Base rock uplift region shielding tool-changing in-situ reinforcement method

Abstract

The invention discloses a base rock uplift region shielding tool-changing in-situ reinforcement method. The base rock uplift region shielding tool-changing in-situ reinforcement method comprises the steps that 1, micro-pile isolation region construction is performed, namely micro-piles are arranged around a cutter disc of a shield machine to form a rectangular isolation region, wherein the micro-piles of the rectangular isolation region are located in front and at back of the cutter disc of the shield machine and on the left side and the right side of the cutter disc of the shield machine respectively, the micro-piles located in front are 2 to 3 meters away from the cutter disc of the shield machine, the micro-piles located at the back are 3 to 4 meters away from the cutter disc of the shield machine, and the micro-piles located on the left side and the right side are 1.5 to 2 meters away from the cutter disc of the shield machine; 2, sleeve valve pipe grouting is conducted in the micro-pile isolation region. A curtain is formed around the cutter disc of the shield machine by adopting the micro-piles, the formed curtain is the rectangular isolation region formed by the micro-piles arranged around the cutter disc of the shield machine, and soil reinforcement is performed in the rectangular isolation region in the sleeve valve pipe grouting mode to effectively prevent the slurry leakage risk occurring in the grouting process, ensure effectiveness of grouting operation, avoid the influence on construction progress and reduce safety risk.

Description

technical field [0001] The invention relates to an in-situ soil reinforcement method in the process of shield tunneling in sea reclamation areas, in particular to an in-situ reinforcement method for shield tunneling tool change in bedrock uplift areas. Background technique [0002] In the shield construction of composite strata in reclamation areas, soil reinforcement is an important link in the construction, and it is also the focus of safety construction control. Especially in the process of shield excavation, the shield machine passes through the uplift section of the bedrock above the soft and hard strata, and the soft stratum must be reinforced, and the tool wear can pass through the uplift area of ​​the bedrock, so the shield machine's overall cutter is rolling A knife and a heavy duty hob are necessary. [0003] The shield machine is used to directly break the rock and pass through the uplift section of the bedrock, which has a relatively large wear and tear on the t...

AI Technical Summary

Problems solved by technology

[0004] In the bedrock uplift section of the shield excavation section, the lower part of the shield machine is high-strength bedrock, and the upper part is sand layer. It is not feasible to open the warehouse under normal pressure. After the test, the gas compression operation cannot be implemented due to too much leakage.

Images