FR2683242A1 - MODULAR SLAB FOR HORIZONTAL WALL. - Google Patents

Abstract

The invention relates to a modular slab for a horizontal partition, in particular for raised floors. It comprises a first metal element (10) comprising a flat rectangular plate (12) provided with a rim (14) substantially perpendicular to said plate, a second metal element (16) comprising a rectangular flat plate (18) provided with a rim (20) substantially perpendicular to said plate, the assembly being such that the rims of the two elements cooperate mechanically directly or indirectly. The internal space limited by the two elements is substantially filled by an internal reinforcement structure (22, 42) which mechanically cooperates with the two elements.

Description

MODULAR SLAB FOR HORIZONTAL WALL

  The present invention relates to a modular slab

for horizontal partition.

  More specifically, the invention relates to modular slabs whose combination allows for horizontal partitions including raised floors or raised floors. When planning office or industrial premises, it is more and more often planned to install a raised floor to allow the installation of electric cables, telephone cables, pipes or

  Service ducts between the floor itself and the raised floor.

  The subfloor is made of modular slabs, most of which are square and 600 mm in

  on small columns whose feet rest themselves on the ground.

  These columns may comprise a jack for a setting

rigorous at floor level.

  It is this assembly which is shown in perspective in Figure 7 attached E Columns were shown which have at their top a plate F The columns are located at the top of squares having dimensions corresponding to those of slabs GI slabs, G 2 rest by their summits

  on the plates F integral with the columns.

  These modular slabs must of course have a number of properties. Firstly, it is necessary for the periphery of the slab to have a high resistance to bending in order to prevent, under the effect of a vertical load on a slab does not cause a deformation of a part of the periphery of this slab, this part of the periphery not being at the same level as the periphery of the neighboring slab. From this point of view, tests are planned to check the resistance for example, at a load of 500 kg applied to a surface of 4 x 4 cm. It is also necessary that the current surface of the slab (within its periphery) has the same resistance under the effect of a vertical point load which is tested in a similar manner.

perforation.

  It is also desirable that the modular slab be insensitive to moisture in order to avoid deformations that

  could result in the materials used.

  It must also exhibit satisfactory fire behavior, firstly with regard to its reaction to fire (non-flammability), secondly with regard to its fire resistance, that is to say, its performance. mechanical fire, and its ability not to transmit a temperature rise from one of its faces to another. It is also necessary that the slab presents in the horizontal plane a great dimensional precision in order to allow

  the assembly of slabs to form a false floor.

  It is also useful that the slab has the properties of sound insulation and possibly the properties

of thermal insulation desired.

  In addition, during their initial introduction or subsequent interventions on the subfloor, these slabs are subject to many handling operations It is therefore preferable that their weight is as small as possible to facilitate handling when transporting them or when

of their establishment.

  Finally, the development of industrial premises or offices requires the use of a large number of slabs, given the huge surfaces to be equipped It is therefore very desirable that their production costs be as small as possible, the cost of Ot production depends well on the one hand, on the one hand, the nature and quantity of the products used and, on the other hand, machining and assembly operations that their manufacture requires. In most cases, the slabs are made in the following way: starting from a "tray" formed from a flat sheet whose thickness is of the order of 1 mm, whose edges are folded perpendicularly the plane of the sheet and the corners of the rim thus formed are either left open, which ensures no stiffening of the sheet and provides no sealing, or closed, for example by welding In this second case, it avoids the disadvantages mentioned above but the manufacturing cost is increased It is understood that such a tray does not have any of the features listed above It is therefore necessary to complete the slab by mounting in the tray an internal element that will provide the required characteristics It will be therefore, most often, a chipboard of high density and therefore of high weight The choice of adequate high density of the material certainly allows to obtain a high mechanical strength e but at 'price' very high On the one hand the cost itself of the material increases with its density On the other hand the higher weight due to the increase of density is not necessarily desirable for reasons mentioned previously De more, it is necessary to use a material whose other main characteristics are rather negative for the intended application, that is to say, a high sensitivity to moisture may cause deformation of the slab and fire behavior little satisfactory also generating a large heat input in the building equipped with these slabs in case of fire thereof in its uncontrolled phase. More generally, it is understood that with this type of solution, the "tray" metal itself does not provide any significant characteristic of mechanical strength This property is obtained by the element placed in the "tray" which can not, by its unitary character, satisfy others

  conditions to which the modular slab must satisfy.

