Method for preventing spiral conveyor of earth pressure balance shield tunneling machine from gushing

Abstract

The invention discloses a method for preventing a spiral conveyor of an earth pressure balance shield tunneling machine from gushing. The method comprises the following measures that firstly, a first gate, a second gate, a muck discharging guide pipe, a third gate and a muck sliding hopper are sequentially installed at a muck outlet of the spiral conveyor, when the shield tunneling machine conducts tunneling in the sandy soil stratum, the opening degree of the first gate is controlled to be 10%-20%, the opening degree of the second gate is controlled to be 30%-40%, and the opening degree of the third gate is controlled to be 50%-60%; secondly, when the spiral conveyor still gushes after the first measure is taken, bentonite slurry is injected into a soil bin for muck improvement; and thirdly, when the spiral conveyor still gushes after the first measure and the second measure are taken, a high-molecular polymer aqueous solution is slowly injected into the soil bin to thicken muck. According to the method, continuous muck discharging is facilitated, the probability of gushing of the spiral conveyor is reduced, and fluctuation of the pressure of the soil bin can be reduced.

Description

technical field [0001] The invention relates to a method for preventing spewing of a screw conveyor of an earth pressure balance shield machine. Background technique [0002] The hydraulic motor of the shield machine drives the cutter head to rotate, and the muck cut off from the excavation face enters from the opening of the cutter head and falls to the bottom of the soil bin, and is transported to the slag discharge gate by the screw conveyor, and then discharged to the belt conveyor On the machine, the belt conveyor unloads the slag into the slag bucket truck parked on the track, and transports it to the slag outlet outside the cave, lifts it to the ground and pours it into the slag pit. [0003] During the construction of the earth pressure balance shield machine, if it encounters bedrock protrusions and weathered rock strata in the whole section, the crack water in the transition section between soft and hard uneven rock and soil is relatively developed, which will caus...

AI Technical Summary

Problems solved by technology

The gate of the soil bin is divided by two gates on the left and right, and the opening is opened from the middle to both sides. The advantage is that the space occupied is small, but the muck is easy to deposit at the gate if the flow is not smooth, and it will be stuffed into the gap and easily jam the gate of the soil bin. switch

When the slag gate of the screw conveyor encounters gushing, the gushing silt acts on the gate plate of the slag gate, which increases the resistance of the slag gate and cannot be closed normally, which may easily cause excessive gushing and even ground collapse

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