High-pressure jet grouting pile foundation reinforcement construction method

Abstract

The invention relates to a high-pressure jet grouting pile foundation reinforcement construction method which comprises the following steps that firstly, a plurality of grout stopping curtain piles are arranged along the boundary of a foundation reinforcement area in a driving mode to form a circle of closed grout stopping curtain, and any two adjacent grout stopping curtain piles are meshed with each other; and secondly, foundation reinforcement high-pressure jet grouting piles are constructed in a foundation reinforcement area defined by the grout stopping curtain. According to the high-pressure jet grouting pile foundation reinforcement construction method, the multiple grout stopping curtain piles are driven at the boundary of the foundation reinforcing area to form a circle of closed grout stopping curtain, and then construction of the foundation reinforcing high-pressure jet grouting piles in the foundation reinforcing area is performed; cement paste can be prevented from flowing away along gaps of gravels or underground water during construction of the foundation reinforcement high-pressure jet grouting pile, so that the reinforcement quality of the high-pressure jet grouting foundation can be ensured; according to the foundation reinforcement construction method, engineering technical risks are reduced, construction is convenient, and the construction cost is low.

Description

technical field [0001] The invention relates to the technical field of civil construction, in particular to a construction method for reinforcing the foundation of high-pressure rotary grouting piles. Background technique [0002] The high-pressure rotary grouting pile is to use a drilling rig to drill the rotary grouting pipe and the nozzle at the design elevation of the pile bottom, pass the pre-prepared grout through the high-pressure generating device to make the liquid flow obtain huge energy, and then inject it from the nozzle at the side of the grouting pipe at a high speed. It is sprayed out to form a liquid flow with highly concentrated energy, which directly destroys the soil. During the spraying process, the drill pipe is lifted while rotating, so that the slurry and the soil are fully stirred and mixed to form a consolidated body in the soil. High-pressure rotary grouting piles are suitable for foundation soils such as silt, silty soil, flow plastic ~ plastic cla...

AI Technical Summary

Problems solved by technology

However, the following problems often occur in the construction of high-pressure rotary piles under complex geological conditions such as sandy soil with large porosity such as miscellaneous fill layers and gravel layers and fast groundwater flow: ① large porosity and serious grout leakage; ②The permeability coefficient of the sand layer is large, and under the action of high-pressure cement slurry pressure, the diffusion range of cement slurry is far beyond the scope of roadbed reinforcement; ③The groundwater flow rate is fast, and the high-pressure cement slurry is washed away under the action of groundwater seepage

If the construction is carried out according to the conventional construction technology and specification parameters in similar complex strata, the quality of foundation reinforcement is difficult to control

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