A PC box girder web reinforcement structure and method with built-in oblique mesh

Abstract

The invention discloses a PC box girder web reinforcing structure using built-in oblique meshes and a PC box girder web reinforcing method using the built-in oblique meshes. Steel strand meshes wovenfrom longitudinal steel strands, transverse steel strands and diagonal steel strands are placed in webs on the two sides of a semi-finished steel cage which has been tied in the construction process;the sizes of the steel strand meshes and the arrangement distances of the longitudinal steel strands and the transverse steel strands are determined according to the specification of the semi-finishedsteel cage; the contact parts of the steel strand meshes, longitudinal web ribs and U-shaped stirrups and the contact parts of the longitudinal steel strands, the transverse steel strands and the diagonal steel strands are glued and then tied together; the steel strand meshes are anchored to fixing steel sheets; the fixing steel sheets are integrally welded from transverse section steel sheets and longitudinal section steel sheets; after completion of fixing of the steel strand meshes, the tying, formwork erection and concrete pouring of the whole steel cage are completed according to a normal process. The bending resistance and the shearing resistance of an overall structure are enhanced, so that premature structural cracking is avoided.

Description

technical field [0001] The invention relates to a PC (prestressed reinforced concrete) box girder web reinforcement structure and method with built-in oblique mesh, which belongs to the field of structural engineering and also belongs to the field of bridge structures. Background technique [0002] In modern transportation hubs, highway and railway bridges have become lifeline projects. Prestressed box girder is one of the commonly used forms in bridge structure. It is a typical bending, shearing and torsion composite stress member. It mainly has four parts: top plate, bottom plate, web on both sides and flange plate. Under the long-term vehicle fatigue load, the bridge structure will have different degrees of fatigue damage with the increase of service life, especially the half-span to quarter-span web of the box girder, the fatigue damage is particularly serious, often Because the tensile capacity of the web concrete cannot meet the tensile requirements in the actual work...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of premature web cracking in existing box girder bridges in operation, and to provide a method based on the stress mechanism of the box girder web, which can effectively inhibit the premature appearance or development of web cracks, and relieve the cracking of the web. PC Box Girder Web Reinforced Structure with Concrete Fatigue Damage

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