EP0459924B1 - Fabrication method for isolating and shuttering hourdisstones, device for the execution of this method and hourdisstones obtained thereby - Google Patents

Abstract

The method is characterised in that it essentially consists in inserting, during the moulding, at least one longitudinal profile (2) into the foam during its formation. <IMAGE>

Description

The present invention relates to the building sector, in particular construction elements and in particular the slabs and relates to a method of manufacturing self-formable and insulating slabs.

The invention also relates to a device for the implementation of this process as well as the slabs obtained.

Currently, there are already slabs of synthetic materials, very light, intended to form insulating forms for the realization of floors.

There are also self-supporting and self-supporting polystyrene slabs which are fitted with reinforced concrete stiffeners. These slabs generally allow the realization of a formwork of floors requiring minimal shoring, but have, however, the disadvantage of being relatively heavy and not being able to be practically handled by an operator alone. In addition, the reinforced concrete stiffening element, which is poured into a longitudinal groove provided for this purpose in the underside of the slabs, shows on the latter a trace of different color not allowing to leave the underside of the finished floor. thus obtained without a finishing coating.

Finally, the production of reinforced concrete stiffeners requires a relatively long drying time for these stiffeners, which results in an intermediate storage of the slabs thus obtained relatively long and, as a corollary, requires large storage areas or halls.

DE-B-2 639 812 also discloses a manufacturing process and a machine for implementing this process, making it possible to obtain molded slabs based on polystyrene beads. This process envisages, in fact, a molding of a polystyrene concrete constituted by a mixture of polystyrene beads and cement, the whole being compacted in a mold and a wire mesh being inserted in grooves provided for this purpose, during from the outlet of the molded product from the mold.

This process in no way contemplates foam expansion of a synthetic material, but simply the use of expanded beads or granules in place of gravel.

In accordance with this method, it is therefore possible to produce more or less heavy beams, based on polystyrene, but these beams do not have a stiffening profile integrated in their constituent material, so that their rigidity cannot be ensured, by particular to allow movement on site before pouring concrete, the slab obtained is not load-bearing. To obtain such a load-bearing effect, it is necessary that the receiving groove of the welded mesh is filled with concrete.

The present invention aims to overcome these drawbacks.

It relates, in fact, to a process for manufacturing self-forming and insulating slabs made of foamed synthetic material, in particular of expanded polystyrene, characterized in that it essentially consists of integrating, during the expansion molding of the synthetic material, at least one longitudinal section in the foam in formation and to completely cover it with said foam.

The invention also relates to a device for implementing this process, characterized in that it essentially consists of a continuous or discontinuous molding machine, the mold of which is provided at its rear end with at least a sealed opening for introducing at least one longitudinal profile, by means of introducing the profile or profiles into the mold and, optionally, by a device for continuously producing profiles.

The invention also relates to the slabs thus obtained which are characterized in that they are provided with at least one longitudinal section integrated in their mass.

• la figure 1 est une vue en coupe d'un hourdis conforme à l'invention ;
• la figure 2 est une vue en plan représentant l'implantation du dispositif pour la mise en oeuvre du procédé conforme à l'invention, et
• la figure 3 est une vue en élévation latérale, partiellement en coupe de la machine de moulage.

The invention will be better understood thanks to the description below, which relates to a preferred embodiment, given by way of nonlimiting example, and explained with reference to the appended schematic drawings, in which:

• Figure 1 is a sectional view of a slab according to the invention;
• FIG. 2 is a plan view showing the installation of the device for implementing the method according to the invention, and
• Figure 3 is a side elevational view, partially in section, of the molding machine.

In accordance with the invention, and as shown more particularly, by way of example, FIG. 1 of the accompanying drawings, the method of manufacturing self-forming and insulating slabs 1 made of foamed synthetic material, in particular of expanded polystyrene, essentially consists to integrate, during molding, at least one longitudinal section 2 in the foam in formation and to completely cover it with said foam, so as to allow non-breakage.

According to a feature of the invention, the longitudinal section 2 is made of a thin folded metal sheet.

The longitudinal profile 2 can also be made, in accordance with an alternative embodiment of the invention, of a rigid extruded synthetic material such as PVC or the like.

The invention also relates to a device for implementing this process, shown particularly in Figures 2 and 3 and essentially consisting of a machine 3 for continuous or discontinuous molding, with which the mold 4 is provided at its rear end. at least one sealed opening 5 for introducing at least one longitudinal section 2, by means 6 for introducing the section or sections 2 into the mold 4 and, optionally, by a device 7 for continuously producing sections .

