Construction method for dealing with slag accumulation in large-diameter slurry shield silo

Abstract

The invention discloses a construction method for dealing with slag accumulation in a large-diameter muddy water shield silo. The invention is based on the difference between the theoretical torque of the cutter head and the actual torque of the cutter head, and the basis for judging the accumulation of slag in the bin based on the size of the extrusion force of the cutter head. Through the research on the parts, and repeated attempts and experimental verification of the mud-water circulation method, the "three-in-three-out" cycle washing method was concluded: mud pipeline ↔ back mud water silo ↔ front mud water silo. The invention solves the problem of slag accumulation and stagnation in the silo during the tunneling process of the shield machine, improves the tunneling efficiency of the shield machine, reduces the risk of mud cake on the cutter head, and can ensure the stability of parameters during the tunneling process and the storage of muddy water in the silo. The balance of pressure, while further reducing the wear of shield tools, ensures the construction quality and safety.

Description

technical field [0001] The invention relates to the technical field of shield construction, in particular to a construction method for dealing with slag accumulation in a large-diameter mud-water shield silo. Background technique [0002] The mud-water type shield machine stabilizes the excavation surface by pressurizing mud water or mud (usually bentonite suspension). There is a sealing baffle behind the cutter head, and a mud-water silo is formed between it and the excavation surface, which is filled with mud. The excavated soil and the mud are mixed by the mud pump and transported to the separation plant outside the cave, and the mud is reused after separation. [0003] The mud-water shield machine often faces the problem of slag accumulation in the silo in complex formations such as sandy and pebble formations, formations prone to mud cake formation, formations with fault fracture zones, formations with developed joints and fissures, uneven soft and hard formations and b...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a construction method for coping with the slag accumulation in the large-diameter muddy-water shield tunnel, which can timely and effectively deal with the problem of reduced excavation efficiency caused by the slag accumulation in the silo, and further avoid the cutterhead sludge caused by the slag accumulation in the silo Cake, tool temperature increases and tool wear and other consequences are aggravated

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