One-time forming construction method for inserting steel pipe column into cast-in-situ bored pile in pilot tunnel

Abstract

The invention discloses a one-time forming construction method for inserting a steel pipe column into a cast-in-situ bored pile in a pilot tunnel. The method comprises the following steps: 1, carrying out guiding hole construction in a pilot tunnel used for pile operation; 2, carrying out drilling machine positioning and drilling; 3, installing a pile foundation reinforcement cage a steel pipe column and an in-column reinforcement cage in the drilled hole; 4, carrying out accurate positioning and levelling on the steel pipe column by utilizing a hydraulic steel pipe column inserting machine; 5, pouring pile foundation concrete and steel pipe column concrete; 6, backfilling rubbles between the steel pipe column and columns; 7, continuing to pour steel pipe column concrete; 8, backfilling coarse sand, moving away the hydraulic steel pipe column insertion machine, pumping out mud and changing a tool pipe into a first section of steel pipe column; and 9, arranging the in-column reinforcement cage of the first section of steel pipe column, pouring steel pipe column concrete, and carrying out concrete curing, thus finishing pile construction. The construction method disclosed by the invention combines two procedures, including drilling pouring pile construction at the lower part and steel pipe column installation at the upper part, and can achieve one-time forming.

Description

technical field [0001] The invention belongs to the technical field of underground excavation construction, in particular to a one-step forming construction method for inserting steel pipe columns into bored cast-in-place piles in pilot holes. Background technique [0002] With the continuous progress of subway construction technology and the continuous innovation of the underground engineering field, many new construction methods have been proposed, among which the shallow buried hole-digging pile method is a very representative one. This method absorbs the characteristics of cover and excavation method on the basis of the traditional shallow burial and underground excavation method, and is flexible and widely applicable. The shallow buried hole excavation pile method has been successfully applied in several station projects of Beijing Metro Line 10, which fully proves that it is feasible to excavate shallow buried large-section caverns in loose and weak strata, and this me...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a one-time forming construction method for inserting a steel pipe column into a bored pile in a pilot tunnel, so as to solve the problem of difficulty and high risk in the construction of the steel pipe column installation locator, and at the same time solve the problem of large error and low construction efficiency of the manual installation of the locator , The problem of high safety risks for workers in underground operations

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