Narrow site deep foundation pit excavation supporting construction method

Abstract

The invention relates to a narrow site deep foundation pit excavation supporting construction method, and belongs to the field of building construction. The construction method includes the following contents that the depth of a foundation pit is 12.1 m; the depth of underground water in a the foundation pit is 30 m; the depth of underground water outside the foundation pit is 30 m; and the coefficient for importance of a supporting structure is 1.0. The construction method comprises the steps that (1) a soil nailing and anchor spraying method is adopted for slope supporting of the foundation pit; (2) a support pile and anchor cable method is adopted for non-sloping space supporting of a forwarding station and a gallery; and (3) the support pile and anchor cable method is adopted for foundation pit supporting. According to the narrow site deep foundation pit excavation supporting construction method, it is guaranteed that surface water outside the foundation pit does not flow into the foundation pit, accumulated water inside the foundation pit and on a slope face is drained out of the foundation pit in time, and stagnantblocked water on a shallow layer of the side wall of the foundation pit can be smoothly drained out; and a retention wall is arranged on the periphery of the foundation pit, it is guaranteed that rainwater cannot wash the slope, and it is guaranteed that the accumulated water can be drained out in time.

Description

technical field

[0001] The invention belongs to the field of building construction and is suitable for excavation and support of deep foundation pits with narrow and small sites, limited space, complex surrounding building environment and complex engineering geological conditions. Background technique

[0002] In the context of my country's rapid economic development, the construction industry has also experienced leapfrog development. Due to our country's small land and large population, the land per capita is less than 1 / 10 of the world's per capita land. In order to save land, we need housing for space and area for old houses, and many high-rise buildings have sprung up. Appropriate development of multi-storey and high-rise, to the air and underground development, is an important way to solve the shortage of land resources in our country. With the emergence of a large number of high-rise and super high-rise buildings in urban construction, there are more and more deep fo...

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