the structural reinforcement element can be chosen as desired, for example rectangular, T-shaped, triangular or other. By coupling a plurality of modular elements according to the invention until a substantially continuous surface is achieved which defines the floor or the floor structure element, a plurality of positioning seatings is defined for reinforcement elements. The reinforcement elements, placed in position, can form a reinforced structure which, when incorporated into the cast concrete and after consolidation thereof, constitutes a self-supporting structure which collaborates to form the floor of the construction, whether it be a base floor or an intermediate floor. In another embodiment of the invention, the modular element comprises a lowered hollow made along at least one median axis of its upper surface and defining the positioning seating for the reinforcement element, beam, joist or lattice. In this case too, by coupling a plurality of modular elements according to the invention it is possible to define positioning seatings which will allow to form a reinforced mesh with a self-supporting and consolidating structural function. According to another embodiment of the invention, the modular element comprises an auxiliary element shaped like a bow and a cradle, equipped with means to anchor itself to the bow-shaped lateral edges of two elements of the type described above and arranged adjacent to each other, so as to define at least a positioning seating for reinforcement elements . In this embodiment, therefore, the modular elements of the type described above do not couple directly with each other, attaching the relative lateral edges, but by means of the bow-shaped and cradle-shaped auxiliary elements, which thus perform both the function of reciprocal connection between the modular elements, and also that of positioning seating for the reinforcement elements. Two or more auxiliary elements may be arranged laterally adjacent to position two respective reinforcement elements adjacent, so as to constitute a beam of a width which is a multiple of the width of the individual reinforcement element . According to a variant, the positioning seatings for the reinforcement elements include means or seatings to support and accommodate auxiliary round pieces or rods, the function of which is to stiffen and further reinforce the self- supporting structure consisting of the combination of modular elements. The modular element according to the invention can assume, in a variant of the invention, a conformation without any protruding zones or discontinuities, and with all positive angles so that, in the event it is used to make floor structure elements, the element can be removed after the concrete cast has been made and consolidated. According to one embodiment of the invention, the lower end of the legs is shaped in such a manner as to ensure that the modular element lies stably on the base surface and to allow easy and rapid connection operations to associate two or more modular elements according to the invention to each other . According to another variant, the lower ends of the legs include means to attach the modular element to the supporting surface, such as for example, holes for screws, nails or rivets. These attachment means can also be employed to mount possible extensions, used to raise the plane defined by the modular elements. According to another variant, in correspondence with the upper face there is at least a hole whose inner surface defines a truncated cone, or a truncated pyramid. According to a first variant, the smaller base of this hole is closed, and is located at the same height as the supporting base of the modular element. According to another variant, the hole is central; according to yet another variant, the invention has two or more holes. When the elements are stored, at least one hole makes it possible to place the elements one above the other and stack them temporarily, so as to make a stable and easily transportable stack. During the operational step, before the concrete is poured, the independent load capacity is much higher. It is within the spirit of the invention to provide ridges, in correspondence with the support for the beams, lattices or otherwise, the ridges being suitable to hold the metal structure detached from the surface of the modular element or in any case from its positioning seating, in order to obtain that the metal structure is completely incorporated into the concrete. BRIEF DESCRIPTION OF THE DRAWINGS The attached Figures are given as a non-restrictive example, and show some preferred embodiments of the invention as follows: Fig. 1 is a side view of two adjacent modular elements according to the invention; Fig. 2a .is a view from above of four modular elements according to the invention coupled so as to form a section of self-supporting floor or floor structure element; Fig. 2b shows a variant of Fig. 2a with a floor structure with crossed ribs; Fig. 3 shows a cross-section of one half of a modular element according to the invention in a variant of Fig. 1; Fig. 4 is a side view of a modular element according to another embodiment of the invention; Fig. 5 is a view from above of the modular element shown in Fig. 4; Fig. 6 shows two modular elements according to another embodiment of the invention coupled together; Fig. 7 is a prospective view of an auxiliary element used in the embodiment shown in Fig . 