Support-free full-bridge segment prefabricating method based on cantilever balanced assembling

Abstract

The invention provides a support-free full-bridge segment prefabricating method based on cantilever balanced assembling. The support-free full-bridge segment prefabricating method based on cantileverbalanced assembling comprises a segment prefabricating stage and an assembling stage; in the assembling stage, prefabricated piers are assembled at first; then a pier top prefabricated segment is mounted to a pier top and is fixed to the pier top; segments are assembled symmetrically one by one along a bridge span direction by a cantilever assembling method, and when every segment is assembled, prestressing force is applied and thus the segment and a formed portion form a whole body; and finally, after a cantilever is assembled to a midspan, closure is implemented by post-pouring of concrete,and after closure is implemented, continuous prestressing force is tensioned to form the support-free prestressing force concrete continuous rigid frame bridge. By construction processes such as system transformation, a cast-in-situ scheme of a free-support-system bridge is changed into segmented assembling by the cantilever assembling method, the efficiency is improved greatly in the prefabricating stage and the assembling stage, the construction period is shortened, the construction processes are green, and the method is environmentally friendly.

Description

technical field [0001] The invention relates to the field of bridge engineering construction in the transportation infrastructure industry, in particular to a method for prefabricating a full bridge segment without supports based on cantilever balanced assembly. Background technique [0002] Because the general bridge support is damaged or aged, it needs to be replaced, which will affect the operation of the bridge. Therefore, the bridge management unit hopes to avoid the above troubles and try not to use the support. Therefore, the application range of full-bridge unsupported continuous rigid-frame bridges is becoming wider and wider. [0003] At present, the commonly used construction solution for bridges with continuous rigid frame system without supports is the cast-in-place method, that is, the construction is carried out by using the cast-in-place construction technology. The main steps are: erect a full-height bracket under the bridge, then install a formwork on the b...

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Problems solved by technology

[0004] 1. Due to the influence of the outdoor environment, construction techniques such as formwork installation errors, steel bar binding, concrete pouring and outdoor maintenance make it difficult for construction workers to carry out as in the factory; therefore, the cast-in-place scheme has long construction period, poor quality, Defects such as environmental pollution

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