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Device and method for shear reinforcement of concrete box girder web

A technology of concrete box girder and reinforcement device, applied in the direction of bridge reinforcement, bridge, bridge construction, etc., can solve the problems of high stress, insufficient shear bearing capacity, and inclined cracks in the web of concrete box girder, so as to achieve little increase in self-weight. , the reinforcement effect is good, and the effect of reducing the loss of vertical prestress (8)

Active Publication Date: 2020-08-21
BEIJING UNIV OF TECH
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Problems solved by technology

[0007] The purpose of the present invention is to propose external vertical prestressed tendon reinforcement measures for the oblique crack cracking and insufficient shear bearing capacity of the concrete box girder web existing in the existing engineering technology
Effectively solve the problem of excessive main tensile stress of the web

Method used

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  • Device and method for shear reinforcement of concrete box girder web
  • Device and method for shear reinforcement of concrete box girder web
  • Device and method for shear reinforcement of concrete box girder web

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Embodiment Construction

[0031] The following is only one example of the present invention, which can also be used to strengthen other types of box girder webs. Any modification, alteration or equivalent transformation of the above examples according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0032] The present invention will be further described below in conjunction with the drawings and embodiments.

[0033] The box girder in this embodiment is a concrete box girder without ribs, such as figure 1 Including top plate (1), web (2), bottom plate (3). It is characterized in that the reinforcement device is such as Figure 4 Part of the detailed drawing is mainly composed of channel steel (5), L-shaped steel (6), vertical prestressed tendons (8), wedge-shaped steel pads (7), and anti-corrosion coating (12) on the outside of the web. The channel steel is horizontally fixed at the junction of the upper end of t...

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Abstract

The invention relates to an anti-shearing reinforcement device and method for a concrete box girder web. In order to solve the problem that in existing engineering technologies, the concrete box girder web has cracking inclined cracks and insufficient anti-shearing bearing capacity, an external vertical prestressing tendon reinforcement device and method are provided. The device comprises groove-shaped steel, L-shaped steel, vertical prestressing tendons, wedge-shaped steel cushion blocks and an anti-corrosion coating at the outer side of the web. The groove-shaped steel is horizontally fixedto the junction of the upper end of the web and a top plate in the girder length direction. The L-shaped steel (6) is horizontally fixed to the lower end of the web in the girder length direction andis parallel to the groove-shaped steel (5). The vertical prestressing tendons are vertically mounted on the groove-shaped steel and the L-shaped steel, and it is ensured that the vertical prestressingtendons are parallel to the plane of the web. According to the anti-shearing reinforcement device and method, the web is connected with the top plate and a bottom plate through finish rolling twistedsteel, the force transmission path is definite, the risk that web concrete is pulled broken is reduced, and meanwhile, midspan deformation is reduced; the problem of insufficient main tensile stressof the web concrete is effectively solved, and the situations of continuous extension of the inclined cracks of the web or new inclined cracks are prevented.

Description

Technical field [0001] The invention relates to the technical field of reinforced concrete beam reinforcement. In particular, it relates to reinforcement of oblique cracks and insufficient shear capacity of concrete box girder webs and reinforcement methods. Background technique [0002] Box-section beams are widely used in long-span prestressed concrete bridges because of their good bending and torsion resistance. In recent years, serious web slanted cracks have generally existed in the concrete box girder bridges in operation in my country. Even some box girder bridges have just opened to traffic, and the diagonal cracks in the webs have been very significant. The oblique cracks in the web not only reduce the stiffness and strength of the bridge structure, but also accelerate the corrosion of the steel bars, while the rusted steel bars will cause the volume expansion, the concrete cracking aggravated, and further damage the concrete's mechanical properties, reducing the durab...

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 周宏宇麻全周袁慧刘亚南
Owner BEIJING UNIV OF TECH
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