FR2646629A1 - Process for shaping a prefabricated product based on concrete and polystyrene granules - Google Patents

Abstract

A process for shaping a prefabricated product of good homogeneity and of precise dimensional tolerances, the said product being a mixture of concrete and of size-calibrated and surface-treated polystyrene-based granules, characterised in that the mixture of concrete and granules is shaped to the desired shape in a roller press of the type in which the mixture is fed into a mould or form arranged on an endless conveyor belt to which they are fixed, the said machine comprising a means of compressing the mixture passing through it, which means cooperate with counter-support means arranged on the other side of the belt, the means of compression consisting of an assembly of pairs of successive rollers with their axis horizontal, the said rollers respectively forming an upper compression assembly and a lower counter-support assembly relative to the travel of the mixture, the rollers forming the upper compression assembly being staggered vertically relative to one another progressively in the direction of travel of the product, so as to produce progressive compression by a rolling action.

Description

 The present invention relates to a process for the shaping of a prefabricated product of good homogeneity and with precise dimensional tolerances, said product being a mixture of concrete and aggregate based on polystyrene calibrated and surface treated.

 Mixtures of concrete and polystyrene aggregate of this type are known per se.

 They are used on building sites by mixing, as for traditional concrete. They provide efficient and resistant thermal and acoustic insulation. These products are marketed under the registered trademark "BETOSTYRENE".

 On the other hand, it has not yet been possible to find a process making it possible to obtain prefabricated blocks or plates from such products, industrially.

 The invention aims to remedy this drawback.

 In accordance with the invention, a method is indeed proposed for the shaping of a prefabricated product of good uniformity and with precise dimensional tolerances, said product being a mixture of concrete and aggregate based on polystyrene calibrated and surface treated. , characterized in that the mixture of concrete and aggregate is shaped according to the desired shape in a roller press of the type in which the mixture is brought into a mold or a form arranged on an endless conveyor belt of which they are integral, said machine comprising a means for compressing the mixture passing through it cooperating with a counter-pressing means arranged on the other side of the strip, compression means consisting of a set of pairs of successive rollers with horizontal axis, said rolls respectively forming a set of upper compression and a set of lower abutments relative to the path of the mixture, the rollers forma nt the upper compression assembly being offset with respect to each other vertically in a progressive manner in the direction of movement of the product in order to achieve progressive compression by rolling.

 A press of this type is, in itself, known. It was the subject of patent application FR 87 12227 in the name of CITTADINI, a request to which express reference is made.

 It has been found that the application of this press in the processing and shaping of prefabricated BETOSTYRENE products gives completely unexpected results.

 It is indeed possible to obtain in this way a prefabricated product of very great homogeneity and this with dimensional tolerances of the order of a millimeter.

 Thanks to this process, a well-calibrated product is also obtained, BETOSTYRENE retaining its specific qualities, in particular for its applications in the building sector.

 The calibration and conformation of the product by continuous and progressive compression, due to rolling, allows to obtain to an industrial and reliable degree elements of great acoustic, phonic, thermal and resistance qualities, at very competitive cost prices.

 One can obtain by this process all the desired shapes, either in dies or by the use of molds: plates, panels, bars, blocks, etc ...

 Of course, this process makes it possible to provide for the production of composite products with double pass rolling, for example with lightened concrete comprising wood waste.

Claims (2)

1. Process for the shaping of a prefabricated product of good homogeneity and with precise dimensional tolerances, said product being a mixture of concrete and aggregate based on polystyrene calibrated and surface treated, characterized in that the mixture of concrete and aggregate is shaped according to the desired shape in a roller press of the type in which the mixture is brought into a mold or a form disposed on an endless conveyor belt of which they are integral, said machine comprising means for compressing the mixture traversing cooperating with a counter-support means disposed on the other side of the strip, compression means consisting of a set of pairs of successive rollers with horizontal axis, said rolls respectively forming an upper compression set and a counter-support set lower than the path of the mixture, the rollers forming the upper compression assembly being dec bored with respect to each other vertically in a progressive manner in the direction of movement of the product in order to achieve progressive compression by rolling. 2. Method according to claim l, characterized in that it comprises a double pass rolling with a lightened concrete comprising wood waste.