  To overcome these drawbacks, it has also been proposed to close the "tray" internally provided with its strength member with a plate forming "cover" which can be glued to the upper face of the mechanical strength element and / or welded This technique certainly gives the slab an increase in sealing properties but at the cost of a significant increase in cost. However, this does not significantly increase the mechanical strength of the assembly and all This does not increase its resistance to vertical loads on its periphery unless a thick sheet is used to make the lid. It is therefore the element placed in the tray that must alone satisfy the various conditions to be met. with the exception of the problems of waterproofing It is therefore understandable that this solution, besides the fact that it is expensive,

  does not really solve the problems posed as a whole.

  In order to compensate for the insufficient mechanical strength of the known slabs in the case of heavy loads, it has been proposed in this case a particular mounting of the modular slabs on a structure of frames or sleepers reinforcing the mechanical strength of the slabs to the vertical loads at their periphery. 8 shows in perspective such an assembly The columns A whose feet rest on the ground B have their heads which are connected between

  they are cross-members such as C, which form frames.

  The periphery of each slab Di, D 2, D 3 rests on the upper face of these crosspieces in contrast with the assembly of Figure 7 in which the slabs rest only by their vertices on the upper ends of the columns are then the sleepers they -What strengthens the resistance of the periphery of the slabs and prevents the deformation of the periphery of the slabs It is understood, however, that this solution causes a very significant increase in cost because of the greater complexity of the support structure and the increase in exposure time and it is therefore very desirable to limit the

  number of cases where it is necessary to use it.

  To overcome the disadvantages of the earlier solutions described above, an object of the present invention is to provide a modular slab for horizontal partition which has a high mechanical strength while being able to remain relatively light, which can ensure a perfect seal to the penetration of moisture , with ideal characteristics for its fire behavior (reaction and resistance to

  fire) and which is of a reduced cost.

  To achieve this purpose, the modular slab for horizontal partition according to the invention is characterized in that it comprises a first metal element having a rectangular flat plate provided with a flange substantially perpendicular to said plate, a second metal element having a plate rectangular plane provided with a flange substantially perpendicular to said plate, the rim of one of said elements being able to penetrate into the space limited by the plate and the rim of the other element, the mounting being such that the edges of the two elements cooperate mechanically to give the support frame thus produced a high mechanical resistance to vertical loads at its periphery, and in that the internal space limited by the two elements is substantially filled by a reinforcing structure which mechanically cooperates with said support frame and with the two plates, whereby each of the faces of said structure is s ensibly in contact with one of said plates, said structure having a mechanical strength

  elevated in the direction perpendicular to said plates.

  It is understood that the modular slab according to the invention meets the main requirements previously stated The mechanical cooperation of the edges of the two elements provides the

  slab a rigid support frame vis-à-vis the vertical loads.

  In addition, the presence of the internal structure itself having a high resistance to vertical loads, cooperating with the frame, thereby provides a great stiffness in flexion and torsion in the horizontal plane to the whole. and distributes this high resistance to vertical loads over the entire surface of the slab inside its periphery However, this structure can be openwork, it can have a very low cost and its weight remain limited The mechanical cooperation of the two edges gives the slab the sealing properties of moisture penetration and oxygen supply to prevent maintenance of combustion.

  Finally, the modular slab presents the precise

  the dimensions of the latter are defined by the two metal assemblies which are formed and / or stamped with precision and not by an internal structure manufactured, by

for example, by sawing.

  According to a first embodiment, the edges of the two elements are at least partially in contact with each other

  in order to achieve a tight fit.

  According to a second mode of implementation, a peripheral seal is mounted between the edges of the two elements by which

  we obtain a mechanical cooperation between the edges.

  According to a preferred embodiment, the internal structure is openwork It can be at least partially

filled with a filler material.

  It is thus understood that the internal structure provides the mechanical strength required for the vertical loads while the filler material can be chosen to give the structure better resistance to deformation in a horizontal plane and to the modular slab properties of thermal and / or sound insulation, this material may be further adapted to meet the requirements of fire resistance In addition, the choice of material can be guided, for example, by its density in

  depending on the characteristics sought.

