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A kind of box girder of small curved bridge with high pier and long span in karst area

A large-span, karst area technology, applied in bridges, buildings, etc., can solve the problems of box girder stress state change, box girder web danger, concrete easily squeezed out, etc., to improve crack resistance and ensure stress safety. , The effect of reducing box beam cracks

Active Publication Date: 2019-07-23
CHINA COMM NORTH ROAD & BRIDGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to provide a box girder of a small curved bridge with high pier, large span, and small curved bridge in the karst area, so as to solve the problem that the existing box girder has a change in the stress state of the box girder due to the change of the curvature of the bottom plate of the box girder, so that the concrete is easy to be squeezed out. , it is very easy to cause dangerous problems in the box girder web

Method used

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  • A kind of box girder of small curved bridge with high pier and long span in karst area
  • A kind of box girder of small curved bridge with high pier and long span in karst area
  • A kind of box girder of small curved bridge with high pier and long span in karst area

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Embodiment Construction

[0020] Embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art would recognize that the described embodiments can be modified in various ways or combinations thereof without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Also, in this specification, the drawings are not drawn to scale, and like reference numerals denote like parts.

[0021] Combine below figure 1 with figure 2 This embodiment will be described in detail.

[0022] figure 1 It is a schematic cross-sectional view of the box girder of the high pier, large span and small curved bridge in the karst area of ​​the present invention, figure 2 yes figure 1 A schematic diagram of the longitudinal section of part A, such as figure 1 with figure 2 As shown, the box girder of the high pier, large span and small cur...

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Abstract

The invention discloses a bridge box girder with high piles, a large span and low tortuosity in a karst area. The bridge box girder includes a top plate and a web, a transverse prestress steel beam isarranged on the upper brim of the top plate, vertical prestress steel beams are arranged along the web, longitudinal prestress steel beams are arranged in the web, and U-shaped anti-falling reinforcing bars are arranged in the web in the vertical direction and fixed with the vertical prestress steel beams to resist an additional radial force generated when the prestress steel beams are tensioned.Hoops are arranged along the outer sides of the vertical prestress steel beams and used for bearing transverse bending moment generated in the process of applying prestress, and the density of the hoops gradually increases from the junction between the top plate and the web to a chamfer of the web. The additionally arranged anti-falling reinforcing bars and hoops can improve the antifracture performance of the whole box girder body and ensure the stress safety of a large-span curved bridge.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a box girder of a small curved bridge with high piers and large spans in a karst area. Background technique [0002] The karst area refers to the special landform formed by the long-term dissolution of soluble rocks such as limestone and dolomite by corrosive water. In the karst area, due to karstification, the structure of the rock mass changes, resulting in a decrease in the strength of the rock and an increase in permeability, which usually easily causes problems such as insufficient bearing capacity of the foundation, collapse of the roof of the underlying karst cave, ground collapse, and uneven settlement of the foundation. It has a great impact on project construction and use. [0003] For the construction of small curved bridges with high piers and long spans, whether it is cast-in-situ box girder or prefabricated box girder, there are often cracks in differen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D2/04
CPCE01D2/04
Inventor 黄增财刘丹娜殷胜光邵文泽
Owner CHINA COMM NORTH ROAD & BRIDGE
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