Structural system and process for quick replacement and maintenance of section steel expansion joints

Abstract

The structural system is composed of a prefabricated part and a concrete wet joint, the prefabricated part is composed of a structural steel assembly and concrete, the structural steel assembly is made of E-shaped structural steel, and the concrete is made of C50 steel fiber concrete; the two side faces, the front face and the bottom face of the prefabricated part are wrapped with concrete wet joints, the width of the front concrete wet joint is larger than or equal to 8 cm, and the thickness of the bottom concrete wet joint is larger than or equal to 4 cm. The quick maintenance structure system and process for the section steel expansion joints solve the problems that a conventional maintenance process is long in operation time, slow in concrete strength increase, high in maintenance cost and the like, have the advantages of being quick in construction, reliable in repair quality, economical, applicable and the like, and are extremely suitable for expressway section steel expansion joint maintenance and emergency repair projects; and rapid traffic recovery is facilitated.

Description

technical field [0001] The invention relates to a structural system and a construction process used in the maintenance and repair stage of bridge facilities, in particular to a structural system and a process for rapid replacement and maintenance of steel expansion joints. Background technique [0002] Bridges are a necessary condition for the existence and development of modern cities, and the basic guarantee for residents' life and activities. The quality of their facilities is closely related to everyone's work and life. With the increase of the service life and the increasing traffic flow, the bridge deck section steel expansion joints will inevitably be damaged to varying degrees, among which the fracture deformation of the section steel components and the concrete damage at the anchorage end are the most common diseases, which not only affect the driving comfort, but also It brings severe tests to structural durability and driving safety. [0003] If the steel expansi...

AI Technical Summary

Problems solved by technology

[0003] If the steel expansion joints are replaced and maintained according to the method in the construction stage, the traffic will need to be closed for a long time, which will reduce the traffic capacity of the road, or cause congestion or even safety accidents, which will affect the image of the city

Therefore, in the maintenance and repair stage, the working time is greatly limited. Under such a background, although the maintenance method is basically the same as that in the construction stage, the material has to use rapid concrete, which is expensive and releases a lot of heat during the curing period. Under the interference of traffic load, it is easy to form early micro-cracks, and the durability is poor

In addition, maintenance operations are mostly characterized by small project scales, and rapid concrete is mostly manually mixed on site, making it difficult to control the quality

At the same time, limited by the operating time, on-site maintenance operations had to be simplified. The welding quality of steel bars or the quantity of planted bars could hardly meet the original design requirements. Sometimes the concrete was forced to open to traffic before it was fully cured, resulting in poor construction quality. achieve the desired effect

Judging from the survey on the maintenance quality of several expressway steel expansion joints, it is found that the construction quality guarantee period in the maintenance and repair stage is usually 1 to 3 years, and the service life of some heavy traffic sections is less than 1 year

Although prefabricated parts can simplify the on-site construction process and reduce the working time, the steel expansion joint reinforcement is complicated and the prefabricated installation is difficult, which also restricts the use of prefabricated technology to a certain extent; and if the wet joint concrete is UHPC concrete, the rapid Concrete and other conventional materials not only cannot guarantee the construction quality, but also cannot meet the operation time requirements

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