LU84596A1 - PROCESS FOR PRODUCING A COMPOSITE BEAM AND BEAM PRODUCED ACCORDING TO THIS PROCESS - Google Patents

Description

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The present invention relates to a method for producing a composite beam having the advantages of speed and ease of execution both on site and in the workshop, without expensive tools, using a hand. non-specialized work.

The method according to the invention consists in using jointly as formwork and as reinforcement a metallic exterior covering and filling this covering with concrete.

This method of producing a composite beam has, compared to the current manufacturing method, the advantage of providing a beam executed from a self-supporting and resistant metal formwork, placed on its final supports and which can resume on its own. the dead weight of the concrete. This formwork acts as a reinforcement collaborating with hardened concrete during commissioning; it assumes the roles of tensile reinforcement, compression and resumption of cutting forces.

The metallic exterior cladding also provides greater resistance and rigidity than those obtained by a reinforced concrete beam of the same dimensions, produced by the current execution process.

According to the invention, the metal outer covering or metal shuttering element is made in the shape of a U, from two cold-folded sheets in the shape of an L, juxtaposed and secured.

Other details and particularities of the invention will emerge from the description which follows, on the basis of the appended drawings, by way of example only, showing in:

Figure 1 a cross section in a metal shuttering element of a composite beam according to the invention; - 3 -

Figure 2 a longitudinal section in said shuttering element, along line 2-2 of Figure 1;

Figure 3 a horizontal section in said shuttering element, along line 3-3 of Figure 1;

Figures 4 and 5 respectively a side view of a spacer bar of the walls of the shuttering element and a section through 5-5 of Figure 4;

Figure 6 a cross section of the composite beam according to the invention, after concreting and making a possible collaborating slab.

As can be seen in the drawings, the beam consists of a metal formwork made of two folded sheets 1, of a connecting clips 2, of spreader bars 3 "of possible connection 4 and reinforcement bars 5 and a concrete mass 6.

The two sheets 1 bent into an L shape, juxtaposed, clipped in 2 and held at a distance by the spreader bars 3 form a metal formwork (Figure 1), into which the mass of concrete is poured.

The folded sheets 1 are formed by cold bending, which increases the elastic limit of the steel by work hardening.

Each profiled sheet 1 has longitudinal stiffeners formed by the folding of the sheet and located at the bottom at 7 and on the vertical walls at 8. These spokes provide stiffness and resistance under the action of the dead weight of the concrete and, thereafter, under permanent and operating charges. The stiffeners 8 are provided with regular punches 9 vertically aligned. These punctures have a multiple role, namely: - ensuring the steel-concrete connection by the formation of concrete studs; - allow the fixing of the spacer bars 3; - 4 - - allow the placement of connection bars 4 with a possible collaborating slab 10.

After pouring and hardening of the mass concrete 6, a reinforced beam is obtained for the recovery of moments and sharp forces by the profiled sheets of formwork 1.

the performance of the beam thus produced can be increased by the collaboration of a reinforced concrete compression slab 10 linked to the beam by the connection bars 4 or of a composite steel-concrete floor of the "Floor-Kit" type and / or by simple installation, at the bottom of the formwork, reinforcing bars or concrete bars 5 placed on supports 11.

Claims (8)

1. A method of producing a composite beam, characterized in that it consists in jointly using as formwork and as reinforcement a metal outer covering and filling this covering with concrete. 2. Method according to claim 1, characterized in that it consists in having inside the metallic covering of the spreader bars to keep its vertical walls at a distance. 3. Method according to claim 1, characterized in that it consists in having inside the metal covering of the projecting connection bars for the connection with a collaborating slab. 4. Method according to one or more of claims 1 to 3j, characterized in that it consists in making the metal outer covering or shuttering element in the shape of a U from two cold-folded sheets in the shape of 1, juxtaposed and secured . 5 # A method according to claim 4, characterized in that it consists in providing longitudinal stiffeners, formed by the folding of the sheet and located on the one hand at the bottom and on the other hand on the vertical walls of the shuttering element , 6. Method according to claim 5, characterized in that it consists in making in the stiffeners of the walls punctures, at regular intervals and vertically aligned, these said punctures allowing the formation of concrete studs and used for the placement of spreader bars and connection bars. 7. Method according to one or more of claims 1 to 6, characterized in that it consists of having concrete rods placed on supports in the bottom of the formwork element. 8. Composite beam in folded sheets, produced according to the process described in one or more of claims - 6 - 1 to 7 and shown in the accompanying drawings, V.