Muddy water circulation and stone crushing method for shield tunneling machine

Abstract

The invention provides a muddy water circulation and stone crushing method for a shield tunneling machine. The method comprises the following steps: mixing ballast soil and stone blocks after being cut by a cutter disc with mud injected from the outside of a tunnel to form a fluid which enters an air cushion cabin, conveying the fluid in the air cushion cabin to a mud pipeline crushing machine outside the air cushion cabin under the action of a mud discharging pump, crushing the stone blocks from the air cushion cabin in the mud pipeline crushing machine, and discharging the crushed stone blocks along with the mud outside the tunnel from a mud discharging pipe. The mud pipeline crushing machine comprises a sealing gasket, a rack and a moving jaw assembly and is a closed jaw crushing machine capable of internally sealing the mud fluid with the pressure being up to 0.5MPa or more. The invention provides the muddy water circulation and stone crushing method for the shield tunneling machine, which can be used for improving the stone crushing capacity of a muddy water circulation system of the shield tunneling machine, improving the performance of the muddy water circulation system, and improving the ballast-carrying conveying capacity of the muddy water circulation system. The method provided by the invention is used for improving the geology adaptability and the tunneling efficiency of the shield tunneling machine.

Description

technical field [0001] The invention belongs to the technical field of underground excavation, and in particular relates to a muddy water circulation and stone crushing method of a shield machine. Background technique [0002] From the front end of the excavation position to the rear end of the shield machine, it consists of an excavation cabin containing a cutter head, an air cushion cabin and a trailer. The main purpose of the air cushion cabin is to balance and stabilize the excavation surface. At present, in the process of tunnel excavation by the shield machine in the water-rich sand and pebble stratum using the mud-water balance method, it is necessary to remove the muck through the mud-water circulation system and maintain the stability of the excavation surface; at this time, the shield machine dregs method is: The muck and pebbles after disc cutting and the mud injected from outside the tunnel are mixed in the excavation cabin to form a fluid that enters the air cus...

AI Technical Summary

Problems solved by technology

When the shield machine is constructing tunnels in the water-rich strata with high content, high hardness, and large particle size pebbles in southwest, northwest, and north China, the crushing speed of the hydraulic jaw crusher in the air cushion cabin is only four per minute. times, and often damaged under harsh working conditions, it is impossible to quickly crush the pebbles with large flow and large particle size in the air cushion cabin to the conveying range of the slurry pump, and it is very easy for the shield machine to have pebbles in the air cushion cabin and muddy water Faults such as the blockage of the slurry outlet pipeline of the circulation system and the damage of the slurry discharge pump caused the shield machine to be shut down for maintenance for a long time, which greatly limited its excavation ability.

[0003] Therefore, this field needs to develop a kind of muddy water circulation and stone crushing method of new shield machine to overcome the problem that the crushing capacity of the hydraulic jaw crusher in the above-mentioned air cushion cabin is too low

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