Anchoring support utilizing shallow foundation pit in pit with large height difference and foundation pit construction method

Abstract

The invention discloses an anchoring support utilizing a shallow foundation pit in a large-height-difference pit and a foundation pit construction method. The anchoring support comprises a retaining assembly, a force transmission assembly and an anchoring support assembly. The supporting and retaining assembly comprises a plurality of steel sheet piles, namely steel enclosing purlins arranged at the upper ends of the steel sheet piles. The force transmission assembly comprises anchoring steel bars corresponding to all the steel sheet piles. One end of each anchoring steel bar penetrates through the corresponding steel sheet pile and the corresponding steel enclosing purlin and is restrained on the inner side of the steel enclosing purlin, and the other end of each anchoring steel bar is anchored on a reinforced concrete bottom plate of the shallow foundation pit; tensile steel bars are symmetrically and uniformly distributed on the two sides of each anchoring steel bar at the construction seam edge of the reinforced concrete bottom plate; the anchoring support assembly comprises a plurality of shallow foundation pit engineering piles. During construction, firstly, the shallow foundation pit is excavated, an anchoring support is constructed at the bottom of the shallow foundation pit, then, the deep foundation pit is excavated, a basement reinforced concrete structure is constructed, and after completion, a fertile groove is backfilled, and the anchoring support is recycled. On the premise that the construction quality of the piled raft foundation basement structure is guaranteed, the horizontal bearing capacity of the engineering piles is more effectively utilized.

Description

technical field [0001] The invention relates to the technical field, in particular to an anchor-pull support and a foundation pit construction method using a shallow foundation pit in a pit with a large height difference. Background technique [0002] With the development of the construction industry, the development forms of underground space have become more and more diverse, and it has become particularly common for large-scale pits with large height differences to appear inside large foundation pits. [0003] In practical applications, for the foundation pit project where the foundation form of the basement adopts the pile-raft foundation and the open-cut method is used for construction, when there is a pit with a large height difference in the local area, the usual construction method is to use grading or excavation. Bored piles cantilever support. [0004] However, the grading and excavation method will disturb the foundation soil in the range of the pit roof at the r...

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Problems solved by technology

[0008] However, in the prior art, due to the small bending stiffness of the steel sheet pile, the form of the cantilevered steel sheet pile cannot meet the safety and stability of the pit in the pit with a large height difference, and it is necessary to add a support or anchor structure at the top of the pile to achieve

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