Excavation construction method of dark first and then bright in underground station

Abstract

The invention discloses an underground station underground-and-then-open excavation construction method. The underground station underground-and-then-open excavation construction method comprises thesteps that 1, lower left corner guiding holes and lower right corner guiding holes of the cross section of a station are subjected to underground excavation; 2, primary supports, secondary linings, end bottom plates, side walls, end floor slabs, frame columns and end platform plates are constructed in the lower left corner guiding holes and the lower right corner guiding holes, and then track laying, power supplying and communicating are completed; 3, unprotected open cut excavation is conducted above the station till the positions of the end floor slabs of the station are reached, and centralrock soil between the lower left corner guiding holes and the lower right corner guiding holes is excavated; 4, central bottom plates, central floor slabs, central platform plates and a vault of thecross section of the station are constructed; and 5, backfilling is conducted above the station. The station meets the open traffic condition in advance, and advanced open traffic is achieved before underground excavation construction of the underground station of a track line is completed; and the whole construction period of the underground station is shortened, the construction efficiency is improved, the time of city ground occupying is reduced, and the advantages of full open excavation and full underground excavation are both taken into consideration.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to an excavation construction method in which an underground station is first darkened and then brightened. Background technique [0002] figure 1 , figure 2 Shown is the layout of underground station A and track line B. Existing underground stations either adopt full underground excavation or full open excavation. Since full open excavation takes a long time and occupies a large area of ​​urban ground space, the scope of application is very small, so full open excavation construction is mostly used; compared with full open cut construction, the construction efficiency of full open excavation construction is significantly lower. [0003] But no matter which kind of excavation method, it is necessary to open to traffic after the excavation of the station is completed. At the same time, since underground stations are often close to surrounding buildings and structures...

AI Technical Summary

Problems solved by technology

Since full open excavation takes a long time and occupies a large area of ​​urban ground space, the scope of application is very small, so full open excavation construction is mostly used; compared with full open excavation construction, the construction efficiency is significantly lower

[0003] However, no matter which excavation method is used, it can only be opened to traffic after the excavation of the station is completed.

At the same time, since underground stations are often close to surrounding buildings and structures, and sometimes even directly below them, various measures need to be taken during construction to reduce the impact on the surrounding environment, which will also lead to slow construction progress

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