Construction method for deep foundation pit excavation of subway station

Abstract

The invention discloses a subway station deep foundation pit excavation construction method, wherein the upper portion of an excavated foundation pit is a sandy gravel stratum, and the lower portion of the excavated foundation pit is a mud rock stratum. The method includes the steps of 1, precipitation construction, wherein precipitation construction is conducted on the sandy gravel stratum through a precipitation well and 2, foundation pit excavation, wherein the foundation pit excavation includes the following steps of foundation pit partition and foundation pit earthwork excavation; the excavated foundation pit is divided into a plurality of small foundation pit bodies to conduct excavation respectively; the small foundation pits comprise first foundation pit bodies and second foundation pit bodies; excavation is conducted on the divided small foundation pit bodies; an open-cut method is adopted for the first foundation pit bodies and the second foundation pit bodies; the first foundation pit bodies are supported by fender posts, reinforced concrete supports and steel pipe inner supports; the second foundation pit bodies are supported by the fender posts, pre-stressed anchor cables and the steel pipe inner supports. The subway station deep foundation pit excavation construction method is simple in step, reasonable in design, convenient to construct, faster in construction process, good in construction effect and capable of easily conveniently and fast to finish deep foundation pit excavation construction process, and the influences on the surrounding environment by the excavation construction process are smaller.

Description

technical field [0001] The invention belongs to the technical field of foundation pit excavation construction, and in particular relates to a method for excavating a deep foundation pit of a subway station. Background technique [0002] With the development of domestic urban rail transit construction, there will be multiple line transfers in subway projects, and the forms of stations are also diverse. Open-cut stations have advantages in terms of investment and progress, but open-cut stations are affected by the surrounding environment. Due to the impact of restrictions and traffic diversion, strong support measures must be taken, especially more special-shaped foundation pits will appear, making the foundation pit support measures and methods of open-cut stations particularly important. Because rail transit construction lags behind urban infrastructure construction, the surrounding buildings where most subway stations are located are becoming more complex and difficult to c...

AI Technical Summary

Problems solved by technology

[0003] At present, there are few materials for reference in the excavation construction of deep foundation pits with complex surrounding environments and poor geological conditions. In actual construction, there is no set of standard and unified construction plans to follow

Images