Method for expanding excavation of large-diameter shield tunnel for subway station construction through pile arch wall support

Abstract

The invention relates to a method for expanding excavation of a large-diameter shield tunnel for subway station construction through a pile arch wall support. The method comprises the steps that a single-hole double-track tunnel of a station portion is used as a part of the station structure, pipe segment structures at the bottom and the top of a shield are reserved, and a bottom longitudinal beam, a middle partition wall and a top longitudinal beam of the station structure are constructed; the remaining station structures on the two sides of the shield tunnel are formed through expanding excavation, an air flue at the end of the station is used as a working plane, expanding excavation is carried out on the two sides of the large-diameter shield tunnel by the adoption of a hole pile method, the pipe segment structures on the two sides of the shield are removed in the expanding excavation process, and meanwhile the connection measure between a cast-in-place structure and the remaining pipe segments is taken to form the single-layer double-span side platform subway station. The method for expanding excavation of the large-diameter shield tunnel for subway station construction through the pile arch wall support has the advantages of being definite in stress, reasonable in conversion, convenient to construct and the like.

Description

【Technical field】 [0001] The invention relates to a construction method of a subway station, in particular to a method for constructing a subway station by using a pile arch wall to support and expand and excavate a large-diameter shield tunnel, and belongs to the technical field of rail transit engineering. 【Background technique】 [0002] The shield tunneling method is widely used in subway tunnel construction because of its advantages of high construction efficiency and good effect in controlling ground settlement. The construction of subway tunnels using the shield method and the construction of stations using the open (cover) excavation method are a major mode of subway construction at present. The existing environment will be more complex, and this construction mode faces severe challenges, which are mainly reflected in the following aspects. [0003] (1) It is difficult to coordinate the construction of the section shield and the station [0004] At present, the conv...

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Problems solved by technology

[0003] (1) It is difficult to coordinate the construction of the section shield and the station

[0004] At present, the conventional shield interval tunnels are in the form of two holes and two lines, and the stations are generally constructed by the open cut (cover excavation) method, which has the problem of frequent starting, receiving and U-turning of shield tunnels, and the construction of interval tunnels and stations interferes with each other, restricting Improve shield construction efficiency

[0005] (2) The construction conditions of station open cut are becoming more and more difficult

[0007] (3) It is difficult to arrange double-lane tunnels in narrow road sections

[0008] The use of double-hole, double-track tunnels in the section requires a larger plan underground space, and it is difficult to arrange the double-hole, double-track section lines in areas with narrow roads and dense surrounding buildings.

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