  More generally, it is understood that the particular construction of the modular slab, according to the invention, makes it possible to specialize and combine the properties of its various constituent elements, whereas prior solutions, by their global nature, could in no way satisfy

all the requirements.

  Other features and advantages of the present invention will appear more clearly on reading the

  following description of several embodiments of

  the invention given by way of non-limiting examples.

  description refers to the accompanying drawings in which:

  Figure 1 is a top view of a slab according to the invention; Figure 2 is a vertical sectional view along the line II-II of Figure 1; Figure 3 is a top view of a reinforcement structure usable for the invention; Figure 4 shows in vertical section an alternative embodiment of modular slab; Figure 5 shows a preferred embodiment of the upper element of the modular slab; Figure 6 shows an alternative embodiment of the upper element; Figure Ba shows in partial vertical section an alternative embodiment of the edges of the elements of the slab; and Figure Gb shows in vertical section an alternative embodiment of the internal structure; Figure 7, already described, shows a first known example of mounting modular slabs to achieve a false floor; and FIG. 8, already described, shows a second example of mounting the slabs with the installation of a structure of

reinforcing sleepers.

  Referring firstly to FIGS. 1 and 2, a first embodiment of the modular slab according to the invention will be described. It comprises a first element 10 formed by a flat plate 12 provided with a continuous flange 14 which is substantially perpendicular to the plane of the plate 12 The plate 12 with its flange 14 defines the dimensions of the slab so

  for example as 600 x 600 mm in a horizontal plane.

  The slab comprises a second element 16 also constituted by a plate 18 and a flange 20 substantially perpendicular to the plane of the plate 18. As best shown in FIG. 2, the rim 20 of the element 16 is shaped in such a way that it can be introduce the element 16 inside the space limited by the element 10 More generally, the elements forming the modular slab are rectangular, the square shape corresponding only to a preferred embodiment More precisely, according to this mode the two elements are dimensioned in such a way that a tight interlocking is achieved between them in order to achieve mechanical cooperation between the two flanges which stiffens the edge of the slab thus forming a frame. According to a preferred embodiment, the edge 14 of the element 12 is not rigorously perpendicular to the plate 12 but makes an angle with it which is of the order of 95 degrees, or more than It is understood that the presence of this slightly pyramidal rim facilitates the installation of a modular slab compared to adjacent slabs. In addition, the edge 20 of the element 16 could make an angle b greater than 90 degrees with the plate 18 The shape of the seal 30 must be adapted to the inclination of the edges 14 and 20 In addition, preferably, the free edge 20 of the flange 20 is supported on the plate 12 of the element 10 and the free edge 14a of the flange 14 is substantially

  in the same p lan as the external face of the plate 18.

  The interior of the space limited by the elements 10 and 16 is at least partially filled by a preferably perforated reinforcing structure 22 According to a preferred embodiment, the internal reinforcing structure 22 is of the cellular type and is, for example, in accordance with that shown in principle in Figure 3 More specifically, the reinforcing structure is constituted by strips 24, 26 between which are placed strip elements having corrugations such that 28 These strips can be assembled between them by any suitable means, welding, extrusion, gluing, interlocking, etc. This reinforcing structure can be made of metal, plastic material or paper It is thus very light but it has a very high resistance to crushing according to the direction perpendicular to the plane of Figure 3, that is to say in the direction perpendicular to the plates 12 and 18 of the d As the strips forming the structure have generatrices substantially perpendicular to the plates of course, the strips 28 could be replaced by straight strips making

angle with the strips 24, 26.

  More generally, in this embodiment, internal reinforcing structure means a structure consisting of strips whose generatrices are substantially perpendicular to the plates 12 and 18, the strips being joined together according to generatrices and defining

  between them orifices of any shape.

  It goes without saying that other forms of internal structure could be used provided that it gives on the entire surface of the slab the required mechanical strength in the vertical direction and that it is supported on the support frame realized by the mechanical cooperation of the two flanges In particular, instead of a perforated internal structure of the cellular type, one could use a panel consisting of a phenolic resin sandwich of the type marketed by the Italian company MVR under the trademark Fenvierre The material has the required properties of mechanical resistance to vertical loads, thermal insulation, fire behavior and water.

are light.

