Settling, reinforcing, jacking and leveling technology suitable for independent pile foundation of industrial plant

Abstract

The invention discloses a settling, reinforcing, jacking and leveling technology suitable for an independent pile foundation of an industrial plant. The technology comprises the steps that a soft soillayer around a pile is subjected to compaction grouting for reinforcement at first, specifically, the reinforcing depth is gradually increased in layered and downward modes, the grouting pressure isgradually increased, each grouting section is 0.5-1.0 m long, drilling continues for 0.5-1.0 m after the first grouting section is grouted, then the second grouting section is grouted, and operation is carried out downwards section by section until compaction grouting is completed; and drilling continues downwards 12-24 h after the soft soil layer around the pile is reinforced, upward counterforceis formed in a high-pressure grouting mode, and a pile foundation is slowly jacked to the design allowable deviation range. The independent pile foundation is reinforced in a wrapped state by adoption of a reinforcing and jacking method, good integrality and high stability are achieved, the integral foundation bearing capacity is improved, and meanwhile the jacking and leveling purposes can be achieved; and by adoption of the drilling and injection integrated advancing grouting process, the situation that the soil layer settles for the second time due to water-weakening impact of the soil layer in the drilling process can be avoided, the slurry initial setting time is short, the diffusion radius is controllable, the cementing capacity is high, the strength is high, and environment friendliness and no pollution are achieved.

Description

technical field [0001] The invention relates to the technical field of pile foundation reinforcement, in particular to an independent pile foundation settlement reinforcement jacking and leveling technology suitable for existing buildings without caps. Background technique [0002] Before building construction, the backfill soil layer or weak foundation with a large depth should be treated. In the absence of natural foundation, most buildings need to be piled as the foundation, and then the superstructure should be constructed. Because the foundation treatment is not dense, the foundation soil layer has a large compressibility, and the foundation bearing capacity is insufficient; or with the change of groundwater discharge conditions, the groundwater erosion phenomenon is formed, resulting in a decrease in the foundation bearing capacity; or due to the existence of pile ends and bedrock Weak interlayer; or the slope of the rock surface is large, and the depth of the pile tip...

AI Technical Summary

Problems solved by technology

Because the foundation treatment is not dense, the foundation soil layer has a large compressibility, and the foundation bearing capacity is insufficient; or with the change of groundwater discharge conditions, the groundwater erosion phenomenon is formed, resulting in a decrease in the foundation bearing capacity; or due to the existence of pile ends and bedrock Weak interlayer; or the slope of the rock surface is large, and the depth of the pile tip into the rock is not enough to cause side slip; or the soil layer around the pile is loose and the soft friction coefficient is low, which leads to uneven settlement of the pile foundation

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