SU1760045A1 - Fittings for solid ferroconcrete slabs - Google Patents

Abstract

Use: as formwork and sheet working reinforcement for monolithic reinforced concrete slabs of buildings and structures. Inventive: reinforcement for monolithic reinforced concrete slabs includes corrugated metal sheets of a rectangular or trapezoid-shaped corrugation profile with protrusions. Moreover, the protrusions are made on the ribs of the corrugations facing the concrete and have a rectangular or trapezoidal shape in cross section, and at the base they have the shape of a polygon. 4 il. sl C

Description

The invention relates to the field of construction and can be used as formwork and sheet working reinforcement for monolithic reinforced concrete floor slabs of buildings and structures.

Known reinforcement for concrete, including corrugated metal sheets with a rectangular or trapezoidal profile of the corrugation with stamps on their walls.

The disadvantage of this reinforcement is the elastic buckling of the walls of the corrugations without transferring concrete of tensile or compressive forces to the walls and shelves of the corrugations, which reduces the bearing capacity of the reinforced structures.

Also known reinforcement for concrete, made in the form of corrugated metal sheets of rectangular or trapezoidal shape of the corrugation with slots, the edges of which are bent in the form of l-shaped projections. However, such reinforcement can be applied only for structures that do not experience large bending loads.

The closest in technical essence is reinforcement for concrete, containing cold-formed corrugated sheets with a rectangular or trapezoidal shape of corrugations with transverse oval protrusions on the wide upper shelves and rectangular stamps on the walls, facing protrusions inward and outward the corrugations.

One of the drawbacks of this reinforcement is the location of local projections in two rows on the walls of the corrugations, which

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reduces the effectiveness of their adhesion to concrete, as the wall at normal stresses bends out of the plane, peels off the concrete, and the protrusions lose contact with it. This can explain the fact that the walls of such flooring, when testing steel-reinforced concrete slabs for transverse bending, worked almost as smooth, without protrusions.

The aim of the invention is to increase the bearing capacity of reinforced concrete slabs by increasing the strength of adhesion of reinforcing profiles to concrete.

This is achieved by the fact that in reinforcement for concrete protrusions on the ribs are facing towards the concrete and have a rectangular or trapezoidal shape in cross section, and at the base of the protrusion - the shape of a polygon.

FIG. 1 shows a profiled sheet with protrusions having a right angled shape at the base; in fig. 2 - the same with protrusions having a multifaceted shape at the base; in fig. 3, 4 is the cross-sectional shape of the projections.

The reinforcement for concrete is made in the form of a bent corrugated sheet and includes the upper 1 and lower 2 edges, walls 3 and protrusions 4. The protrusions A are located periodically along the bending points on the upper and lower edges of the corrugations.

On the upper and lower ribs 1, the protrusions 4 are turned toward the concrete (Fig. 1, 2) and

they have a cross section of a straight molded tongue (Fig. 3) or a trapezoid in shape (Fig. 4). At the base of the projections have the shape of a polygon.

The protrusions on the edges of the profiled sheets are made by cold stamping or continuous molding.

The arrangement of the jaw in the direction of the concrete ensures their stronger adhesion to it under the action of shifting forces, since the strength of the protrusion on the surface is greater than that of the concrete key on the cut.

The many-sided shape of the protrusion allows to increase the area of its adhesion to concrete as compared with oval protrusions, which increases the strength of adhesion of the reinforcing sheet to concrete and as a result also leads to an increase in the bearing capacity of reinforced concrete as a whole.

Claims (1)

Invention Formula The reinforcement for monolithic reinforced concrete slabs, including corrugated metal sheets of a corrugated or trapezoidal shaped corrugation profile with protrusions, is different in that, in order to increase the bearing capacity of reinforced concrete slabs, the protrusions are made on the corrugations facing the concrete and have a cross section rectangular or trapezoidal, and at the base a polygon shape. 3 1 Fig.Z Shgm