High-pressure gas and liquid flushing device and method for processing shield cutter disc mud cake

Abstract

The invention discloses a high-pressure gas and liquid flushing device and method for processing shield cutter head mud cake. The device includes a tubular main body and a connecting ball valve. The first end of the tubular main body is provided with a water pump joint and an air compressor joint. The second end of the main body is provided with a nozzle, the nozzle is provided with a liquid spray channel and a gas spray channel, and the inside of the tubular main body is provided with a first pipeline connecting the water pump joint and the liquid spray channel and a connecting air compressor joint and the gas spray channel. The second pipeline: the connecting ball valve is flanged to the reserved flushing port interface of the bulkhead of the bubble chamber, and the tubular body is passed through the cavity of the connecting ball valve and the flushing port when flushing the cutter head. The invention uses a specially designed flushing device and flushing medium to make up for the shortcomings of the original flushing device's short effective spray length and low strength. When the nozzle sprays liquid, it is supplemented with gas to slow down the energy attenuation of the liquid jet, increasing the spray length of the liquid jet and flushing. Strength, effectively remove mud cake from cutter head.

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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