Method for constructing large-diameter reinforced concrete cast-in-place pile supporting stand column

Abstract

A method for constructing a large-diameter reinforced concrete cast-in-place pile supporting stand column comprises the steps that (1) prefabrication is carried out, wherein a steel reinforcement cage is prefabricated according to the requirement of pile body reinforcing bars; (2) construction is carried out, wherein a formed hole is constructed on the field ground to the elevation of a bearing stratum on the bottom of a designed pile, then, the prefabricated steel reinforcement cage is hoisted in, and pile core concrete is poured; (3) connection is carried out, wherein at the connection position of a cast-in-place pile and an initial layer concrete support, the pile head of the cast-in-place pile is beat away, longitudinal bars of the cast-in-place pile are extended into the supporting steel reinforcement cage with the extending depth 30 times the diameter of the steel bars, supporting concrete are poured, and the cast-in-place pile and the initial layer support are connected together; (4) waterproof operation is carried out, wherein at the connecting position of the cast-in-place pile stand column and a bottom plate of a basement, a protection layer is beat off, an upper expansion water stopping strap and a lower expansion water stopping strap are arranged along the periphery of the cast-in-place pile, the cast-in-place pile stand column is integrally cast in the bottom plate of the basement, and the upper portion cast-in-place pile stand column is removed after the basement structure is completed. The method for constructing the large-diameter reinforced concrete cast-in-place pile supporting stand column solves the problem that a conventional steel latticework stand column is insufficient in bearing force, poor in section bending resistance and torsion resistance capacity and prone to damage by collision of machines to cause instability of a supporting system.

Description

technical field [0001] The invention relates to a cast-in-place pile, in particular to a construction method for a large-diameter reinforced concrete cast-in-situ pile supporting a column. Background technique [0002] The currently known support system columns in foundation pit excavation are steel lattice columns formed by inserting prefabricated steel members into large-diameter reinforced concrete pouring piles (diameter 1000 or 1200mm). bottom elevation, lower the reinforcement cage, pour concrete to the elevation of the bottom of the foundation pit, then lift the prefabricated steel lattice and insert it into the pile core concrete for no less than 2000mm, or weld the prefabricated steel lattice and the reinforcement cage at the lower part of the cast-in-place pile and hoist them into the pile together Then pour concrete to the design elevation of the bottom of the basement floor, and backfill the upper part with sand to facilitate the stripping of the steel lattice af...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a construction method for supporting columns of large-diameter reinforced concrete pouring piles, so as to solve the problems existing in the construction and use of steel columns at present

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