Construction method for reinforcing pile-soil composite foundation

Abstract

The invention discloses a construction method for reinforcing a pile-soil composite foundation. The method includes the steps that a centroid position of a soil body between minimum unit piles is calculated according to a pile arrangement form of the pile-soil composite foundation, a grouting hole is dug in the centroid position of the soil body between the piles by utilizing a Luoyang shovel, and the situation that the grouting hole is vertically formed is ensured; a grouting pipe of a grouting system is vertically placed in the center of the grouting hole and directly reaches the bottom of the grouting hole, packing is placed in the grouting hole around the outer wall of the grouting pipe for sealing, and the grouting hole is divided into an upper half portion and a lower half portion through the packing; and the upper half portion of the grouting hole is backfilled, the grouting system is started to conduct self-permeation grouting of water glass or alkali liquor into the grouting hole, and a small pile reinforcing body is formed, so that the pile-soil composite foundation is reinforced by the small pile reinforcing body. According to the construction method for reinforcing the pile-soil composite foundation, on the premise that loess collapsibility is not eliminated, the pile spacing of existing plain concrete piles is kept unchanged, and the small pile reinforcing body is formed at the center of the soil body between the piles by adopting the simple, convenient and low-cost method, so that the working performance of the composite foundation is effectively improved.

Description

technical field [0001] The invention belongs to the field of pile-soil composite foundation reinforcement, and in particular relates to a construction method for reinforcing pile-soil composite foundations. Background technique [0002] The stress state and collapsibility characteristics of the soil between the piles in the self-weight collapsible loess site are different from those in the natural site. After the loess between the piles is immersed in water, the subsidence occurs, and the vertical stress is affected by the sharing effect of the piles and the negative friction resistance. The process of soil collapsibility between piles is accompanied by the decrease of vertical pressure, which belongs to unloading collapsibility. Therefore, in the self-weight collapsible loess site, the soil between the piles of the composite foundation, the soil between the cast-in-situ piles and the soil between the prefabricated piles all have the problem of unloading collapsibility. Acc...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method for reinforcing the pile-soil composite foundation, so as to solve the problem of insufficient bearing capacity of the pile-soil composite foundation due to the collapsing of the soil between the piles under the influence of water seepage or flooding. The problem of deformation exceeding the allowable value

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