Treatment and construction method for grooving underground diaphragm wall encountering with underground stirring pile

Abstract

The invention discloses a treatment and construction method for grooving an underground diaphragm wall encountering with an underground stirring pile. The construction method comprises the following steps: (1) judging a beyond-limit range and a hole guiding position of the stirring pile; (2) putting a percussion hammer in position and preparing slurry; (3) guiding a hole by a round drill bit and filling the hole with rock blocks; (4) trimming the hole by a square drill bit and filling the hole with the rock blocks; and (5) grooving a groove section below the depth range of the stirring pile. By means of a method which comprises the steps of backfilling gravels, using the round percussion drill to impact the beyond-limit stirring pile in advance, brushing a wall by the square percussion drill to control the perpendicularity and then grooving by using a grooving machine, the construction method solves the problem that the grooving speed of the grooving machine is slow and the grooving quality is hard to control as the strata in the grooving range are not uniform in hardness as a result of beyond-limit of the stirring pile in a construction process of the underground diaphragm wall, so that the progress of station construction is completed on schedule while the cost is saved, and a good economical benefit is obtained.

Description

technical field [0001] The invention relates to the technical field of underground diaphragm wall trough forming construction technology, in particular to a construction method for treating underground diaphragm wall troughs encountering underground mixing piles, which is suitable for hard obstacles such as stirring piles encountered within the construction range of underground diaphragm walls of foundation pit enclosure structures Grooving construction of the underground diaphragm wall under the condition that the grooving machine cannot be directly troughed due to objects. Background technique [0002] At present, the domestic urban subway construction is in full swing. As a safe construction method, the open-cut method is often the first choice for the foundation pit enclosure structure. In the construction of open-cut method, the underground diaphragm wall is the most common form of enclosure structure for three-storey stations. With the increase of open-cut stations, th...

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Problems solved by technology

[0007] However, the above-mentioned technical scheme still cannot solve the semi-soft and semi-hard geological conditions of the underground diaphragm wall in the trenching range due to the mixing piles encountered during the trenching construction of the underground diaphragm wall. Problems such as the quality of continuous wall groove formation and construction progress are greatly affected

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