A Repairing Structure and Construction Method of Expansion Joint Transition Area of ​​Expressway Concrete Bridge

Abstract

The invention provides a motorway concrete bridge telescopic seam transition area restoration structure and a construction method. The motorway concrete bridge telescopic seam transition area restoration structure and the construction method are characterized in that the restoration structure designed through the construction method is composed of a high-performance wearing layer (1) and a superhigh-toughness self-compacting concrete structure layer (2); the high-performance wearing layer (1) is arranged on the superhigh-toughness self-compacting concrete structure layer (2) in a covering mode; and the superhigh-toughness self-compacting concrete structure layer (2) is internally equipped with a pre-stressed steel stranded wire truss (3). By adoption of the motorway concrete bridge telescopic seam transition area restoration structure and the construction method, comprehensive mechanical performance such as fracture toughness and impact resistance and durability of the motorway concrete bridge telescopic seam transition area restoration structure can be remarkably improved, and the traffic opening time is short.

Description

technical field [0001] The invention belongs to the technical field of highway and bridge construction, and relates to a repair structure and a construction method of a concrete bridge expansion joint transition zone. Background technique [0002] The bridge expansion joint is an important subsidiary structure in the expressway concrete bridge structure, and its structural performance in the transition zone not only has an important impact on the service performance of the bridge structure, but also has a direct impact on driving safety. Therefore, the daily operation and maintenance of the expansion joint transition area of ​​expressway concrete bridges has long been the top priority of the daily work of expressway maintenance management centers around the world. [0003] At present, the repair method adopted for the transition area of ​​the expansion joint of the expressway concrete bridge is mainly: firstly, the original filling material of the transition area of ​​the br...

AI Technical Summary

Problems solved by technology

[0004] (1) Insufficient fracture toughness and poor fatigue impact resistance of the repaired structure

At present, the repair materials used in the transition zone of expressway bridge expansion joints, especially ordinary concrete, have poor fracture toughness and impact resistance, resulting in the repaired structure being unable to withstand the frequent impact of vehicle loads, so that fatigue fractures or impacts often occur prematurely. Damaged, so the bridge had to be closed frequently for renovation

[0005] (2) The interface bonding between the repaired structure and the main beam in the reserved groove in the bridge expansion joint transition zone is very poor

At present, the joint surface between the repaired structure and the main beam in the reserved groove in the bridge expansion joint transition area is mostly not treated or only treated briefly, resulting in the adhesion between the repaired structure and the main beam in the reserved groove in the bridge expansion joint transition area. The knot depends more on the cohesive force of the repair material itself. However, the cohesive force of the repair materials currently used is generally relatively small, resulting in premature debonding, loose peeling, and other damage to the repaired structure.

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