A method for strengthening the splice section and arch foot section of a box-shaped arch bridge

Abstract

The invention discloses a method for reinforcing the splicing section and the arch foot section of a box-shaped arch bridge, wherein the reinforcement method for the splicing section mainly adopts fiber braided mesh tensioning units and ultra-high toughness cement-based materials in the reinforcement area to realize reinforcement, and the reinforcement method for the arch foot section is Mainly in the reinforcement area, FRP mesh tensioning unit, bottom ECC material and top layer ECC material are used to achieve reinforcement. The tensioning unit of these two reinforcement methods increases or decreases the number of yarns and weaves fiber meshes with different cross-sectional areas to meet different tensile strength requirements. According to the strength requirements, it can be cut according to the size of the reinforcement area, and anchored to the surface of the structure through clamping. The fiber content of the base material should not exceed 2.5% of the total volume, and its ultimate tensile strain can reach more than 1% stably. The material has significant strain hardening characteristics, thereby effectively inhibiting the development of cracks on the surface of the structure. The reinforcing method of the present invention can solve the problem of the force lag of the reinforced layer to the greatest extent, not only enhances the integrity of the reinforced structure, but also significantly improves the durability of the structure.

Description

technical field [0001] The invention relates to the technical field of bridge maintenance and reinforcement, in particular to a method for reinforcing a splice section and an arch foot section of a box-shaped arch bridge. Background technique [0002] Since the 1980s, a large number of reinforced concrete arch bridges have been built in my country, especially in the southwest region. With the rapid development of construction technology and the development of large hoisting equipment and instruments, reinforced concrete box arch bridges have gradually become the dominant bridge type of concrete arch bridges. [0003] The existing reinforced concrete box arch bridges have the following problems: [0004] 1) The main arch ring of box arch bridges is generally prefabricated and assembled in sections, and the construction quality of the spliced ​​section that needs to be processed on site is the most difficult to guarantee. From the test results of several box-arch bridges, mo...

AI Technical Summary

Problems solved by technology

The above two bridge reinforcement cases are not only individual cases but also reflect common problems. In the feedback from the management unit on the reinforcement effect, the applicant found that there is currently a lack of reinforcement for the arch bridge reinforcement, especially the reinforcement of the splicing section and the arch foot section of the box-shaped arch bridge. A better solution, so it is necessary to develop a new reinforcement technology

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