High-pressure-bearing underwater shield entrance and exit hole soil body reinforcing method

Abstract

The invention relates to a high-pressure-bearing underwater shield entrance and exit hole soil body reinforcing method. The method comprises the steps that (1) drilling detection is conducted; (2) preparation before construction is conducted, a site is leveled, the ground is hardened, and the pile placing position is measured according to a reinforcing pile plane graph; (3) a pile machine is put in place; (4) a high-molecular polymer solution is prepared; (5) slurry is prepared; (6) the drilling machine drills downwards; (7) a high-molecular polymer solution is lifted and sprayed; (8) the pile machine drills downwards, and the slurry is lifted and sprayed; (9) stirring up and down is conducted repeatedly, the pile machine is lifted to the top surface, sunk to the bottom, then lifted again, and repeated for 3-5 times; and (10) the pile machine is displaced and a next pile is constructed. According to the construction pretreatment technology, in the cement system soil body reinforcement construction process, the high-molecular polymer solution is sprayed to improve a sandy soil layer, then cement paste, water and bentonite are sprayed for reinforcement, the final cement system soil body reinforcement effect is guaranteed, and safe entering and exiting of a high-pressure-bearing underwater shield are achieved.

Description

technical field [0001] The invention relates to a method for constructing an underground tunnel, in particular to a soil reinforcement method for a shield tunnel with high pressure water. Background technique [0002] The entry and exit hole of the shield machine is the most critical link in the shield construction, and it plays a decisive role in the success or failure of the project. According to statistics, more than 50% of shield tunnel construction accidents are caused by shield tunnel entry and exit, especially in the construction of shield tunnel entry and exit tunnels in strata containing high confined water. When a risk occurs, the main and most common manifestations are water gushing, sand gushing and ground collapse at the entrance of the cave. Regarding the method of controlling the entry and exit holes of the shield tunnel in the confined water formation, the soil reinforcement quality of the shield tunnel entry and exit tunnel is the first line of defense to c...

AI Technical Summary

Problems solved by technology

Among them, the cement-based reinforcement mainly includes three-axis mixing piles, high-pressure rotary grouting piles, MJS, RJP, N-jet, etc. The current cement-based reinforcement technologies mainly have the following shortcomings: The depth of reinforced soil layer is also up to 60m, and the effect of coring of large-scale hole soil reinforcement technology is not ideal, the strength of reinforced soil cannot meet the design requirements, and it is difficult to effectively detect the effect of underground reinforcement

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