High-pressure gas and liquid flushing device and method for treating mud cake of cutter head of shield tunneling machine

Abstract

The device comprises a high-pressure gas and liquid flushing device and method for treating a mud cake of a cutter head of a shield tunneling machine. The device comprises a tubular main body and a connecting ball valve, wherein a water pump joint and an air compressor joint are arranged at the first end of the tubular main body, a spray nozzle is arranged at the second end of the tubular main body, a liquid spray channel and a gas spray channel are arranged on the spray nozzle, a first pipeline and a second pipeline are arranged in the tubular main body, the first pipeline is connected with awater pump joint and the liquid spray channel, and the second pipeline is connected with an air compressed machine joint and the gas spray channel; and a connecting ball valve is connected with a bubble cabin separating cabin plate reserved flushing port interface by a flange, and the tubular main body is arranged in a cavity and the flushing port of the connecting ball valve in a penetrating mode when the cutter head is washed. By the special design flushing device and the flushing medium, the defects that an existing flushing device is short in effective injection length and low in strengthare overcome, the liquid jet energy is reduced by gas while liquid is ejected by the spray nozzle, the jetting length and the flushing strength of liquid jet are increased, and the mud cake of the cutter head is effectively removed.

Description

technical field [0001] The invention relates to the technical field of shield tunneling construction in clay strata, in particular to a high-pressure gas and liquid flushing device and method for treating mud cake on a shield cutter head. Background technique [0002] When the shield machine excavates in the stratum with high clay particle content, part of the soil cut by the cutter is carried out of the shield by muddy water, and part of it adheres to the area with poor fluidity of the cutter head due to its high viscosity. Under the extrusion of the disc and the excavation surface, a mud cake with a certain scale is finally formed on the cutter head panel. The existence of mud cake will reduce the cutting ability of the cutter head, which will lead to abnormal phenomena such as increased thrust of the shield machine, increased torque, and rise in the temperature of the cutter head panel, resulting in adverse consequences such as difficulty in advancing the shield and prolo...

AI Technical Summary

Problems solved by technology

Increasing the circulation flow of muddy water in an attempt to use the fast-flowing muddy water to take away the dregs adhering to the cutterhead has very limited effect. If it is only used as a single method, it will not be able to completely remove the mudcake from the cutterhead; the flushing method of the existing cutterhead flushing device It mainly includes two types of flushing device on the cutterhead panel to flush the cutterhead and flushing the cutterhead from the back of the cutterhead in the above patents. The flushing position is relatively fixed, and the full section of the cutterhead cannot be flexibly covered, and the flushing jet intensity is low. , the destruction effect on the existing mud cake is limited; personnel opening the cabin to remove the mud cake can accurately feed back the mud formation of the cutterhead to the construction personnel, and can also completely remove the existing mud cake, but the personnel opening the cabin needs to be replaced with new slurry, maintenance Pressure test, high-pressure workers stepping in and out of the excavation cabin will inevitably consume a lot of time and financial resources. In addition, the time for high-pressure operation in the excavation cabin is limited, resulting in low efficiency of personnel opening the cabin to remove mud cake.

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