Tool changing construction method for in-chamber grouting of earth pressure balance shield machine in sand bed

Abstract

The invention provides a tool changing construction method for in-chamber grouting of an earth pressure balance shield machine in sand bed. The tool changing construction method comprises the following steps: step 1, injecting bentonite slurry into a soil chamber; step 2, replacing air with muck slurry in the soil chamber; step 3, performing pressurized gap filling; step 4, backfilling the soil chamber; step 5, cleaning the chamber and exchanging tools; step 6, recovering tunneling. The tool changing construction method is used for chamber filling tool exchanging of the earth pressure balance shield machine in sand bed without ground reinforcing conditions, avoids difficult advanced grouting construction operation, makes clear the grouting construction operation mode, prevents cement mortar in a screw conveyor from being hardened to cause equipment damages, effectively reduces the construction operation workload, and is short in construction time and high in efficiency and 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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