Construction Method of Full Underground Excavation for Underground Station

Abstract

The invention discloses a full underground excavation construction method for a underground station. The full underground excavation construction method for the underground station includes the stepsof: firstly, performing lower left corner and lower right corner pilot tunnels of a underground excavation cross section; secondly, constructing initial support and secondary lining in the lower leftcorner pilot tunnel and lower right corner pilot tunnel as well as constructing an end base plate, a side wall, an end floor slab, a frame column and an end platform plate, and then completing track laying, power supply and communication to ensure the station to have traffic conditions ahead of time; thirdly, conducting underground excavation of the upper half portion of the station cross sectionand constructing initial support and secondary lining of the upper half portion; fourthly, conducting underground excavation of central geotechnical of the station cross section from top to down; fifthly, constructing a central base plate, a central floor slab and a central platform board of the station cross section. The full underground excavation construction method for the underground stationhas the advantages of guaranteeing the station to have the traffic conditions ahead of time, realizing early opening of a track line before the completion of the underground excavation station, thereby ensuring that that the track line will be put into use as soon as possible, and satisfying people's travel needs.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a full-underground excavation construction method for an underground station. 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 surface excavation or full underground excavation, but no matter which kind of excavation method is used, the station can only be opened to traffic after the excavation of the station is completed. The traditional full underground excavation of underground stations mostly adopts step-by-step excavation methods. Common step-by-step excavation methods include CD method, CRD method, double-side-wall pilot pit method, etc. The step-by-step excavation method has more construction steps, and the overall construction speed is slower. image 3 It is a traditional construction method for underground excavation of underground stations. Pa...

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Problems solved by technology

[0003] Moreover, underground stations are often close to surrounding buildings and structures, sometimes even directly below them. At this time, the construction of the station has a greater impact on the surrounding environment. Therefore, various measures must be taken during construction to reduce the impact on the surrounding environment. slow

[0004] The above reasons directly lead to the slow construction progress of the underground station, but the tunnel must wait until the construction of the underground station is completed before it can be opened to traffic. Therefore, the construction of the underground station often becomes a key node in the construction period and an important restrictive factor for the opening to traffic

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