Construction method for assembled foundation pit support structure

Abstract

The invention relates to a construction method for an assembled foundation pit support structure. A prefabricated reinforced concrete pile and a prefabricated box type component are mainly adopted. The prefabricated box type component comprises at least one standard piece. Trapezoid tenons 11 and trapezoid mortises 12 are formed in transverse and longitudinal connector positions of the standard pieces in a staggered manner. The prefabricated reinforced concrete pile comprises a front part 41, a rear part 42 and a pile head 43, wherein trapezoid tenons 412 and trapezoid mortises 413 are formed in the two sides of the front part in a staggered manner, and the tenons and the mortises of the prefabricated reinforced concrete pile and the tenons and the mortises of the prefabricated box type component are matched in size. A clamp support 421 used for supporting a prefabricated box type component located at the adjacent position is arranged at the position, close to the front part 41, of the rear part 42. After the whole support structure is spliced, compaction grouting is conducted on the position of a last anti-seepage grouting hole where the corresponding standard piece is arranged, and the anti-seepage grouting holes formed by the standard pieces and a pile body are fully filled with pulp from bottom to top. When it is observed that the pulp overflows out of an anti-seepage grouting hole channel of the top-layer standard piece, grouting is stopped.

Description

technical field [0001] The invention relates to the technical field of foundation pit support, in particular to an assembled foundation pit support structure. Background technique [0002] Foundation pit support is a temporary support, reinforcement, protection and groundwater control measure for the foundation pit to protect the safety of the underground main structure construction and the surrounding environment of the foundation pit. In many construction fields, such as in open-cut subway tunnels, it is necessary to excavate the tunnel first, and then carry out structural construction on the bottom of the foundation pit after temporarily supporting the excavated foundation pit. The retaining structure is removed. In some special construction situations, such as pipeline repairs, the construction period is tight, the tasks are heavy, the construction site is limited, and it is difficult for large-scale construction machinery to operate, and there are environmental interfe...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the problems of high cost, difficult installation, long construction period, poor waterproof, poor anti-seepage, difficult dismantling, and non-recyclable problems existing in the existing foundation pit support technology, and at the same time overcome the problems of To solve the problems of poor stiffness and deformation resistance, provide a construction method that can be assembled at the construction site for the foundation pit support structure

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