A bentonite injection method and system for blocking water and sand gushing

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 inrush in the technical field of earth pressure balance shield machine. Background technique [0002] At present, when the earth pressure balance shield machine encounters sand and gravel formations, which are rich in water and have strong aquifer permeability, it is difficult to establish earth pressure balance in the excavation bin, and it is easy to cause water and sand gushing when the screw conveyor discharges the soil. The occurrence of the incident caused the road surface to collapse, and even caused personal safety and equipment damage. When the earth pressure balance shield machine encounters water-rich sand and pebble formations, it is easy to cause spewing accidents. A bentonite injection method developed by us to block water and sand gushing can not only lubricate the shield, but also reduce the shield and sand The frictional resistance between them, an...

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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