Bentonite injection method and system for blocking gushing water and sand

Abstract

Provided is a bentonite injection method and system for blocking gushing water and sand and applied to the technical field of earth pressure balance shield machines. The bentonite slurry is pumped from a first bentonite tank on a rear supporting vehicle to injection points around a shield body of a shield machine through a first quantitative centrifugal pump, the injection points of the shield body are circumferentially and uniformly arranged to provide sufficient and effective propulsion for the tunneling of the shield machine, the bentonite slurry liquid is switched to a foam system by being switched to the same injection opening of a rotary connector and a foam injection system through a control valve to for achieving the independent injection of the bentonite to the outside of a tool plate and completing muck improvement, and the bentonite slurry in an excavation chamber is pumped to a muck vehicle through a second quantitative centrifugal pump. The bentonite injection method and system for blocking gushing water and sand effectively solves the problem that a pressure balance is difficult to establish in the excavation chamber when the shield machine works on a sandy gravel stratum containing abundant moisture so as to effectively avoid road collapse, endangering the personal safety and damaging equipment.

Description

technical field [0001] The invention relates to a bentonite injection method and system for blocking water and sand gushing in the technical field of earth pressure balance shield machines. Background technique [0002] At present, when the earth pressure balance shield machine encounters sand and pebble strata, which is rich in water and has strong permeability, it is difficult to establish earth pressure balance in the excavation chamber, and it is easy to cause water and sand gushing when the screw conveyor discharges soil. The occurrence of the accident will cause the road surface to subside, and even cause damage to personal safety and equipment. When the earth pressure balance shield machine encounters a stratum rich in water and sand and pebbles, it is easy to cause gushing accidents. A bentonite injection method developed by us to block water and sand gushing can not only lubricate the shield body, but also reduce the shield body and sandy soil. The friction resista...

AI Technical Summary

Problems solved by technology

[0002] At present, when the earth pressure balance shield machine encounters sand and pebble strata, which is rich in water and has strong permeability, it is difficult to establish earth pressure balance in the excavation chamber, and it is easy to cause water and sand gushing when the screw conveyor discharges soil. The occurrence of accidents will cause road surface subsidence, and even cause damage to personal safety and equipment.

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