A truss-anchor support structure for foundation pit support

Abstract

The invention discloses a truss and anchor support structure used for foundation pit support. The truss and anchor support structure comprises a side truss structure and is characterized in that the side truss structure is arranged along the circumference of the inner edge of the foundation pit; and the side truss structure comprises vertical column piles, steel vertical columns, enclosing structures and truss cross beams and further comprises anchor cables, the anchoring sections of the anchor cables are obliquely arranged in earth outside the foundation pit downwards, and anchor head pedestals are connected with the anchoring sections by the free sections of the anchor cables of the enclosing structures. Compared with the prior art, the truss and anchor support structure has the advantages that horizontal diagonal braces and vertical columns below the horizontal diagonal braces are omitted, a great plane operation space is provided for the earth digging of the foundation pit and the construction of a basement structure, and the construction efficiency is greatly increased; as the vertical columns and vertical column piles are omitted, the water-proof treatment problem of the vertical columns which penetrate through bottom plates is solved, and the cost is reduced; and the joint action of the anchor cables and the side truss support is adopted, only the anchoring sections are located in the earth, and the size of the anchor cables which extend into the earth outside the foundation pit is greatly reduced, so that the right infringement problem about the anchor cables which extend out of boundary lines is solved.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and relates to a support method combining side truss support and anchor cables in a temporary foundation pit support method. Background technique [0002] For deep and large foundation pits with large plane dimensions and large excavation depths, the foundation pit support methods currently used in China are mainly internal support structures or pile-anchor structures. The plane layout forms of the internal support structure mainly include: grid pattern, opposite truss, angle truss, side truss, ring support, etc. The support components are divided into horizontal support beams and vertical support columns. The columns are set at the junction of beams and beams. The material is steel pipe or steel lattice structure. A pile foundation is set under each column, which mainly bears the vertical load and also bears the support. Part of the horizontal load transferred to the column. T...

AI Technical Summary

Problems solved by technology

[0003] 1. Since there are a large number of columns distributed in the foundation pit, when excavating each layer of earthwork in the foundation pit, it is necessary to avoid the columns when the excavator operates and the earthwork is transported out, which greatly reduces the excavation efficiency. In addition, the superimposed effects of weather and city appearance control make the foundation The excavation progress of the pit earthwork is slow, which prolongs the use time of the foundation pit and the overall construction period, which adversely affects the safety of the foundation pit and the progress of the project

[0004] 2. Due to the large number of supporting components and columns in the foundation pit, the working space is cramped and the work efficiency is reduced during the construction of the proposed basement structure

[0005] 3. Due to the small spacing of the columns and the steel structure, various equipment are likely to cause damage to them during the earthwork excavation process, thus affecting the safety of the foundation pit

[0006] 4. A large number of columns need to pass through the basement floor. Although waterproof steel plates are installed where the columns pass through the floor, it is difficult to guarantee the waterproof effect of the basement because the waterproof layer of the basement floor is pierced by the columns.

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