Large diameter cement soil pile construction method

Abstract

The invention discloses a large diameter cement soil pile construction method. The large diameter cement soil pile construction method includes: using a rotary drilling machine for performing rotary soil fetching to form a hole, gradually performing the soil fetching for forming the hole and stopping drilling until reaching the designed pile bottom elevation, then injecting cement slurry into thebottom of the hole, replacing a drill bit of the rotary drilling machine with a stirring drill bit, placing the stirring drill bit at the bottom of the hole for stirring the bottom of the hole, then adding backfill materials in the hole in batches, lifting the stirring drill bit while rotating and stirring, and completely stirring the cement slurry and the backfill materials uniformly from the bottom up so as to solidify the cement slurry and the backfill materials into a pile. The large diameter cement soil pile construction method solves the puzzles that in a compact stratum, mechanical ability is restricted, stirring resistance is large, and construction efficiency is low by adopting the hole preforming technology, achieves substantial enlargement of the diameter of the pile, obtains astable pile shape, uses drilling cuttings as pile forming materials in the backfill materials, reduces environment pollution and resource waste, more easily stirs for mixing the materials uniformly, guarantees construction quality, can guarantee cement soil strength of the pile body by controlling a cement ratio, and facilitates guarantee for stirring uniformity of the pile body by placing the cement in the hole in advance.

Description

technical field [0001] The invention belongs to the technical field of engineering construction, in particular to construction technologies such as pile foundation engineering, composite foundation of foundation treatment engineering, enclosure and retaining wall of foundation pit engineering, passive area reinforcement, anti-seepage curtain, etc. in the field of engineering construction, and particularly relates to a large Construction techniques for diameter cement-soil piles. Background technique [0002] When engaging in engineering construction, we often encounter weak strata such as silt (mass) soil, fill soil, cohesive soil, silt, fine sand, medium-coarse sand, saturated loess, or unfavorable geological conditions such as high groundwater level. Cement-soil piles are often used in foundation treatment and foundation pit support due to their relatively low cost and simple construction technology. Common construction methods include deep mixing method and high-pressure ...

AI Technical Summary

Problems solved by technology

From the scope of application: the construction process is limited by the size of the mixing blade and the stirring power. If it encounters a dense stratum, such as hard plastic, hard cohesive soil or soil layer containing boulders and large pieces of construction waste, it cannot be implemented at all.

From the perspective of construction quality, the diameter of the pile formed by this construction method is relatively small, and when stirring at a deeper position, it is easy to have excessive rotation resistance of mechanical equipment and uneven mixing, which will affect the quality of the pile.

From the perspective of ergonomics, the lifting or sinking of the agitating drill per revolution is only 10mm to 15mm, and it needs to be reciprocated several times, and the construction progress is slow

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