A Construction Method of Circular Drilling for Cut-off Wall Grooving

Abstract

The invention relates to a grooving drilling construction method of a diaphragm wall. The grooving drilling construction method of the diaphragm wall includes the following steps: 1), dividing circulations in a groove section, wherein the deep thick covering layer is divided into a plurality of circulations from top to bottom according to the depth of holes of the groove section; 2), constructing a main hole in a first circulation, wherein the holes are divided into a main hole and an auxiliary hole during groove section construction, the main hole is constructed firstly and then the auxiliary hole is constructed; 3), backfilling clay in the main hole in the first circulation, wherein the main is backfilled with the clay in order to clean the hole and drilling a main hole in next circulation; 4), constructing the auxiliary hole and a wallette in the first circulation; and 5) constructing a main hole, the auxiliary hole and a wallette of the next circulation. When the construction of the main hole, the auxiliary hole and the wallette of the first circulation is finished, construction of next circulation is conducted, and construction is stopped when a final hole is finished. The grooving drilling construction method of the diaphragm wall can reduce the probability of jamming of a drilling tool, tool truck, mud leakage, and collapse accidents during grooving drilling construction of the diaphragm wall, effectively avoids that a wave-shaped wallette appears in the groove or the holes, and guarantees the project quality of the diaphragm wall.

Description

technical field [0001] The invention relates to a groove-forming construction method of an anti-seepage wall, in particular suitable for the groove-forming construction of an anti-seepage wall with a deep and thick covering layer containing a large number of boulders and block stones with loose structure and severe overhead. Background technique [0002] When the cut-off wall trenching construction is carried out in the deep overburden layer containing a large number of boulders and block stones with loose structure and serious overhead, the preferred trenching construction machinery and equipment is the percussion drilling rig. The traditional trenching construction method is "drilling and splitting". The construction process is as follows: (1) Divide the groove section into the main hole and the auxiliary hole, and use the percussion drilling machine to construct the groove under the condition of mud solidification; (2) Construct the main hole first, and drill the main hol...

AI Technical Summary

Problems solved by technology

Because the cut-off wall slots are too deep and the drilling tools of the percussion drilling rig are too heavy, the traditional "drilling and splitting" construction method has the following disadvantages: (1) Drill stuck and buried drill accidents are prone to occur in the slot during the construction of the slot , due to the large difference in depth between the main hole, the auxiliary hole and the small wall hole, the treatment is extremely difficult, and sometimes the treatment fails; (2) Slot holes are prone to slurry leakage accidents. Hole leakage and collapse will not only increase the project cost, but also delay the construction period; (3) The slot is too deep, the small wall is too narrow, it is difficult to construct, and it is easy to form a wavy small wall in the slot section, which directly affects the project quality of the cut-off wall

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