Construction method for ultra-shallow-buried underground excavation subway station construction through flat-roof and upright-wall pipe curtain structure

Abstract

The invention provides a construction method for ultra-shallow-buried underground excavation subway station construction through a flat-roof and upright-wall pipe curtain structure. Large-diameter steel pipes are densely pushed into horizontal and longitudinal positions correspondingly, every two adjacent steel pipes are connected through high-strength bolts and flange plates, and then concrete is poured in the steel pipes and among the steel pipes; and then in the position, below the side edge steel pipes, of the lower portion of a pilot tunnel, poured-in-advance reinforced concrete walls and the side edge steel pipes are connected to enable the reinforced concrete walls to serve as a foundation bed of the overall pipe curtain structure. When station main body construction is not conducted, a large-rigidity support system is formed; compared with a traditional pipe curtain construction method, owing to the fact that transverse bearing force and rigidity of the overall pipe curtain structure are increased/improved, large-cross-section excavation can be achieved; in the excavation process, excessive temporary support systems do not need to erected, the construction period is shortened, and cost is saved; and the support system is the flat-roof and upright-wall structure, and the space utilization ratio is increased.

Description

technical field [0001] The invention relates to a flat-roofed straight-wall pipe-curtain support system formed after pouring concrete with large-diameter dense steel pipes, and a construction method for constructing urban ultra-shallow underground excavation subway stations under the new pipe-curtain support system, belonging to the field of tunnels and underground engineering . Background technique [0002] The pipe curtain construction method was first used in Japan to build a passageway project across the railway. The first use of the pipe curtain construction method in China was in the construction of an underground passage in a city in Hong Kong. After many years of domestic research and successful implementation in engineering, the pipe curtain construction method has matured. However, since the adjacent steel pipes in the traditional pipe curtain structure are only connected by locks, the lateral stiffness and bearing capacity of the overall pipe curtain are relati...

AI Technical Summary

Problems solved by technology

However, since the adjacent steel pipes in the traditional pipe curtain structure are only connected by locks, the lateral stiffness and bearing capacity of the overall pipe curtain are relatively weak. Stability, resulting in slower construction progress

In addition, the transverse section is mostly an arched structure, and the space utilization rate is low

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