The means 6 for introducing the profile (s) 2 into the mold 4 is advantageously in the form of a movable carriage 8 slidably mounted, in a longitudinal direction, on the frame of the molding machine 3 by means of at least a displacement cylinder 9 and is provided, at its end opposite to said machine 3, with a crosspiece 10 for holding the profile or profiles 2. This maintenance of the profiles 2 is provided either by one or more housings formed on the crosspiece 10 , either by clamps 11 open in the longitudinal direction and actuated by jacks 12. Thus, at the start of the molding of each slab a profile 2 is placed in the corresponding housing of the cross member 10 of the means 6 or is clamped in the corresponding clamp 11 , then pushed into the mold of a length corresponding to a molding cycle. After expansion of the foam, the molded section is pushed out of the mold on the opposite side to the means 6, which simultaneously pushes the stiffening profile or profiles in the mold with a length corresponding to the new section to be molded. These operations are repeated until the desired length of slabs is obtained, the profiles 2 having, in such a case, a length equal to that of the slabs to be obtained. It is also possible, in particular in the case of pliers 11, to carry out a continuous molding of a single slab, the latter being cut to desired lengths of individual slabs at the outlet of the molding machine 3, during a cycle molding, by means of a sawing unit mounted downstream of the machine 3 and not shown.

The device 7 for continuously producing profiles 2 can advantageously be in the form of either a continuous or discontinuous sheet bending machine or an injection molding machine. In the first case, the sheet bending machine can be fed continuously by a thin strip of sheet metal and carry out a continuous folding of this strip or even be fed by sections of sheet metal strips corresponding to a predetermined length of profiles 2.

In the case of embodiment of the device 7 in the form of an injection molding machine, the latter delivers at the outlet of its die a continuous profiled strip.

In accordance with a characteristic of the invention, the device 7 can be provided at the outlet of the profiles 2 with a device 13 for cutting up said profiles 2 to the desired length.

The invention also relates to the slabs thus obtained which are characterized in that they are provided with at least one longitudinal section 2 integrated in their mass.

The longitudinal section (s) 2 integrated into the mass of the slabs 1 may have a very small thickness, which, in practice, is not compatible with a buckling behavior of said sections 2 along their vertical section, this behavior being provided by the material foam forming the mass of the slabs 1, namely, generally polystyrene.

The invention therefore allows the production of reinforced polystyrene slabs having a very low unit weight and which can easily be transported and handled by a single person.

In addition, the slabs thus obtained are perfectly freestanding and therefore require minimal shoring.

Furthermore, because the profiles 2 are integrated into the mass of the slabs 1, the latter have a finish on their perfect underside, this finish possibly being improved by providing moldings, so that subsequent coating of this face becomes useless.

Finally, the process according to the invention allows for production of slabs according to demand, that is to say according to the just-in-time working method, so that stocks after manufacture can be reduced to a minimum, which leads to a gain in productivity and a reduction in the cost price.

Of course, the invention is not limited to the embodiment described and shown in the accompanying drawing. Modifications remain possible, in particular from the point of view of the constitution of the various elements or by substitution of technical equivalents, without thereby departing from the scope of protection of the invention, defined by the claims

Claims (9)

1. Manufacturing process for self-lining and insulating hourdisstones (1) formed from synthetic foam material, in particular expanded polystyrene, characterised in that it consists essentially of integrating, during the expansion moulding of the synthetic material, at least one longitudinal profiled member (2) into the foam being formed and covering it completely with the said foam.
2. Process according to Claim 1, characterised in that the longitudinal profiled member (2) is formed from thin folded sheet metal.
3. Process according to Claim 1, characterised in that the longitudinal profiled member (2) is formed from a rigid extruded synthetic material such as PVC or similar.
4. Device for implementing the process according to any one of Claims 1 to 3, characterised in that it consists essentially of a machine (3) for the continuous or batch expansion moulding of synthetic material, whose mould (4) is provided at its rear end with at least one sealed opening (5) for the insertion of at least one longitudinal profiled member (2), of means (6) for the insertion of the profiled member or members (2) into the mould (4) and, optionally, of a device (7) for the continuous production of profiled members.
5. Device according to Claim 4, characterised in that the means (6) for inserting the profiled member or members (2) into the mould (4) advantageously takes the form of a movable carriage (8) mounted so as to slide, in the longitudinal direction, on the frame of the moulding machine (3) by means of at least one movement ram (9) and is provided, at its end opposite the said machine (3), with a crosspiece (10) for holding the profiled member or members (2).
6. Device according to Claim 5, characterised in that the profiled members (2) are held either by one or more housings formed on the crosspiece (10), or by grippers (11), open in the longitudinal direction and actuated by rams (12).
7. Device according to Claim 4, characterised in that the device (7) for the continuous production of profiled members (2) advantageously takes the form of either a continuous or batch sheet-metal bending press, or an injection press.
8. Device according to Claim 7, characterised in that the device (7) is provided, at the discharge for profiled members (2), with a device (13) for delivering the said profiled members (2) at the desired length.
9. Hourdisstones obtained by implementing the process according to any one of Claims 1 to 3 by means of a device according to any one of Claims 4 to 8, characterised in that they are formed from a moulded expanded synthetic material and are provided with at least one longitudinal profiled member (2) integrated into their mass during moulding.

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