Foundation Pit Support Method with Vertically Variable Stiffness Support Body

Abstract

The present invention proposes a foundation pit supporting method of a vertically variable stiffness support body, comprising the following steps: S1, setting up a vertical body assembly: the bottom end of the vertical body assembly is sequentially arranged from the side to be excavated of the foundation pit to the outside Vertical body Ⅰ, vertical body Ⅱ, vertical body Ⅲ, vertical body Ⅳ and vertical body Ⅴ are formed; the tops of vertical body Ⅰ, vertical body Ⅱ and vertical body Ⅴ are all flush with the ground; The distance between the top of vertical body III and the top of vertical body II is h1, the distance between the top of vertical body IV and the top of vertical body III is h2, and the distance between the top of vertical body IV and the excavation surface of the foundation pit is h3; S2, Set up the buttress assembly; the buttress assembly includes buttress I and buttress II; the top of buttress I is flat with the excavation surface of the foundation pit; buttress II is located below buttress I and connects with vertical body I; buttress II The bottom of is equal to the bottom of the vertical body assembly; S3, a foundation pit with a depth of H excavated downward from the ground. Using the above method to support foundation pit can reduce engineering cost and improve construction efficiency.

Description

technical field [0001] The invention relates to a method for supporting a foundation pit in the field of civil engineering, in particular to a method for supporting a foundation pit for a vertically variable rigidity supporting body of a soft soil foundation. Background technique [0002] For foundation pits in soft soil, when the excavation depth is greater than 7m, gravity-type cantilever support structures cannot be used, and internal supports must be used to resist the earth pressure acting on the vertical support body. The internal support system consists of column piles, columns and horizontal support beams, which increases the project cost and reduces the excavation efficiency in the foundation pit. In addition, with the construction of the underground structure, the internal support also needs to be removed layer by layer, which affects the environment and interferes with the construction of the underground structure. [0003] Therefore, it is necessary to improve t...

AI Technical Summary

Problems solved by technology

The internal support system is composed of column piles, columns and horizontal support beams, which increases the cost of the project and reduces the excavation efficiency in the foundation pit

In addition, with the construction of the underground structure, the internal support also needs to be removed layer by layer, which affects the environment and interferes with the construction of the underground structure

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