Method for building crossover large section by arranging vertical shaft above underground excavation section of subway

Abstract

The invention discloses a method for building a crossover large section by arranging a vertical shaft above a subway underground excavation section. The method comprises the following steps that the vertical shaft is excavated, and a vertical shaft primary support is constructed; constructing a primary support and a temporary inverted arch of the transverse channel; excavating an interval standard section in the vertical shaft; constructing lining structures of the vertical shaft and the transverse channel; excavating an interval standard section in the transverse channel; excavating the cross section of the crossover in the transverse channel; excavating crossover sections in the vertical shaft and the transverse channel; and after construction of the interval tunnel structure is completed, the vertical shaft ground structure is broken, soil is backfilled, and the road surface is recovered. The problems that traditional crossover construction is high in risk, complex in procedure and large in influence on cities are solved. The vertical shaft and interval tunnel combined construction structural form is adopted, the length of the transverse channel can be reduced, the construction progress of the transverse channel can be accelerated, the engineering investment can be reduced, the crossover excavation requirement is met, meanwhile, the influence on the urban ground surface can be reduced, structural stress conversion is stable, the construction step sequence is 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 design of the crossover in the underground excavation section, one is to select a suitable position to constru...

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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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