Automatic escape method for double-shield TBM (tunnel boring machine) shield jamming

Abstract

The invention discloses a double-shield TBM (tunnel boring machine) shield jamming automatic escape method which comprises the following steps: reserving a plurality of grouting holes in the upper semicircle of a shield, pouring thixotropic slurry into the grouting holes by a grouting pump through a grouting pipeline, and reducing the friction coefficient between a shield shell and surrounding rock, thereby reducing the propelling friction resistance and realizing automatic escape by a TBM propelling system. In order to prevent the thixotropic slurry from flowing back to the outer side of the duct piece, cement mortar is poured through a duct piece grouting hole behind the tail shield, and a closed slurry stop ring is formed. According to the method, the drag reduction effect of thixotropic slurry is utilized, investment is small, efficiency is high, construction is convenient and fast, the TBM is made to escape autonomously through the method, operation is safe, escape can be completed within a very short time, and cost and time are saved.

Description

technical field [0001] The invention relates to a method for autonomously escaping a shield stuck machine in a double-shield TBM tunnel construction. Background technique [0002] When TBM passes through unfavorable rock formations, due to complex geological conditions and unstable surrounding rocks, the TBM is easily stuck due to excessive deformation or large-scale landslides. Due to the long shield of the double-shield TBM, it takes time and effort to deal with the stuck machine. If the treatment method is not proper and the trouble is not solved in time, the TBM fuselage will be deformed and damaged under long-term stress, which will cause major economic losses and affect the construction progress of the project. Therefore, it is very necessary to use a convenient and quick method of self-extrication. [0003] At present, the main ways to get out of a jammed machine are: (1) Excavation of a pilot tunnel, the main principle of which is to release the self-weight stress a...

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Problems solved by technology

[0003] At present, the main ways to get out of the stuck machine are: (1) Pilot tunnel excavation, its main function principle is to release the self-weight stress and horizontal expansion stress of the surrounding rock, and at the same time use the pipe shed construction space to release the shield to make the TBM get out of trouble. The implementation of the method is troublesome, the processing period is long, and the investment is relatively large

(2) Chemical grouting. This method is mainly to consolidate the loose surrounding rock that has collapsed outside the shield to ensure the stability of the surrounding rock around the main engine, and then to expand and excavate the difficulties. It also has the problems of long construction period and high investment.

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