FR2588905A1 - Self-forming decorative beam - Google Patents

Abstract

Device making it possible to cast reinforced concrete beams without building formwork, having the final appearance of a timber beam or of a stone arch. The formwork making up the external decorative surface is the objective of the invention. The device consists of a box element 1 which is open at the ends in which the reinforcement of the reinforced concrete is laid, which reinforcement is then fastened to cleats 2 intended to prevent the walls from moving apart. In addition, rebates 4 with or without metal inserts 5 are provided in order to receive fixed or movable wood fittings. The device may be made of thermosettable resins reinforced with mineral or synthetic fibres or of thermoplastic materials which may or may not be reinforced.

Description

 The present invention relates to a device allowing t to form ordinary reinforced concrete beams, while having the possibility of saving a lot of time for the implementation and of giving them the external appearance of a wooden beam or a arched lintel in cut stones.

 Conventional forms are generally made using planks which requires a fairly long installation. In addition, the invention gives an ordinary concrete beam a very appreciable aesthetic aspect.

 The device according to the invention overcomes these drawbacks. It consists of a box perfectly imitating a wooden beam or a lintel of stones, the center of this box being hollow so that you can introduce the irons used to reinforce the concrete that will be poured. In addition, small square brackets, pierced with a hole, are used once an iron is passed inside to avoid possible separation of the sides of the self-forming beam, as well as to obtain a concrete-beam connection.more respondent. The fact that the beam constitutes a formwork in itself and that it can, moreover, easily cut to the correct length allows during implementation, an appreciable saving of time. In addition, its lightness makes handling easier.

Its rot-proofness effectively protects concrete from freezing and the appearance of parasitic foam. The aesthetic problems, in particular during the restoration of old houses where it is sometimes necessary to reinforce the structure of these by reinforced concrete beams, the aesthetic aspect therefore, is obvious pat contribution to the raw concrete.

 As soon as the concrete drying period is over, there is no need to formwork as with an ordinary concrete beam. Only the props supporting the self-shuttering beam are to be removed, which again saves considerable time for building professionals.

 According to a variant, movable "cheeks" can be added in order to plug each or one of the ends of the beam, this in order to prevent the subsequently poured concrete from spreading out of the formwork.

The accompanying drawings illustrate the invention:
Figure 1 shows in section the device according to the invention.

 Figure 2 shows in section the same device with the irons intended to avoid the separation of the walls, in place.

Figure 3 shows one of the angles used to support these irons (detached from the beam)
FIG. 4 represents, in perspective, a section of the device according to the invention equipped with rebates.

 The device can be made of sandwich material which will give it the high rigidity it needs.

 This sandwich material will be produced as follows (starting from the outside of the beam towards the inside): polyester resin with glass fibers and aramids, polyurethane foam reinforced with glass fabric and polyester resin with glass fibers and aramids.

 The use of polyurethane reinforced with glass fibers and aramid fibers gives the whole a great rigidity combined with a very light weight.

 The device consists of a box forming a beam imitating wooden frame beams or a row of cut stones and serving as formwork for the pouring of reinforced concrete inside the beam, in which brackets pierced with holes allow thanks to a concrete iron bent into a U shape to avoid a separation of the walls and also to ensure a connection of the concrete with its formwork, the latter remaining definitively after the pouring of the concrete. Made of fiberglass or aramid reinforcement of a polyester or epoxy resin or any other thermosetting or thermoplastic material, it includes one or more rebates allowing to receive a part of fixed or movable joinery, these rebates of which provided with metal or wooden inserts for fixing said carpentry. The brackets intended to avoid the separation of the walls are replaced by stiffening profiles in fiber-reinforced resin and also drilled, so as to be able to possibly receive the U-shaped irons.

Claims (5)

- CLAIMS  1) Self-shuttering beam device characterized in that it consists of a beam-forming box (1) imitating wooden beams or a row of cut stones and serving as formwork for pouring reinforced concrete with inside the beam; in which des3 brackets (2) holes (7) allow thanks to a concrete iron (3)) bent in a U shape to avoid a separation of the walls and also to ensure a connection of the concrete with its formwork, that -this remaining definitively after the concrete has been poured.  2) Device according to claim 1 characterized in that it is made of glass fiber or aramid reinforcing a polyester or epoxy resin or any other thermosetting or thermoplastic material.  3) Device according to claim 1 and claim 2 characterized in that it comprises one or more rebates (4) for receiving a part of fixed or movable carpentry  4) Device according to any one of the preceding claims, characterized in that the rebates intended to receive the fixed or movable joinery parts are provided with inserts (5) made of metal or wood for fixing said joinery works.  5) Device according to any one of the preceding claims, characterized in that the brackets intended to prevent the separation of the walls are replaced by stiffening profiles made of fiber-reinforced resin and also pierced, so as to be able to possibly receive the U-shaped irons. (3).