A construction method for grouting and tool change in the chamber of earth pressure balance shield tunneling machine in sand layer

Abstract

The invention provides a construction method for grouting and tool change in the earth pressure balance shield machine chamber in the sand layer. The steps of the method include: the first step, injecting bentonite mud into the soil chamber; the second step, replacing the soil with air The muck slurry in the bin; the third step, filling the void under pressure; the fourth step, backfilling the soil bin; the fifth step, clearing the bin and changing the tool; the sixth step, resuming the excavation. The present invention aims at the problem of earth pressure balance shield machine filling and changing tools under the condition of no ground reinforcement in the sand layer, avoids the difficult advanced grouting construction operation, clarifies the grouting construction operation mode, and prevents the cement mortar in the screw conveyor Hardening causes equipment damage, which effectively reduces the construction workload; 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 grouting and tool change in an earth pressure balance shield machine chamber in a sand layer. Background technique [0002] In recent years, with the continuous advancement of China's urbanization process, the problem of urban traffic congestion has become more and more serious. The construction of subway tunnels can solve or improve the current situation of urban traffic, so it has been widely used. These subway tunnels need to be constructed using the shield method. 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 mach...

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Problems solved by technology

[0004] Aiming at the defects in the prior art, the purpose of the present invention is to provide a construction method for grouting and tool change in the earth pressure balance shield machine cabin in the sand layer, which overcomes the inability of the ground to be reinforced and the gas retention capacity of the sand layer in the prior art. Poor, easy to block the grouting port, unclear grouting construction operation method, difficult construction of advance grouting reinforcement and heavy workload and other shortcomings and shortcomings, to realize the safe tool change of the earth pressure balance shield machine under the condition of no ground reinforcement in the sand layer construction

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