Connection method of reserved grouting holes for prefabricated assembled bridge piers

Abstract

The invention relates to a reserved grouting hole connecting method of a prefabricated assembled bridge pier. The method is characterized by including following steps: 1), prefabricating a bridge pier body, arranging a connecting rebar in the bridge pier body during prefabricating, reserving an extending-out portion on the connecting rebar, and fixing an expanding head at the bottom of the connecting rebar; 2), casting in place or prefabricating a bearing platform in a factory; 3), forming a grout outlet, a grout inlet and a reserved grouting hole with concrete hole walls in the bearing platform; 4), hoisting the bridge pier body to space above the bearing platform, and enabling the connecting rebar extending out of the bridge pier body and the expanding head to be inserted into the reserved grouting hole of the bearing platform; 5), injecting a grouting material from the grout inlet of the bearing platform, constantly repeating the grouting process until grout is full to complete connection of the prefabricated assembled bridge pier. In the connecting method, the reserved hole and the connecting rebar are simple to dock, the grouting material is excellent in binding performance, construction speed is high, and connecting reliability is high, and the technical problems that common connecting methods are high in requirements on construction accuracy and technology, a sleeve at a joint is large in rigidity effect and a grouting sleeve or a metal corrugated pipe are prone to rusting are solved.

Description

technical field [0001] The invention relates to the field of bridge and culvert engineering in the transportation industry, in particular to a method for connecting reserved grouting holes of prefabricated and assembled bridge piers. Background technique [0002] With the deepening of the concept of bridge green construction, more and more attention has been paid to reducing the impact of bridge construction on the surrounding environment. The prefabricated assembled bridge piers complete the production of the pier body and cap components in the factory, transport them to the site for assembly, and realize the factory-like, standardized, assembled and rapid bridge construction, greatly reducing the impact of bridge construction on the surrounding environment . [0003] The connection method between prefabricated pier body and cap is the main factor affecting the structural performance and construction efficiency of prefabricated assembled bridge piers. The existing connect...

AI Technical Summary

Problems solved by technology

The existing connection between the prefabricated pier body and the cap mainly includes grouting sleeves and grouting metal bellows. The construction precision is high, the density of grouting is difficult to guarantee, and the production cost of grouting sleeve or metal bellows is high; at the same time, the linear expansion coefficient of grouting sleeve or metal bellows is different from that of grouting material and concrete. , will cause a gap between the grouting sleeve or metal bellows and the concrete cap, which will weaken the anchoring ability of the sleeve or bellows to the connecting steel bars; moreover, during the construction process, the top of the cap is exposed to air or water, and the common connection The metal sleeve or corrugated pipe used in the method is easily corroded by rain and water

Therefore, it is necessary to seek a prefabricated assembled pier connection method that is simple to connect with the connecting steel bar, has excellent bonding performance of the grouting material, strong connection reliability, and fast construction speed, and solves the high construction accuracy and technical requirements of the common connection method and the large stiffness of the sleeve at the joint. Effect is easy to produce cracks and the technical problem of grouting sleeve or metal bellows is easy to rust, it is very necessary

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