  It is possible to set up between the facing faces of the flanges 14 and 20 of the two elements of the slab, a layer 30 of a product forming a peripheral seal Depending on the chosen material, the fire behavior of the slab can be improved.

  modular slab and its tightness to the penetration of moisture.

  In this case, of course, the edges of the elements 10 and 16 do not have a tight fit It is the seal 30 which ensures the mechanical cooperation between the two flanges Furthermore, this seal adhering to the edges of the two elements ensures the joining together mutual of these One can also stick the

seal on the edges.

  Preferably, the first element 10 is made by stamping a sheet, for example made of steel. The rim 14 is therefore continuous over the entire periphery of the plate 12. The element 16 can be made from a sheet which is cut out. and folded to form the edge 20 In this case, the flange 20 may have discontinuities of limited dimensions such that 32

  in areas where two flange elements meet.

  Preferably, the sheet used to make both

  elements has a thickness of the order of 1 mm.

  According to another alternative embodiment of the modular slab, it is possible to flow inside the perforated reinforcement structure 22 a filling of a filler material such as plaster, a phenolic resin, etc. The mechanical strength is thus increased. , especially the resistance to deformation in a horizontal plane under vertical load, and the fire resistance of the slab as well as the thermal and sound insulation that it provides Depending on the shape of the internal reinforcement structure and the nature of the material of charge, it is possible to proceed to the injection of the material through one or more orifices provided in the edges or in the plate 12 of the element 10 and which

  can be subsequently refilled.

  FIG. 4 shows an alternative embodiment of the slab. The external element 10 'is identical to the element 10 of FIG. 2 and therefore comprises a plate 12' and a flange 14 'which makes an angle of the order of 950 with the plane of the plate 12 ', or more generally between 90 and 100 The second element referenced 36 is constituted by a flat plate 38 and by flanges 40 which have with respect to the plate 36 an inclination b which is the complement This improves the quality of the interlocking between the two elements 10 'and 36 forming the modular slab. In this case again, elements 10' and 36 are provided inside a modular structure. reinforcement 42 which may be identical to the material 22 of FIG. 3 In this case again, the height or thickness h of the structure is substantially equal to the distance h 'between the plates 121 and 38 when the element 36 is fitted into the element 'The thickness to slab is generally between 25

and 40 mm.

  FIG. 6 shows an alternative embodiment of the edge 20 of the element 16. This is double and obtained by folding an initial edge of suitable width. The two parts 20a and 20b of this edge make it possible to further increase the mechanical resistance to vertical load bending of the periphery of the modular slab. According to another variant embodiment shown in FIG. 6a, the flanges 14 and 20 of the elements 10 and 16 may have a groove respectively projecting 50 and recess 52

  to ensure the fastening by clipping of the two elements.

  Clipping elements could also be punctual.

  This joining can also be obtained by gluing

  ledges or by any other suitable means.

  FIG. 6b shows yet another alternative embodiment of the modular slab. According to this embodiment, the internal space defined by the elements 10 and 16 is filled, on the one hand, by a layer 54, for example, of a plastic material. The thickness of the insulation is, for example, about 7 mm. The rest of the space is occupied, on the other hand, by an internal reinforcement structure 22 of the same type as that which is shown in Figure 3 This structure can itself

  at least partially filled with a filler material.

  In this case, the mechanical cooperation between the structure 22 and the plate 12 occurs via the layer 54. It goes without saying that the layer 54 could also be placed against the plate 18 of the element 16 or that layer of material could

  be placed against each plate.

  It is understood that with such a construction and, in particular, with the fact that the edges of the two elements are in contact over a significant part of their height directly or via a seal, the crush resistance of Slabs are increased on their periphery The internal structure gives the assembly a high stiffening in bending in torsion in the horizontal plane and distributes a large part of the resistance the totality

periphery.

  Inject ur of insulation behavior also l E It can be direct on (mounting sui mechanical to the vertical loads of the periphery on the surface of the slab inside its In addition, because it is perforated, one can yi filler material with thermal and / or phonic properties and fire improvement of the entire slab Celà improves

  i resistance to deformation in the horizontal plane.

