SU922257A1 - Reinforcement structure for ferroconcrete girders - Google Patents

Description

(54) STRUCTURE STRENGTH CONSTRUCTION

I

This invention relates to the reinforcement of used building structures, for example, reinforced concrete beams.

In the practice of operation of reinforced concrete beams, there is a need to strengthen them due to the anticipated increase in loads or due to detected defects.

The closest in technical essence is the design of reinforcement of reinforced concrete beams, consisting of a pre-stressed two-legged trussed hook 13.

As a result of the application of prestressed puffs, the usual bending element becomes eccentrically compressed, and additional bending moments are created on onojaax, which, in turn, significantly reduce the initial transit moments.

The known construction of reinforcement of reinforced concrete beams of plates has oi- BALOK

limited application possibilities. It is not applicable for beams that have serious defects in the compressed zone, chipped shelves, cracks, reduced concrete strength, as well as in the curvature of the entire beam from the deplanation plane ..

The aim of the invention is to increase the carrying capacity of reinforced concrete beams.

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The goal is achieved by the fact that in the reinforcement of reinforced concrete beams, consisting of a pre-stressed two-branch shear hook,

ts the compressed zone is provided with an additional two-legged element in the form of angles located at the ends of the beam with shelves facing outward, connected along the top of the beam by profile

20 short ones, and at the bottom are covered collars, with the ends of the hooks attached to the vertical shelves of the corners. Fig. 1 shows the structure of a spherical reinforcement with an additional element working in compression mounted on a gable reinforced concrete beam; in Fig. 2 - section A-A in Fig. 1 Reinforced reinforced concrete beam 1 with a tension-loaded shredded puff 2 at nodes 3 fastens to an additional element working in compression, a 5-strand device of both branches of a puff, 6,7,8 — a connection of an additional compressed element to maintain stability, made in the form of a yoke, in this case from a bar, channel, plate and nuts . The force Q in the tension clamp 2 resulting from the tightening of both branches of the clamp 5 with the device 5, in the node 3 decomposes into a reactive component B perceived by the support, and component D perceived by the element C, resulting from this force Q in the beam span serve as intermediate supports unloading the beam. The magnitude of the force Q is calculated depending on the actual bearing capacity of the concrete beam. The use of the proposed reinforcement construction provides, in comparison with the known solution, an expansion of the field of application, since it is possible to reinforce reinforced concrete beams that have defects in the compressed zone by transferring the force from the transverse tightening to an additional compressed element, and for which a replenishment is required. bearing capacity of more than 50, and the achievement, when compared with the design of reinforcement in the form of a truss, due to the absence of lattice elements and a high degree of inclusion in the work of all elements, saving more than 30% metal. Claims for reinforcing reinforced concrete beams, consisting of a prestressed TWO-branch shprengelnaya tie, characterized in that, in order to increase the carrying capacity, the beam in the compressed zone is provided with an additional two-branch element in the form of angles located along the ends of the beam with the shelves facing outward, connected along the top of the beam by shaped shorter ones, and at the bottom with surrounding clamps, with the ends of the puff attached to the vertical shelves of the corners. Sources of information taken into account during the examination 1. Onufriev N.М. Strengthening of reinforced concrete structures of industrial buildings and structures, L.-M., Stroyizdat, 1965, SLS (prototype).

Claims (1)

Claim 15 The reinforcement structure of reinforced concrete beams, consisting of a prestressed two-branch truss tightening, characterized in that, in order to increase the bearing capacity, the beam in the compressed zone is equipped with an additional two-branch element in the form of angles located at the ends of the beam with the shelves facing outward, connected at the top of the beam shaped shorts, and on the bottom covering clamps, and the ends of the puff attached to the vertical shelves of the corners. *. V 'Sources of information taken into account in the examination 1. Onufriev N.M. Reinforcement of reinforced concrete structures of industrial buildings and structures, L.-M ,, Stroyizdat, 1965, p.134 (prototype). Aa FIG. 2