Construction process of double-layer jacking culvert penetrating through existing railway lines

Abstract

The invention discloses a construction process of a double-layer jacking culvert penetrating through existing railway lines. The construction process includes the following steps: (1) precasting of an upper-layer bridge culvert body, (2) construction of a back and a back beam used for jacking of the upper-layer bridge culvert body, (3) reinforcement of the existing railway lines, wherein the existing railway lines are reinforced through a line overhead reinforcing structure, (4) digging of a jacking pit of the upper-layer bridge culvert body, (5) jacking of the upper-layer bridge culvert body, (6) construction of a bottom supporting system of the upper-layer bridge culvert body, (7) detachment of the line overhead reinforcing structure, (8) precasting of a lower-layer bridge culvert body, (9) construction of a back and a back beam used for jacking of the lower-layer bridge culvert body, (10) digging of a jacking pit of the lower-layer bridge culver body, (11) jacking of the lower-layer bridge culvert body, and (12) concrete pouring, wherein after the lower-layer bridge culvert body is jacked properly, concrete is poured between the upper-layer bridge culvert body and the lower-layer bridge culvert body. The method is simple, reasonable in design, low in investment construction cost and good in using effect, the construction process of the double-layer jacking culvert can be easily, conveniently and quickly finished and is high in quality, and the construction process is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of jacking bridge and culvert construction on existing lines, and in particular relates to a construction technique for double-layer jacking culverts crossing existing lines. Background technique [0002] The construction of jacking culvert is to push the prefabricated box culvert into place under the premise of solid foundation. Specifically, under the condition of uninterrupted driving, dig a jacking well beside the existing line and prefabricate the box culvert in the well, and then use large The power jack set pushes the box culvert under the existing railway line. Existing line jacking bridges and culverts refer to culverts or interchanges (tunnel bridges) that pass through existing railways, and adopt bridge and culvert structures, also called box culvert jacking. Box culvert jacking can be divided into box bridge jacking and small culvert tube jacking. The box bridge jacked is generally a single-hole...

AI Technical Summary

Problems solved by technology

The above-mentioned advantages of bridge and culvert jacking construction are only applicable to the jacking construction of single-story and small structures with good geology, and cannot solve the problem of double-layer jacking and single-story larger-sized structures. In the process of layer jacking construction, the impact of the upper bridge and culvert on the existing railway, the stability after the jacking is completed, and the impact of the lower bridge and culvert on the upper structure system, it is urgent to design a double-layer bridge that crosses the existing line. Jacking culvert construction technology

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