Anti-settling mud and grouting slurry for shield construction

Abstract

The invention discloses an anti-settling mud for shield construction and a grouting slurry for shield construction. The anti-settling mud for shield construction comprises calcium-based bentonite, sodium-based bentonite, lime, cement, and cellulose derivatives. objects, polymers. The grouting slurry for shield construction includes A liquid and B liquid, the A liquid includes anti-settling mud and water for shield construction, and the B liquid is water glass. The invention is non-toxic and environment-friendly, can be used for filling the gaps in the upper periphery of the shield machine, and can also be used for building a protective mud film before the shield is opened with pressure to change the tool, and has good anti-sedimentation effect and high mud film strength.

Description

technical field [0001] The invention relates to the field of shield construction materials, in particular to an anti-settling mud and grouting slurry for shield construction. Background technique [0002] With the continuous development of the city, the upsurge of urban subway construction is on the rise. However, at present, shield tunnels are constructed to pass through soft strata, strata with poor soil self-stability, and pass through buildings under complex geological conditions. For the safety of structures and construction workers, reinforcement and improvement methods are usually carried out for geologically complex and unfavorable areas and areas passing through structures, such as: using high-pressure grouting methods such as MJS, CCP, JSG, and CJG on the ground, or advancing into the cave Inject cement slurry and other measures. [0003] At present, commercially available mud materials are often used to fill the gaps in the upper periphery of the shield machine t...

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Problems solved by technology

[0003] At present, commercially available mud materials are often used to fill the gaps in the upper periphery of the shield machine to achieve the effect of supporting and preventing settlement. However, these mud materials are not only expensive but also too weak and non-solidifying. They can only become thick mud and cannot Rapidly develops sufficient strength, insufficient protection for particularly weak formations

[0004] In addition, materials such as bentonite mud used to build mud films currently used in shield tunneling under pressure to open and change tools can form mud films, but the strength of the established mud films is not high, which is safe for workers who change tools under pressure. low protection

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