Underground diaphragm wall construction method suitable for pebble and boulder stratums with non-uniform hardness

Abstract

The invention discloses an underground diaphragm wall construction method suitable for pebble and boulder stratums with non-uniform hardness. The method includes the four steps of grooving of the softpebble and boulder stratum, drilling of vertical drill holes, soil grasping grooving of the hard pebble and boulder stratum and underground diaphragm wall construction. After the soft pebble and boulder stratum is excavated, grooving work is carried out directly through a grooving machine, the multiple stretching vertical drill holes are drilled in a grooving position, and the vertical drill holes stretch along the whole depth of an underground diaphragm wall foundation trench in the hard pebble and boulder stratum. The vertical drill holes are formed in the position of a grab bucket of the grooving machine, the grab bucket can more easily enter the hard pebble and boulder stratum along the vertical drill holes, the grooving speed of an underground diaphragm wall is increased, abrasion ofthe grooving machine is reduced, and the construction cost of the underground diaphragm wall in the specific stratums is reduced; and meanwhile, the grooving machine can be guided to carry out the grooving work through the vertical drill holes, and clearance intrusion of the underground diaphragm wall is reduced.

Description

technical field [0001] The invention relates to the field of underground diaphragm wall construction, more specifically, it relates to an underground diaphragm wall construction method suitable for soft and hard uneven pebble boulder formations. Background technique [0002] When excavating the foundation pits of urban rail transit subway stations and building houses, they generally belong to the "soft top and hard bottom" stratum. Due to the high strength of the hard rock in the stratum, it is difficult to form a groove in the underground diaphragm wall. It is difficult for the hydraulic grab of the traditional groove forming machine to directly For grooving, an impact drill is required to cooperate with a grooving machine for grooving. This construction method is often inefficient, and the problem of delaying the construction period has not been solved. While increasing the construction cost, the problem of the invasion of the underground diaphragm wall is also very seriou...

AI Technical Summary

Problems solved by technology

This kind of construction method is often not efficient, and the problem of delaying the construction period has not been solved. While increasing the construction cost, the problem of the invasion of the underground diaphragm wall is also very serious.

[0003] With the development of the times, the number of foundation pit projects is increasing. The traditional underground diaphragm wall trenching method often fails to meet the construction period requirements when dealing with soft and hard uneven pebbles and boulders, and the accuracy cannot be guaranteed.

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