Underpass tunnel structure for preventing lateral deformation of overpass pile foundation and construction method

Abstract

The underpass tunnel structure for preventing lateral deformation of the overpass pile foundations comprises a tunnel foundation pit and the overpass pile foundations, the tunnel foundation pit is formed between the adjacent overpass pile foundations, the underpass tunnel structure further comprises a tunnel supporting assembly and a pressure guiding assembly, the tunnel supporting assembly is fixedly arranged in the tunnel foundation pit, and the pressure guiding assembly is fixedly arranged in the tunnel foundation pit. The overpass pile foundation is sleeved with the pressure guiding assembly, the tunnel supporting assembly is connected with the pressure guiding assembly, and the pressure guiding assembly is arranged on the outer side of the overpass pile foundation, so that in the tunnel foundation pit excavation process, pressure unbalance of the two sides of the overpass pile foundation is conveniently prevented, and the service life of the overpass is guaranteed; and safe operation of the viaduct in the underpass tunnel construction process is ensured.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to an underpass tunnel structure for preventing lateral deformation of an overpass pile foundation and a construction method thereof. Background technique [0002] The cross-sectional size of urban highway tunnels and the buried depth of the tunnel are both large, so the deep foundation pits of tunnels are generally constructed by the open cut method. However, when the foundation pit is excavated, the foundation pit support structure composed of foundation pit maintenance piles, crown beams and horizontal support beams will have a certain deformation or displacement, which is equivalent to the impact of the foundation pit support structure on the surrounding area of ​​the foundation pit. The lateral pressure of the rock decreases, so the surrounding rock around the foundation pit will move towards the direction of the foundation pit, and cracks and collapses ...

AI Technical Summary

Problems solved by technology

[0003] In view of the above deficiencies, the technical problem to be solved by the present invention is to provide an underpass tunnel structure and its construction method for preventing the lateral deformation of the pile foundation of the overpass, and to solve the problem of lateral deformation of the pile foundation on both sides of the viaduct that occurs in the foundation pit construction of the underpass bridge. The problem of unbalanced pressure ensures the safe operation of the viaduct during the construction of the underpass tunnel

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