A method of rotary spraying reinforcement for ultra-deep silt formation

Abstract

The invention discloses a rotary spray reinforcement method of a super-deep silt stratum. The rotary spray reinforcement method comprises the following steps: (a) pile hole positioning; (b) componentassembling; (c) drilling rig in-place drilling; (d) pipe inserting; and (e) construction of a next pile hole. Construction is convenient, quick, reasonable and orderly, the application range is wide,the occupied area is small, vibration is less, noise is low, flexible adjustment can be achieved in the construction process, the construction quality is convenient to control, the construction cost is convenient to lower, the silt stratum is effectively reinforced, and the bearing capacity of the silt stratum is improved.

Description

technical field [0001] The invention belongs to the technical field of subway engineering, and in particular relates to a rotary spraying reinforcement method for an ultra-deep mud formation. Background technique [0002] Due to the characteristics of high water content, high compressibility, low permeability, and long consolidation time in silt formations, the construction of subway foundations on silt formations is likely to cause problems such as settlement and insufficient bearing capacity. In order to ensure safe and stable excavation of shield tunneling , the silt formation must be reinforced. [0003] Generally, cast-in-situ piles are built in silt strata to achieve the purpose of reinforcement, but there are problems such as high cost, cumbersome and complicated construction of cast-in-place piles, and although the pile body is a reinforced concrete structure, the outside of the pile body is still silt, which is not conducive to bearing side In addition, cast-in-sit...

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Problems solved by technology

[0003] Generally, cast-in-situ piles are built in silt strata to achieve the purpose of reinforcement, but there are problems such as high cost, cumbersome and complicated construction of cast-in-situ piles, and even though the pile body is a reinforced concrete structure, the outside of the pile body is still silt, which is not conducive to bearing side In addition, cast-in-situ piles generally have to enter the bearing layer during construction, and the pile body must be lengthened, resulting in increased costs

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