  It is self-evident that the modular slabs according to the invention are mounted in accordance with Figure 7 (mounting the columns), or in accordance with Figure 8 a structure of reinforcing sleepers) In the first assembly with slabs according to the invention the same peripheral rigidity is obtained as in the case of the second assembly with conventional slabs since the support frame formed by the flanges of the slabs according to the invention constitutes an equivalent of the reinforcement crosspieces of the assembly of FIG. 8. using the assembly of Figure 8 with slabs according to the invention, it will obtain a mechanical strength to the vertical loads of the periphery of the slabs that was impossible to obtain previously since there is then the equivalent of

  two reinforcing "frames" superimposed.

  Finally, it must be added that the previous description

  more particularly envisaged the use of modular slabs for the realization of false floors However modular slabs according to the invention can also be used to make false ceilings It goes without saying that, in this case, we will choose the parameters of realization slabs according to the characteristics that false ceilings must have, taking into account, in particular, the requirements of mechanical strength less

  high but light weight constraints.

Claims (12)

  1 modular slab for horizontal partition, characterized in that it comprises a first metal element (10) comprising a rectangular flat plate (12) provided with a flange (14) substantially perpendicular to said plate, a second metal element (16) having a rectangular flat plate (18) provided with a flange (20) substantially perpendicular to said plate, the rim of one of said elements being adapted to penetrate the space limited by said plate and said flange of the other element, the mounting being such that the flanges of the two elements cooperate mechanically directly or indirectly to give the support frame thus produced a high mechanical strength to the vertical loads at its periphery, and in that the internal space limited by the two elements is substantially filled by an internal reinforcing structure (22, 42) which cooperates mechanically with the frame and with the two plates, whereby each e faces of said structure is substantially in contact with one of said plates, said structure having a high mechanical strength in the perpendicular direction said plates.   Modular slab according to claim 1, characterized in that the flanges (14, 20) of the two elements (10, 16) are at least partly in contact with each other so as to achieve a tight fit.   3 modular slab according to claim 1, characterized in that between the edges (14, 20) of the two elements (10, 16) comprises a seal member (30) ensuring cooperation mechanical between said edges.   4 Modular slab according to any one of   Claims 1 to 3, characterized in that the mounting of both   elements (10, 16) provide a good seal to the supply of oxygen and / or the penetration of moisture to the internal space. Modular slab according to any one of   Claims 1 to 4, characterized in that it comprises   securing means between them the flanges (14, 20) of the two elements (10, 16).   6 Modular slab according to any one of   Claims 1 to 5, characterized in that the element (10)   the outer rim (14) is obtained by deformation of a metal sheet to obtain said plate (12) and a flange (14)   surrounding all of said plate.   Modular slab according to claim 6, characterized in that the element (10) whose rim (14) is external has a flange forming an angle (a) of between 900   and 1000 relative to said plate (12).   8 Modular slab according to any one of   Claims 1 to 7, characterized in that said element (16) has   an inner rim (20) which is obtained by cutting and bending a metal sheet to provide the rectilinear portions of the flanges. 9 Modular slab according to any one of   Claims 1 to 7, characterized in that said structure   internal (22, 42) is constituted by the assembly of strips of materials whose generatrices are arranged perpendicularly to the plates of said elements.   Modular slab according to claim 9, characterized in that said internal perforated structure (22, 42)   is at least partially filled with a filler material.   11 Modular slab according to any one of   claims 9 and 10, characterized in that said structure   internal reinforcement (22, 42) is metallic.   Modular slab according to claim 10, characterized in that said filler material has   thermal and / or sound insulation properties.   13 Modular slab according to any one of   claims 10 and 12, characterized in that said material of charge is nonflammable.   14 Modular slab according to any one of   Claims 1 to 7, characterized in that said structure   internal portion (42) is constituted by a panel of a material   by a phenolic resin sandwich.   Modular slab according to any one of   Claims 1 to 14, characterized in that said structure of   reinforcement (22, 42) has a thickness in the direction perpendicular to   two plates (12, 18) substantially equal to the distance separating said plates.   Modular slab according to any one of the claims   ú to 14, characterized in that the internal space limited by said elements (10, 16) comprises at least one layer (54) of a material in contact with one of said plates (12, 18) and in that said internal reinforcing structure (22) substantially fills the rest of the space.