Full-rotation double-sleeve variable cross-section retaining wall pile forming method for cast-in-place pile

Abstract

The invention relates to the technical field of cast-in-place pile construction in karst development areas, and discloses a full-rotation double-sleeve variable cross-section retaining wall pile forming method for a cast-in-place pile. The full-rotation double-sleeve variable cross-section retaining wall pile forming method for the cast-in-place pile comprises the following steps that S1, a full-rotation drilling machine is in place, so that the full-rotation drilling machine and a pile center coaxially coincide; S2, the full-rotation drilling machine presses down an outer sleeve to drill to the designed elevation according to the design requirement of a pile body; S3, an inner sleeve and the outer sleeve are coaxially arranged, and the full-rotation drilling machine presses down the inner sleeve and drills into a bearing stratum; S4, the full-rotation drilling machine is replaced and connected with a rock drill bit, and the full-rotation drilling machine drives the rock drill bit to drill to the pile bottom elevation; S5, a reinforcement cage is hoisted into a pile hole, and a pouring guiding pipe is placed; S6, concrete is poured through the pouring guiding pipe to form the pile; S7, the concrete is poured, and the inner sleeve is synchronously pulled out; and S8, the concrete is poured, the outer sleeve is synchronously pulled out, and the super-long pile body with the cross-section area gradually decreased is formed. By means of a hole forming method that the full-rotation drilling machine is used for driving the double sleeves, the effect of conveniently forming the hole in the super-long cast-in-place pile is achieved.

Description

technical field [0001] The invention relates to the technical field of cast-in-place pile construction in karst-developed areas, in particular to a pile-forming method for cast-in-place piles with double-sleeve full-rotation variable-section wall protection. Background technique [0002] In recent years, with the rapid development of my country's social infrastructure, at the same time, it is also facing various challenges in the process of infrastructure construction. For example, in the construction of foundation pits, some areas belong to karst karst developed areas, and the distribution of strata is extremely complicated. And multi-layer (beaded) caves. [0003] Various construction problems are prone to occur in the construction of super-long cast-in-place piles in karst karst areas, and the construction is extremely difficult. The construction problems include drilling mud leakage, which causes concrete loss and waste, and greatly increases the comprehensive cost of con...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for forming cast-in-situ piles with full-rotation double-sleeve variable-section wall protection, aiming to solve the problem of inconvenient hole formation for super-long cast-in-place piles in the prior art when constructing super-long cast-in-place piles in karst-developed areas question

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