Frame bridge jacking construction method

Abstract

The invention discloses a frame bridge jacking construction method. The construction method is characterized in that the construction procedure of parallel construction is adopted for construction of an approach U-shaped groove and a prefabricated jacking frame, the approach U-shaped groove adjacent to the jacking frame serves as a back of jacking construction, and a reinforced concrete back is arranged at the front end of the approach U-shaped groove; the reinforced concrete back, the frame bridge working bottom plate and the concrete working bottom plate of the approach U-shaped groove form a whole during pouring, and the reinforced concrete back is anchored under a cushion layer; the number of sections of the U-shaped groove of the required approach way is obtained through theoretical calculation, and the objective of providing jacking counter force is achieved by adding a counter weight in the U-shaped groove of the approach way; and a post-cast strip with the width of 1 m is arranged between the two sections of approach U-shaped grooves in the rear portion, a water stop belt is embedded after jacking of the frame is completed, and construction of the post-cast strip and the settlement joint is completed. The U-shaped groove of the approach way is used as a jacking back, the number of temporary projects is greatly reduced, project investment is reduced, meanwhile, the U-shaped groove of the approach way and the prefabricated jacking frame are constructed in parallel, and the construction period is shortened.

Description

technical field [0001] The invention relates to a frame bridge jacking construction method, which belongs to the technical field of frame bridge construction. Background technique [0002] At present, when urban roads and highways intersect with railways, they usually adopt the form of overspan and underpass. The cost of overpassing railway bridges is relatively high and is seldom used; underpassing railways are becoming more and more popular due to their better economic benefits and traffic capacity. The more are adopted. The jacking construction of the frame bridge is a relatively common construction technical scheme. It is to prefabricate the bridge and culvert on the side of the railway, and take certain measures to strengthen and protect the existing railway. The back beam provides the reaction force, and the culvert is pushed into place by the jack. This construction technology is more and more used in the construction of railway business lines because it has less im...

AI Technical Summary

Problems solved by technology

The back pile is a temporary project, which needs to be dismantled after the jacking project is completed, resulting in abandoned project and high construction cost, and the back pile affects the implementation of the approach road project of the frame bridge, so the U-shaped groove of the approach road and the prefabricated jacking frame are usually constructed Flowing water construction, resulting in extended construction period

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