Method for reinforcing arch springing section of box by combining fiber woven mesh reinforced ECC with single-side increased section

Abstract

The invention discloses a method for reinforcing an arch springing section of a box by combining fiber woven mesh reinforced ECC (error correction code) with single-side increased section, which mainly uses arch back reinforced concrete, a fiber woven mesh and an ECC material. The arch back reinforced concrete not only remarkably improves the bearing capacity of the structure, but also has a ballasting effect; the fiber woven mesh meets the requirements of different tensile strength by increasing or decreasing the number of yarns and weaving fiber meshes with different section areas; the ECC material fiber doping amount should not exceed 2.5% of the total volume, the ultimate tensile strain should stably reach 1% or above, the obvious strain hardening characteristic is achieved, and structure surface crack development is effectively inhibited. The method is simple in field operation, the bearing capacity of the structure can be effectively improved, the cooperative stress problem of areinforcing layer and an original structure is solved to the maximum extent, the integrity of the reinforcing structure can be enhanced, and the durability of the structure can be 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 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...

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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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