Ultradeep underground continuous trenching construction method

Abstract

The invention discloses an ultradeep underground continuous trenching construction method. The ultradeep underground continuous trenching construction method is characterized in that during a trenching process, when the depth of a trench is smaller than 10 meters, the distance between a guide wall and a steel wire rope for hoisting a hydraulic grab is measured by utilizing a go-no-go gauge; if thedistance between the steel wire rope and the two sections of guide walls meets the measuring requirement of the go-no-go gauge, the perpendicularity meets requirements, and excavation is continued; and after the depth of the trench is larger than 10 meters, measurement is performed by adopting an ultrasonic gauge after a certain depth is excavated; and if the perpendicularity of a side wall meetsrequirements, excavation is continued. By adopting the ultradeep underground continuous trenching construction method, the final trenching perpendicularity of an underground continuous wall with a construction depth exceeding 60 meters can be controlled within 1 / 1000; an ultralong steel rib cage of which two ends are provided with I-steel connectors can be launched to a designed depth; and the construction time of ultradeep underground continuous walls is shortened.

Description

Technical field [0001] The invention relates to a construction method for forming a groove in an ultra-deep underground continuous wall. Background technique [0002] When the underground continuous wall is constructed, the trench is first excavated. When digging a trench, first build two sections of guide walls extending from the ground to the ground. The depth of the guide walls is generally 1-1.5 meters. A hydraulic grab is used to excavate a groove between the two sections of guide walls, and the width of the groove is the same as the distance between the two sections of guide walls. [0003] The excavation into the groove is usually done with a hydraulic grab. The hydraulic grab is hung by a wire rope and continuously digs into a slot. Although the hydraulic grab is heavier, it can stay upright by using its own weight when hanging naturally. However, during excavation, since it enters the soil layer, it will be affected by the resistance and collision of the soil layer dur...

AI Technical Summary

Problems solved by technology

In actual construction, these regulations are applicable to the underground diaphragm wall whose groove depth is not greater than 40m, but once the groove depth exceeds 40m, especially when the joints adopt rigid joints, it is difficult for the reinforcement cage to be lowered into place smoothly

However, for ultra-deep underground diaphragm walls with groove depth greater than 60m, construction cannot be carried out if the verticality of the groove is still controlled according to the existing regulations

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