Construction process and equipment for downhole impacting high-pressure jet grouting pile

Abstract

The invention relates to a construction process and equipment for a downhole impacting high-pressure jet grouting pile. An impactor is used for generating certain vibration impact effect in an impacting and sinking process, the impactor is driven by high-pressure air, and damage effect is produced to a soil body structure by virtue of vibration and high-pressure air; meanwhile, auxiliary soil body cutting effect of a high-pressure water jet is utilized at the upper part of the impactor; cutting damage to soil body by high-pressure water, gas and vibration is used for providing conditions for subsequent concrete spraying, under high frequency vibration of a downhole impactor, high-pressure water, high-pressure gas and high frequency vibration generate a linkage mechanism to rapidly soften the soil body at the periphery, the soil body is in a plastic flow state, after a high-pressure pump is transformed to spray high-pressure concrete, the soil in the plastic flow state is fully mixed with concrete, and a cement-soil pile with larger diameter and uniform concrete is formed. In the invention, under the high frequency vibration of the downhole impactor, the high pressure water, the high pressure gas and the high frequency vibration generate the linkage mechanism, diameter of a finished pile is larger, and strength of a pile body is higher.

Description

technical field [0001] The invention belongs to the pile-forming technology in building foundation construction, in particular to the construction technology of submerged-hole impact high-pressure rotary grouting piles. It is used for the construction of water-stop curtain piles, foundation piles, foundation pit enclosure piles, etc. It is suitable for general strata such as plain fill, miscellaneous fill, cohesive soil, sandy soil, etc., and is especially suitable for sand, pebble and gravel layers that are difficult to drill into. Boulders, hydraulic reclamation, riprap, concrete old foundation, bedrock and other complex strata. technical background [0002] High-pressure rotary grouting piles are used for foundation reinforcement of soil such as silt, silt, sand, plain fill, etc., and can also be used for soil reinforcement and curtain water sealing of deep foundation pits, subway projects, water conservancy projects, etc. However, due to the low power of the rotary grou...

AI Technical Summary

Problems solved by technology

[0011] 2. Poor drilling feasibility: During the construction of the slope protection pile, when passing through the sand layer and gravel layer, it is very easy to have collapsed holes and quicksand under the influence of external forces such as mechanical agitation or groundwater gushing, etc., when pouring underwater concrete. Diameter expansion (commonly known as "big belly") is formed here. Once the drill bit encounters the phenomenon of diameter expansion, the pile position will deviate or cannot be drilled. If the pile is not repaired outside the pile, the water-stop effect will not be achieved.

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