Construction method for excavating station structure by tunnel-first and station-later pipe roof hole pile method

Abstract

The invention discloses a construction method for excavating a station structure by a tunnel-first and station-later pipe roof hole pile method. During construction, four pilot tunnels are arranged onan upper layer and a lower layer respectively, one advanced pilot tunnel is arranged in the upper-layer pilot tunnels, the advanced pilot tunnel is used as a working space for pipe roof piling, and no pipe roof support is arranged above the advanced pilot tunnel and the four lower pilot tunnels; a primary support is arranged and is of a vault straight wall structure, the pilot tunnels serve as working spaces of side piles and middle column steel pipe columns, and after the pipe roof piling is completed, the other three upper pilot tunnels on the upper layer are excavated through a flat-top straight wall structure. The construction method is also suitable for excavation of shallow-buried and deep-buried stations, ensures that environmental facilities are hardly influenced, further saves economic cost, has extremely high economic benefits and social value, and can be widely applied to similar projects.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a construction method for excavating a station structure by tunneling first and then station pipe curtain hole pile method. Background technique [0002] In the construction of urban subway projects, due to the difficulty and slowness of the demolition work in the central area of ​​the city, the demolition and relocation cannot be completed on time. As a result, the construction of the subway station section cannot be started according to the planned construction period, or even seriously lags behind, which affects the realization of the goal of running through the entire line. It is necessary to use The tunnel will be constructed first and then the station will be constructed. Most of the existing construction methods are the tunnel first and then the station combined with the open-cut method or the mine method, but the open-cut method will greatly affect the environmental fac...

AI Technical Summary

Problems solved by technology

[0002] In the construction of urban subway projects, due to the difficulty and slowness of the demolition work in the central area of ​​the city, the demolition and relocation cannot be completed on time. As a result, the construction of the subway station section cannot be started according to the planned construction period, or even seriously lags behind, which affects the realization of the goal of running through the entire line. It is necessary to use Tunnel construction followed by station construction

Most of the existing construction methods are the tunnel first and then the station combined with the open-cut method or the mine method, but the open-cut method will greatly affect the environmental facilities such as underground pipelines and the amount of earth excavation is large, the construction process of the mine method is slow, and the construction period is long. Low degree of mechanization, labor-intensive

Therefore, the tunnel pile method combined with the tunnel first and then the station can solve certain problems. However, the traditional tunnel pile method adopts the form of a vaulted straight wall structure, which can solve the problem of a certain amount of earthwork excavation and has relatively little impact on the superstructure, but there are still problems. Issues affecting environmental facilities such as underground pipelines

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