Fiber woven mesh reinforced ECC combined with single-sided enlarged cross-section method to strengthen box arch foot section

Abstract

The invention discloses a fiber braided mesh reinforced ECC combined with a single-sided enlarged cross-section method for strengthening the box arch arch foot section. The bearing capacity of the structure is improved, and at the same time, it has the function of weight; the fiber woven mesh increases or decreases the number of yarns, and weaves fiber meshes with different cross-sectional areas to meet the needs of different tensile strengths; the fiber content of ECC materials should not exceed the total volume. 2.5%, its ultimate tensile strain should reach more than 1% stably, it has significant strain hardening characteristics, and can effectively inhibit the development of cracks on the surface of the structure. The invention is easy to operate on site, can effectively improve the bearing capacity of the structure, solves the problem of the coordinated force bearing between the reinforcement layer and the original structure to the greatest extent, can not only enhance the integrity of the reinforcement structure, but also significantly improve 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 the foot section of a box arch by combining fiber braided mesh reinforced ECC with single-sided enlarged section. 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. The main arch ring is the main load-bearing member of the arch bridge. Under the action of dead load and live load, in addition to the pressure in the direction of the arch axis, a large negative bending moment will be generated at the arch foot. With the increase of the service life of the bridge, various effects such as vehic...

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 a better method for the reinforcement of arch bridges, especially the reinforcement at the arch foot of box-shaped arch bridges. Therefore, it is necessary to develop new reinforcement technology

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