Method for constructing super-shallow-burial subway station under transverse canopy erected inside micro pilot tunnel

Abstract

The invention discloses a method for constructing a super-shallow-burial subway station under a transverse canopy erected inside a micro pilot tunnel. The method is applicable to underground space design and construction. On the underground excavation condition, a large underground structure of a flat-roofed straight wall is can be constructed in a super-shallow-burial mode; construction methods frequently used for underground space are an open excavation method, a cover excavation method and a subsurface excavation method. Compared with the open excavation method and the cover excavation method, breakage of a current ground is avoided, and influences on traffic and pipelines are small. Compared with the subsurface excavation method, the requirement for the soil covering thickness is small, deep burying caused by underground excavation of the underground space is avoided, meanwhile, working procedures are easily switched, and the investment is small. Compared with a pipe roof method, the method is more suitable for present construction environment in China. According to the method, a micro pilot tunnel is formed at the certain depth underground, the canopy structure is erected in the micro pilot tunnel, and reverse building method construction of underground structures such as a station is performed under the protection of the canopy.

Description

technical field [0001] The invention is suitable for the design and construction of large underground spaces, especially for the construction of subway station structures. In the case of underground excavation, a large-scale underground space structure with a flat roof and straight walls can be buried ultra-shallow, avoiding the impact of underground structure construction on ground traffic and pipelines, and avoiding the large elevation difference caused by the excessive buried depth of the traditional underground excavation method. Deeply buried groundwater treatment problems. At the same time, it is suitable for the construction of underground space structures under deep burial conditions. Background technique [0002] At present, the known construction methods of the underground space include the open-cut method, the cover-excavation method, the underground excavation method and the pipe curtain construction method. Both the open cut method and the cover excavation met...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for constructing an ultra-shallow underground excavation subway station structure, which overcomes the shortcomings of the existing subway station construction methods, solves the problem that the open-cut method and cover-excavation method have a great impact on traffic and pipelines, and the preliminary engineering is uncontrollable Solve the problems of high earth cover, large structure buried depth, difficult groundwater treatment, large project investment, complex process transformation, low construction efficiency and large deformation of the underground excavation method; The jacking process is complex and difficult to adapt to the current domestic engineering construction environment

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