A construction method of filling and changing tools for reinforcement in the shield machine chamber

Abstract

The invention provides a construction method for filling and changing tools for reinforcement in the shield machine chamber. The steps of the method include: the first step, injecting bentonite slurry into the earth chamber; the second step, replacing the muck in the earth chamber with air mud; the third step is to fill the gap under pressure; the fourth step is to connect the sleeve valve; the fifth step is to backfill the soil silo with cement mortar; the sixth step is to inject accelerator into the cement mortar in front of the soil silo, The cement mortar at the back of the warehouse is injected with retarder; the seventh step is to clear the warehouse and change the tool; the eighth step is to resume the excavation. The invention avoids difficult advanced grouting construction operations, prevents equipment damage caused by cement mortar hardening in the screw conveyor, clarifies the grouting construction operation mode, reduces the difficulty of removing hardened bodies in the soil bin, and effectively reduces warehouse clearance Amount of work; the invention has short construction time, high efficiency and strong safety.

Description

technical field [0001] The invention relates to a construction method in the technical field of tunnel engineering, in particular to a construction method for filling and changing tools for reinforcement in a shield machine chamber. Background technique [0002] At present, the construction of subway tunnels at home and abroad is developing rapidly, and these subway tunnels need to be constructed by the shield method. Shield tunneling has developed rapidly in many cities due to its advantages of safety, high efficiency and high degree of mechanization. The earth pressure balance shield method is a fully mechanical construction method commonly used in shield tunneling construction. It uses an earth pressure balance shield machine to cut the soil through the cutter head in front of the shield machine and pass the muck through the screw conveyor. After being transported out of the tunnel, the shield machine is pushed forward under the support of the casing and segments. Durin...

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Problems solved by technology

[0004] Aiming at the defects in the prior art, the object of the present invention is to provide a construction method for filling and changing tools for reinforcement in the shield machine chamber, which overcomes the inability of the ground to be reinforced, the poor gas retention capacity of the sand layer, and the injection The grout mouth is easy to block, the grouting construction method is not clear, it is difficult and time-consuming to break the hardened cement mortar in the process of clearing the warehouse, and the advanced grouting reinforcement construction is difficult and the workload is heavy. Safe tool change construction of earth pressure balance shield machine

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