A shield machine tool change construction method for soil bin mortar mixed with bentonite mud film in sand layer

Abstract

The invention provides a shield machine tool change construction method for soil bin mortar mixed with bentonite mud film in the sand layer. The steps of the construction method include: the first step, alternately injecting water glass slurry and calcium chloride into the front of the cutter head slurry; the second step is to inject bentonite slurry to the front of the cutterhead; the third step is to output the muck in the soil bin; the fourth step is to prepare mud film; the fifth step is to inject cement mortar and bentonite mud into the soil bin Mix the slurry; the sixth step is to clear the warehouse and change the tool; the seventh step is to resume the excavation. The invention effectively reduces the strength of the hardened body in the soil bin during the warehouse clearing process, reduces the difficulty of breaking the reinforced body, avoids the difficult advance grouting construction operation, and prevents the cement mortar in the screw conveyor from being hardened to cause equipment damage. The grouting construction operation method 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 shield machine tool change construction method of a soil bin mortar mixed with bentonite mud film in a sand layer. Background technique [0002] With the improvement of my country's urbanization level, a large number of intercity railways, high-speed railways, and urban rail transit construction need to be carried out, including many tunnel projects. A large number of tunnels need to be constructed by the shield method. The earth pressure balance shield method is a fully mechanical construction method commonly used in shield construction. It uses an earth pressure balance shield machine, which cuts the soil through the cutter head in front of the shield machine, and passes the ballast through the screw conveyor When transported out of the tunnel, the shield machine advances under the support of the shell and segment. In the process of shield adv...

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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 shield machine tool change construction method of soil bin mortar mixed with bentonite mud film in the sand layer, which overcomes the inability of the ground to be reinforced and the sand layer to be protected in the prior art. Poor air capacity, easy blockage of grouting port, unclear grouting construction operation method, difficult and time-consuming removal of hardened cement mortar during warehouse clearance, difficult and heavy workload of advanced grouting reinforcement construction and other shortcomings and deficiencies. Safe tool change construction of earth pressure balance shield machine without ground reinforcement

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