CH345140A - Lost formwork element - Google Patents

Description

  

      Disposable formwork element The present invention relates to a lost formwork element, for the manufacture of floors, walls, etc., in reinforced concrete. This element is charac terized in that it is constituted by a water-repellent plasterboard, the compressive strength of which is at least 250 kg / cm- 'and the tensile strength of at least 60 kg / cm. -, this plate being intended to be sealed in the poured concrete, and having a finished face intended to be visible in the finished construction.



  The single figure of the accompanying drawing represents, by way of example; an embodiment of the lost formwork element for the construction of a floor.



  In this drawing, 1 designates the lost casing elements each consisting of a water-repellent plasterboard of high mechanical strength, that is to say with a compressive strength of at least 250 kg / cm2 and to traction of at least 60 kg / cm2. The elements 1 which may be square in shape each have a finished face 2 intended to be visible in the finished construction shown, where these elements constitute a ceiling.



  Face 3 opposite to finished face 2 has wire flanges 4 embedded in the plaster. Bevels 5 and 6 are formed on the lower sides and respectively on the upper sides of each element 1, these bevels making it possible to obtain better contact between the adjoining faces 7 of two juxtaposed elements. 8 denotes a concrete slab forming the floor proper and in which the elements 1 are sealed as shown.



  For the manufacture of a floor, several elements 1 are juxtaposed and maintained contiguously in a horizontal plane. To this end, these elements are placed with their finished faces facing downwards, on a temporary horizontal support formed, for example, of boards or squares supported by props in the usual way. Concrete is then poured onto the faces 3 of the elements to form the slab 8 (the reinforcement of which has not been shown), the concrete penetrating into the bevels 6 of the upper edges and thus fixing the elements 1 over their entire periphery. .



  Thanks to the water-repellent properties, plaster constituting the elements. 1, these are not disturbed by the humidity of the concrete as would be the case with ordinary plaster elements. On the other hand, the high mechanical strength of the elements 1 allows them to withstand the concrete load without it being necessary to support them over their entire surface, which simplifies the assembly of the formwork.



  The element described, which is made of an inexpensive material, makes it possible to manufacture, in a very economical manner, reinforced concrete floors with an underlying ceiling, the outer surface of which has its definitive appearance, that is to say does not require application of gypsum or other subsequent covering.



  The visible face of the elements 1 can be smooth or have decorative patterns and the bevels 5 which give the ceiling an aesthetic appearance can be of any desired size and shape. One could also eliminate the lower bevels 5 to have contiguous sides over the entire surface of the ceiling.

 

Claims (1)

CLAIM Disposable formwork element, for the manufacture of floors, walls, etc., in concrete, characterized in that it consists of a hydrofuge plasterboard and whose compressive strength is at least 250 kg / em2 and tensile of at least 60 kg / cm ?, this plate being intended to be sealed in the poured concrete, and having a finished face of the tines to be visible in the finished construction. SUB-CLAIMS 1. Element according to claim, characterized in that said plate has on the face opposite the finished face means for anchoring the plate in the poured concrete. 2. Element according to claim and sub-claim 1, characterized in that said anchoring means comprise wire clamps embedded in the plaster.