Underground station underground-and-then-open excavation construction method

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 and construction method of an underground station in which the underground station is dark first and then exposed. Background technique [0002] figure 1 , figure 2 Shown is the layout of underground station A and track line B. Existing underground stations are either fully excavated or fully excavated. Since the full open excavation takes a long time and takes up a large area of ​​urban ground space, and the scope of application is very small, full subsurface excavation construction is often used; and full subsurface excavation construction has significantly lower construction efficiency than full open excavation construction. [0003] However, no matter what kind of excavation method, it needs to be opened to traffic after the excavation of the station is completed. At the same time, because underground stations are often close to surrounding structures, a...

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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