Tool changing construction method realizing soil mass reinforcement from outside of soil room for earth pressure balance shield machine in sand layer

Abstract

The invention provides a tool changing construction method realizing soil mass reinforcement from outside of a soil room for an earth pressure balance shield machine in a sand layer. The construction method comprises the following steps: step 1, cement slurry is poured to the front of a cutterhead and is poured into the soil room to replace muck; step 2, accelerator slurry is poured into the cement slurry outside the soil room; step 3, the soil room is cleaned, and a tool is changed; step 4, tunneling is recovered. Difficult advanced grouting construction operation and construction operation for removing hardened cement slurry through boring are avoided, damage to equipment due to the hardened cement slurry is eliminated, a grouting construction operation mode is determined clearly, and the construction operation amount is reduced effectively; the tool changing construction method has the advantages of short construction time, high efficiency and high safety.

Description

Technical field [0001] The present invention relates to a construction method in the technical field of tunnel engineering, in particular to a construction method for replacing a knife with an earth pressure balance shield machine in a sand layer to reinforce the soil from the outside of an earth bin. 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...

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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 tool-changing construction method in which the earth pressure balance shield machine in the sand layer reinforces the soil body from the outside of the soil bin, which overcomes the inability of the ground to be reinforced and the sand layer in the prior art. Poor gas holding capacity, easy blockage of grouting port, unclear grouting construction method, equipment damage caused by hardened cement mortar, large workload of chiseling hardened cement mortar, difficulty in advanced grouting reinforcement construction and other shortcomings and deficiencies. Safe tool change construction of earth pressure balance shield machine in sand layer

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