A method for setting up a shaft above the underground excavation section of a subway to construct a large cross section

Abstract

The invention discloses a method for arranging a shaft above an underground excavation section of a subway to construct a large cross-section, comprising the following steps: excavating a shaft and applying initial support for the shaft; applying initial support for a transverse passage and a temporary inverted arch: excavation The standard section of the section in the shaft; the lining structure of the shaft and the cross channel is constructed; the standard section of the section in the excavation of the cross channel; the section of the cross section of the excavation of the cross channel; the section of the cross section of the excavation of the shaft and the cross channel; after the construction of the section tunnel structure is completed , Break the shaft out of the ground structure, backfill the covering soil, and restore the road surface. The invention solves the problems of high construction risk, complicated procedures and great influence on the city of traditional crossing lines. The invention adopts the structure type of the vertical shaft and the interval tunnel, which can reduce the length of the transverse passage, speed up the construction progress of the transverse passage, and reduce the project investment, so as to meet the excavation requirements of the crossing line, and at the same time, it can reduce the impact on the urban surface. In addition, the force conversion of the structure is stable, the construction steps are simplified, and the construction risk is reduced.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a method for arranging a shaft above an underground excavation section of a subway to construct a large cross section. Background technique [0002] With the rapid development of rail transit in my country, the scale of urban subway network construction has continued to expand, and the construction design of shallow buried, large-span, variable-section tunnels such as turn-back lines and crossing lines in subway sections is increasing. [0003] The section of the shallow buried undercut of the interval crossing line is relatively large, and the subsection excavation will disturb the soil for many times, making the land subsidence difficult to control, the construction organization is difficult, and the construction risk is high. In the traditional crossover design of the undercut section, one is to select a suitable position to construct the shaft on one s...

AI Technical Summary

Problems solved by technology

[0003] The shallow buried excavation section of the interval crossing line is relatively large, and the subdivision excavation will disturb the soil many times, making it difficult to control the land subsidence, construction organization is difficult, and construction risk is high

In the design of the crossing line in the traditional underground excavation section, one is to select a suitable location on the side of the ground section for the construction of the vertical shaft, excavate the cross passage perpendicular to the section tunnel, wrap the largest section of the crossing line in the cross passage, and then use the construction passage as an auxiliary tunnel Excavating the main body of the interval, this construction method needs to occupy the construction shaft structure on one side of the interval, which has a greater impact on the surrounding structures of the interval; Frequent changes from small to large and from large to small, the structural force conversion is very complicated, which brings great difficulty to the construction

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