6 ; Fig. 8 shows the auxiliary element shown in Fig. 7 after one end has been removed; Fig. 9 shows two auxiliary elements coupled; Fig. 10 shows the auxiliary element shown in Fig. 7 arranged in its working position; Fig. 11 is a prospective view of a plurality of modular elements coupled to constitute a section of floor structure or crawl space; Fig. 12 shows a variant of Fig. 11 applied to achieve a two- directional mesh and wherein two adjacent auxiliary elements are used to accommodate two reinforcement elements. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS The modular element 10 according to the invention is shown in the attached Figures in some of its preferred embodiments . It has substantially a single structure made of plastic or some other equivalent material, advantageously of a recyclable or environmental-friendly type. The single structure is defined by an upper face 11, convex and substantially circular in shape, including in the case shown here a centre 12, consisting of a circular, concave surface. At the four corners, the upper face 11 extends downwards so as to constitute four legs 13, respectively 13a, 13b, 13c and 13d (Fig. 5) . Each leg 13 has a base 14 equipped with specific connection means 15a and/or 15b, and possibly with holes, not shown here, to possibly attach the element to the ground or to the supporting surface, by means of screws, nails or other means. These holes can also be used to position possible extensions if it should be desired to increase the height of the plane defined by the elements 10. The connection elements 15b consist of an extension of the supporting base 14 and are equipped with an abutment element 16 of a substantially semi-circular shape which delimits a supporting surface for the mating elements 15a of the adjacent modular element 10. The connection elements 15a also constitute an extension of the supporting base 14 but their supporting surface is at a height substantially corresponding with the thickness of the supporting surface of the elements 15b. In this way, when several modular elements 10 according to the invention are connected together, the connection elements 15a are super-imposed above the connection elements 15b. In this case, so as to allow every modular element 10 to couple with the four adjacent modular elements 10, the legs 13a and 13c include both the connection element 15a and also 15b, the leg 13b includes two connection elements 15b, and finally the leg 13d includes two elements 15a, as shown in Fig. 5. Each of the legs 13 is connected to an adjacent leg 13 by means of an arch 19, defining the four sides of the modular element 10; the arches 19 also have the function of defining the zone through which air can pass, underneath the plane defined by the upper face 11. In the embodiment shown in Figs. 1-÷J , at least two arches 19 defining two opposite sides of the modular element 10 are lowered with respect to the height of the upper surface 11 so as to define, together with the lowered arch 19 of a mating adjacent modular element 10, a positioning seating 17 for a structural reinforcement element 18, in this case consisting of a rectangular beam. The positioning seating 17 is sized, with respect to the upper level of the modular element 10, in such a way as to be able to accommodate a reinforcement element 18 suitable to perform a static bearing function, after the concrete has been cast to achieve the floor structure or crawl space. In the preferential embodiment of the invention, the depth of the positioning seating 17 with respect to the highest level of the upper surface of the modular element 10 is at least 10 centimetres. When the modular elements 10 are assembled, in the step when the crawl space is formed under a floor, or of a floor structure element for an intermediate storey or for a roof, a plurality of seatings 17 are defined which allow reinforcement elements 18 to be installed. The reinforcement elements 18, once incorporated into the cast concrete, constitute a reinforced mesh either one- directional (Fig. 2a) or two-directional with crossed ribs (Fig. 2b), which makes the entire structure self-supporting and hence suitable to be positioned on a partly yielding ground, and to use as a self-supporting floor structure for an intermediate storey or for a roof. The reinforcement elements 18 may co-operate with longitudinal rods or round pieces 21 housed below the plane of the upper surface 11 in appropriate grooves 20 made along a median axis of the surface 11. The longitudinal rods or round pieces 21 may equally be inserted inside the volume defined by the reinforcement elements 18. In the variant shown in Fig. 3, on the outer surface of the lowered arch 19, the modular element 10 has means 22 to support and position other longitudinal rods or round pieces 21, the function of which is to stiffen and further consolidate the self-supporting structure defined by the combination of modular elements 10. In Fig. 3 a line of dashes shows a pipe 34 which can be located below the upper surface 11. Fig. 3 also shows, in part, a pillar 30, the function and characteristics of which will be explained in greater detail with