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

A technology for strengthening structures and webs, which is applied in the field of structural engineering and bridge structures, can solve problems such as web cracking, achieve the effects of preventing buckling and fracture, being easy to implement, and avoiding secondary construction

Active Publication Date: 2020-09-25
BEIJING UNIV OF TECH
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  • Abstract
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  • Claims
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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

Method used

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

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Embodiment Construction

[0037] For ease of description, the relative positions of the components described below are only based on the actual situation of the structure, which is only an example of the implementation of the present invention, and the present invention is not limited by the following. Any process equivalent conversion or direct application of the content of the present invention is within the scope of patent protection of the present invention.

[0038] 1. Prepare steel strand mesh (2) according to the size of the semi-finished steel cage (1)

[0039] The steel strands used in the steel strand mesh (2) are all made of scored steel strands with a number of steel wires ≥ 3, so that they have high tensile strength and certain bending resistance, so as to increase the wrapping with concrete After the tension is completed, the mesh is prefabricated. take h 0 less than the web-bottom vertical height of the semi-finished reinforcement cage (1), the h 0 Divided into suitable equal parts n ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D22/00E01D2/04
CPCE01D2/04E01D22/00
Inventor 周宏宇袁慧麻全周刘亚南
Owner BEIJING UNIV OF TECH
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