Method for constructing subway station air shaft for soft soil strata

Abstract

The invention discloses a method for constructing a subway station air shaft for soft soil strata, relates to the technical field of underground construction, and aims to solve the technical problems of low construction indirect cost and safe construction without digging the soft soil strata, closing traffic or moving pipelines. The method comprises the following steps: 1) drilling a shaft; 2) casting the shaft wall; 3) filling the outside of the wall; 4) laying reinforcement bars for counter pulling horizontal box culvert; 5) carrying out box culvert horizontal counter pulling construction, namely embedding a plurality of vertical risers for draining on an engineering axial line, counter pulling the horizontal box culvert by using a horizontal counter pulling device, and precipitating by using the riser closest to the forward horizontal box culvert, and removing the riser when the horizontal box culvert is contacted with the riser; and 6) continuing to performing counter pulling on the horizontal box culvert, and repeating the step 5) in cycles until the horizontal box culvert is successfully counter pulled. The method has the characteristics of low construction indirect cost and safe construction without digging, closing traffic or moving the pipelines.

Description

technical field [0001] The invention relates to an underground construction technology, in particular to an underground excavation construction technology suitable for an air shaft of a subway station in a soft soil layer with a high underground water level. Background technique [0002] The cross-sectional area of ​​the exhaust shaft of a general subway station is about 18m 2 , the cross-sectional area of ​​the air inlet shaft is 12-13m 2 According to the depth of the subway station, the depth of the well below the ground is about 15-16m, and both the air inlet and exhaust shafts pass through the horizontal passage (the distance of the horizontal passage is generally not more than 25m, and the specific distance depends on the surrounding environment of the subway station) and the subway The station is connected. At present, the air shaft construction of this type of subway station generally adopts the open-cut method, that is, the air shaft, the underground horizontal pas...

AI Technical Summary

Problems solved by technology

[0003] 1) The municipal pipeline needs to be relocated before excavation. There are many departments and links that need coordination and cooperation, which seriously affects the construction progress; the relocation of the municipal pipeline requires a lot of investment, resulting in waste of resources

[0004] 2) The road needs to be closed before excavation, affecting traffic and residents' travel

[0005] 3) Measures such as foundation pit enclosure and well point dewatering need to be carried out before excavation, which not only increases the cost, but also pollutes the underground space and affects the future development of underground space

[0006] 4) Excavation has a greater impact on the urban environment

[0007] In addition, for soft soil areas with high groundwater levels, how to ensure the safety of underground excavation in a water environment has not been considered.

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