reference to Fig. 6. In the variant shown in Fig. 4, along one of its median axes, the modular element 10 has a hollow defining a positioning seating 17 for a reinforcement element 18, in this case a rectangular lattice. By coupling a plurality of modular elements 10 in the manner shown in Fig. 2, in this case too we obtain a one- directional or two-directional mesh, consisting of a plurality of reinforcement elements 18 having a static function, such as beams, joists, lattices, of any shape or section provided they are compatible with the size of the seating 17. The reinforcement elements 18 co-operate with the rods or round pieces 21 inserted into the median grooves 20 of the upper surface 11. In the case shown in Fig. 4, on the inner walls of the seating 17 there are means 22 to support and position auxiliary reinforcing round pieces 21. The means 22, like the means 22 shown in Fig. 3, can be used to position and protect grooves or small conduits used to form technological networks, for example water or electricity, or service networks. This use is particularly efficacious when the modular elements 10 are applied as floor structure elements for intermediate storeys. The further embodiment shown in Fig. 6 provides that the modular elements 10 are not reciprocally connected by direct coupling of the respective arches 19, but by means of an auxiliary connection element 23, shaped substantially like an arch and like a cradle, located between two adjacent elements 10. The edges 24 of the auxiliary element 23 are hook-shaped, mating with the shape of the arches 19 of the elements 10. The edges 24 anchor on the arches 19 of the modular elements 10 on which they are applied and follow the development thereof substantially until they are level with the supporting surface (Fig. 10) . The function of the auxiliary element 23 is to define a positioning seating 17 for a reinforcement element 18, in the case of Fig. 6, a T-beam. In the case of Fig. 10, the seating 17 has a positioning groove which maintains the reinforcement element 18 in position once it has been inserted inside. As can be seen in Fig. 7, the seating 17 is defined laterally by the inner walls of the edges 19 and, in this embodiment, has supporting elements 36 on the bottom 25 which allow to keep the reinforcement elements 18 slightly raised with respect to the supporting plane so as to allow them to be completely incorporated in the concrete when it has been cast . The supporting elements 36 can incorporate or co-operate with elements to clamp and position the reinforcement elements . At least one of the points 39 of the auxiliary element 26, in this case, has a pre-breaking cut 37 which allows to easily remove the last segment of the point in order to prepare the auxiliary element 23 for in-line lock-on coupling with another auxiliary element 23 of the same type, as shown in Fig. 9. The auxiliary elements 23 may include their own base means 38 to anchor them to the supporting surface. As in the cases shown previously, when a plurality of elements 10 is assembled to form a substantially plane structure with the desired dimension, the auxiliary elements 23 allow to define a plurality of seatings 17 which constitute a reinforced mesh with a structural function, as shown in Fig. 11 which refers to a one-directional embodiment . On the contrary, the embodiment shown in Fig. 12 refers to a two-directional structure, wherein the auxiliary elements 23 are arranged in two directions orthogonal to each other in an intermediate position between adjacent modular elements 10. The point 39 of each auxiliary element 23 is shaped in a right angle so as to be able to couple with the points 39 of the other contiguous auxiliary elements 23. In this case, between two elements 10 there are two auxiliary elements 23 arranged adjacent with the respective co-operating edges 24, so that two adjacent reinforcement elements 18 can be inserted into the respective seatings 17. It is possible however, within the limits of the design plans and according to the overloads and gaps required, to provide even three or more auxiliary elements 23 arranged adjacent between two elements 10, each of these co-operating with a respective reinforcement element 18. In the case shown in Fig. 6, only for the modular element 10 on the right, in the underlying part of the upper surface 11, there are means 26 to support and position conduits or grooves for technological networks or service networks . The means 26 can consist of guide holes inside which the conduits or grooves are inserted. Again in the embodiment shown in Fig. 6, on the upper face 11 in correspondence with the center 12, instead of the concave circular surface, there is a hole 35 with a circular section defining, in co-operation with a wall 31, a hollow pillar element 30 to act as a support and reinforcement, in this case shaped like a truncated cone, closed at the lower part by a base 33. Along the pillar element 30 there are one or more furrows 32a, 32b on the wall 31 which allow the lower section 30a alone, or also an intermediate section 32b, to be easily separated from the pillar element 30. The lower 30a or intermediate 30b section, once detached, are inserted inside the hole 35 and act as a plug, thus allowing to prevent the pillar element from filling up.

