Method for excavating and supporting subway station tunnel by adopting underground excavation construction channel

Abstract

The invention discloses a method for excavating and supporting a subway station tunnel by adopting an underground excavation construction channel, relates to the technical field of tunnel construction, and mainly aims to solve the problems of complicated conversion procedures, high risk, high temporary support consumption and the like in a station tunnel construction method. The method comprises the steps of conversion construction of a main construction channel and a station tunnel, conversion construction of an auxiliary construction channel and the station tunnel and excavation support of the station tunnel; the top of the main construction channel is lifted to be flush with an arch crown of the station, and parallel station entering and portal steel arch frame support are adopted; andthe auxiliary construction channel adopts footage from the station tunnel, relates to the station excavation construction step sequence in the range of the conversion section and support at the connection position of the station tunnel and the auxiliary construction channel. The method aims to solve the problems of complicated construction steps, large construction risk of key sections and more temporary supports in the traditional construction method so as to expect the underground station tunnel construction to achieve safer and more efficient purposes.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a method for excavating and supporting subway station tunnels by adopting a buried construction channel. Background technique [0002] The rapid development of modern cities has led to more and more urban traffic congestion, so it is an inevitable requirement for many large cities and megacities to vigorously develop public transportation, especially rail transportation. For the construction of underground rail transit, in order to avoid more congestion of ground traffic during the construction process and save urban space resources, more and more subway stations are constructed by underground excavation. For example, Shapingba Station, Fengtian Road Station, and Erlang Station of the Chongqing Rail Transit Ring Line. Construction of subway stations using underground excavation method requires the use of underground excavation construction passages to enter the subwa...

AI Technical Summary

Problems solved by technology

[0003] At present, the auxiliary construction channel and the station transition section usually adopt the method of converting from the auxiliary construction channel footage to the station expansion and excavation conversion. This method is more difficult to construct, consumes more temporary supports, is more risky, and has a longer construction period.

It can be seen that the existing construction methods for the main and auxiliary construction passages entering the station tunnel all have problems such as complicated conversion procedures, high risks, high consumption of temporary supports, and lagging construction period. The risk also seriously affected the construction progress of the subway and raised the project cost

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