Construction method for coping with accumulated slags in large-diameter slurry shield bin

Abstract

The invention discloses a construction method for coping with accumulated slags in a large-diameter slurry shield bin. According to the construction method for coping with the accumulated slags in thelarge-diameter slurry shield bin, based on the difference between the theoretical torque of a cutterhead and the actual torque of the cutterhead and the extrusion force of the cutterhead, the basis of slag accumulation in the bin is judged, the slag flowing mode and the position where the slag accumulation is easily caused in the shield tunneling process are studied, and repeated attempts and test verification are carried out on the slurry circulation mode, a three-inlet three-outlet circulating bin washing method is summarized, namely a slurry pipeline, a rear slurry bin and a front slurry bin. According to the construction method for coping with the accumulated slags in the large-diameter slurry shield bin, the problem that the accumulated slags in the bin is discharged in a stagnant mode in the tunneling process of a shield tunneling machine is solved, the tunneling efficiency of the shield tunneling machine is improved, the risk that the cutterhead forms mud cakes is reduced, thestability of parameters in the tunneling process and the balance of pressure in a slurry bin can be guaranteed, meanwhile, shield cutter abrasion is further reduced, and the construction quality and safety are guaranteed.

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 muddy water shield chamber. Background technique [0002] The mud-water shield machine stabilizes the excavation surface by pressurizing muddy water or mud (usually bentonite suspension). There is a sealed partition behind the cutterhead, and a mud water tank is formed between the excavation surface and the mud. The excavated soil material is mixed with the mud and transported to the separation plant outside the cave by the mud pump, and the mud is reused after separation. [0003] Slurry shield machines often face the problem of slag accumulation in the warehouse in sandy pebble formations, mud cake formations, fault fracture zone formations, joint fissure development formations, soft and hard uneven formations and boulders and other composite formations. This kind of problem is called "slu...

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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