Claims: CLAIMS 1 - Modular element for floor structures or craw spaces used in self-supporting structures suitable to function either as insulation for floors from the underlying ground or as a floor structure for intermediate storeys, roofing, floating floors, ventilated roofs or upset roofs, the modular element including an upper surface (11) and supporting legs (13), a plurality of the modular elements being able to be combined to achieve a substantially continuous structure, the element being characterised in that, either alone or in combination with one or more identical modular elements (10) associated therewith, it includes a seating (17) to position and anchor a structural reinforcement element (18) , such as a beam, a joist or a lattice, the seating (17) being sized in such a way as to accommodate a reinforcement element (18) suitable to fulfil a static bearing function, the structural reinforcement elements (18) , once installed and incorporated into the cast concrete, allowing to form a self-supporting reinforced structure. 2 - Modular element as in Claim 1, characterised in that the positioning seating (17) has a depth, with respect to the highest level of the upper surface (11), of at least 10 centimetres . 3 - Modular element as in Claim 1, characterised in that the reinforced mesh is of the one-directional type. 4 - Modular element as in Claim 1, characterised in that the reinforced mesh is two-directional with crossed ribs. 5 - Modular element as in Claim 1, characterised in that, in correspondence with at least one side, it has an arch (19) lowered with respect to the base plane of the upper surface (11), the lowered arch (19) defining, together with an identical adjacent lowered arch (19) of an adjacent modular element (10), the seating (17) to position and anchor at - - least one reinforcement element (18) . 6 - Modular element as in Claim 1, characterised in that it comprises an auxiliary connection element (23), shaped substantially like an arch and a cradle, including lateral edges (24) shaped like a hook and suitable to be attached to the arches (19) of two adjacent modular elements (10) to define the seating (17) to position and anchor at least one reinforcement element (18) . 7 - Modular element as in Claim 6, characterised in that two or more auxiliary elements (23) are suitable to be placed side by side by coupling the respective lateral edges (24) to define two adjacent positioning seatings (17) for two reinforcement elements (18). 8 - Modular element as in Claim 6, characterised in that the auxiliary element (23) includes, on the bottom (25) of the seating (17), supporting elements (36) suitable to hold the relative reinforcement element (18) in a raised position and to allow it to be incorporated substantially completely into the cast concrete. 9 - Modular element as in Claim 6, characterised in that the auxiliary element (23) has a point (39) equipped with a pre- breaking cut (37) such as to allow the removal of a last section in the event of in-line coupling of two or more auxiliary elements (23). 10 - Modular element as in Claim 1, characterised in that it has, along one of its median axes, a hollow defining the seating (17) to position and anchor at least one reinforcement element (18) . 11 - Modular element as in any claim hereinbefore, characterised in that the reinforcement element (18) consists of a beam, a joist or a lattice, rectangular, triangular, T-shaped or in any other desired shape. 12 - Modular element as in any claim hereinbefore, characterised in that in co-operation with the seatings (17) to position and anchor reinforcement elements (18) there are means or seatings (22) to support and position auxiliary round pieces or rods . 13 - Modular element as in Claim 1, characterised in that, below the upper surface (11), it includes means or holes (26) to support and position conduits or grooves for technological or service networks . 14 - Modular element as in Claim 1, characterised in that in an underlying position the upper surface (11) includes at least a supporting and reinforcing pillar element (30) . 15 - Modular element as in Claim 14, characterised in that the supporting and reinforcing pillar element (30) is open at the upper part and has at least one preferential pre- breaking zone (32) to define at least a sub-element (30a) which can be detached from the modular element (10) and inserted as a lock-in plug to close the element (30) . AMENDED CLAIMS [received by the International Bureau on 04 April 2000 (04.04.00); original claims 1-6 amended; remaining claims unchanged (3 pages)] 1 - Modular element able to define, together to other analogous modular elements, for a floor structure for intermediate storeys, roofing, floating floors, ventilated roofs or upset roofs or a craw space used in self-supporting structures able to