Box-type arch bridge splicing section and arch springing section reinforcing method

Abstract

The invention discloses a box-type arch bridge splicing section and arch springing section reinforcing method. According to the splicing section reinforcing method, a fiber woven mesh tensioning unitand an ultrahigh-toughness cement-based material are mainly adopted in a reinforcing area to achieve reinforcing; according to the arch springing section reinforcing method, an FRP net tensioning unit, a bottom layer ECC material and a top layer ECC material are mainly adopted in the reinforcing area to achieve reinforcing; according to the tensioning units of the two reinforcing methods, the number of yarns is increased or decreased; the fiber nets with different cross section areas are woven to meet the requirements of different tensile strength, and the fiber nets can be cut according to the size of the reinforcing area and are tensioned and anchored to the surface of a structure through a clamp; the fiber doping amount of the base material does not exceed 2.5% of the total volume, andthe ultimate tensile strain of the base material stably reaches 1% or above, so that the material has a remarkable strain hardening characteristic, and therefore structural surface cracks are effectively restrained from being developed. According to the reinforcing method, the problem of stress lag of the reinforcing layer can be solved to the maximum extent, the integrity of the reinforcing structure is enhanced, and the durability of the structure is remarkably improved.

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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