insulate the floors from the underlying ground, said modular element including an upper surface (11) , a plurality of supporting legs (13) and lateral walls able to be associated to corresponding lateral walls of said other analogous modular elements to achieve a substantially continuous structure, characterised in that in correspondence of at least one of said lateral walls means are provided to define, alone or in combination with corresponding means of said other analogous modular elements (10), or to accommodate an external element able to define a seating (17) able to lodge upwardly at least one structural reinforcement element (18), such as a beam, a joist or a lattice able to fulfil a static bearing function, whereby said structural reinforcement element (18) , once installed and incorporated into a cast concrete, is able to perform the formation of a self-supporting reinforced structure, said seating (17) being shaped in such a manner that said modular element defines downwardly a continuity of port together with said other analogous modular elements (10) , for lodging conduits, pipes (34) or similar elements. 2 - Modular element as in Claim 1, characterised in that said seating (17) has a depth, with respect to the highest level of the upper surface (11), of at least 10 centimetres. 3 - Modular element as in Claim 1, characterised in that said at least one structural reinforcement element (18) defines a reinforced mesh of one-directional type. 4 - Modular element as in Claim 1, characterised in that said at least one structural reinforcement element (18) defines a reinforced mesh of two-directional type with crossed ribs. 5 - Modular element as in Claim 1, characterised in that, in correspondence with at least one side, it has an arch (19) lowered with respect to the base plane of the upper surface (11), the lowered arch (19) defining, together with an identical adjacent lowered arch (19) of an adjacent modular element (10), said seating (17) to position and anchor at least one of said structural reinforcement elements (18). 6 - Modular element as in Claim 1, characterised in that it further comprises an auxiliary connection element (23), shaped substantially like an arch and a cradle, including lateral edges (24) shaped like a hook and suitable to be attached to the arches (19) of two adjacent modular elements (10) to define the seating (17) to position and anchor at least one of said structural reinforcement elements (18) . 7 - Modular element as in Claim 6, characterised in that two or more auxiliary elements (23) are suitable to be placed side by side by coupling the respective lateral edges (24) to define two adjacent positioning seatings (17) for two reinforcement elements (18) . 8 - Modular element as in Claim 6, characterised in that the auxiliary element (23) includes, on the bottom (25) of the seating (17), supporting elements (36) suitable to hold the relative reinforcement element (18) in a raised position and to allow it to be incorporated substantially completely into the cast concrete. 9 - Modular element as in Claim 6, characterised in that the auxiliary element (23) has a point (39) equipped with a pre- breaking cut (37) such as to allow the removal of a last section in the event of in-line coupling of two or more auxiliary elements (23). 10 - Modular element as in Claim 1, characterised in that it has, along one of its median axes, a hollow defining the seating (17) to position and anchor at least one reinforcement element (18). 11 - Modular element as in any claim hereinbefore, characterised in that the reinforcement element (18) consists of a beam, a joist or a lattice, rectangular, triangular, T-shaped or in any other desired shape. 12 - Modular element as in any claim hereinbefore, characterised in that in co-operation with the seatings (17) to position and anchor reinforcement elements (18) there are means or seatings (22) to support and position auxiliary round pieces or rods . 13 - Modular element as in Claim 1, characterised in that, below the upper surface (11), it includes means or holes (26) to support and position conduits or grooves for technological or service networks. 14 - Modular element as in Claim 1, characterised in that in an underlying position the upper surface (11) includes at least a supporting and reinforcing pillar element (30) . 15 - Modular element as in Claim 14, characterised in that the supporting and reinforcing pillar element (30) is open at the upper part and has at least one preferential pre- breaking zone (32) to define at least a sub-element (30a) which can be detached from the modular element (10) and inserted as a lock-in plug to close the element (30) .

Inventors: PONTAROLO VALERIO, PONTAROLO, VALERIO
Applicants: PONTAROLO VALERIO, PONTAROLO, VALERIO
Application year: 1999
Main classification: E04B5
IPC codes: E04B5