Self-expansion type compaction pile construction method

Abstract

The invention relates to a self-expansion type compaction pile construction method. Quicklime is mixed with gravels or rubbles, cement and coal ash are added, layering tampering and filling are conducted, and a self-expansion type compaction pile is constructed. The material character that quicklime and the like are expanded in volume after encountering water but shrinkage is avoided is utilized,the quicklime is mixed with the good-self-sealing-performance gravel or rubble materials, and the cement, the coal ash and other gel materials are properly added; and based on an existing compaction pile or column punching expansion pile (a prebored hole compaction pile is included) construction technology, after layering tampering and filling are finished for a pile body, after pile body materials absorb water in the soil body, the materials are expanded, foundation soil is further compacted, the foundation treatment effect can be improved, or the quality defects in the existing constructiontechnology are overcome.

Description

technical field [0001] The invention relates to the technical field of civil construction, in particular to a construction method of a self-expanding compaction pile. Background technique [0002] According to the current "Technical Specifications for Building Foundation Treatment" and "Technical Regulations for Railway Engineering Foundation Treatment", lime soil is often used for the treatment of silt, cohesive soil, plain fill, miscellaneous fill and collapsible loess above the groundwater level. (Soil) compaction piles or post-hammer punching expansion piles (including pre-drilled compaction piles) measures, the particle size of the compacted material is required during the processing process, and the soil particle size should not be greater than 15mm, and the lime particle size should not be greater than 15 mm. Greater than 5mm. [0003] (1) The construction process of lime-soil (soil) compaction piles is hole forming, lime-soil (soil) preparation, and layer-by-layer r...

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Problems solved by technology

[0006] 3) The self-tightness of lime soil (soil) is poor, and the layered compaction quality of the filler in the hole is mainly controlled by manual operation, and the construction quality is unstable. figure 1 In the middle "pile body boundary line after tamping and filling in the pile hole", it retracts into the hole, which affects the effect of foundation treatment

[0007] 4) When the natural water content in the ground is high, the soil on the pile hole wall will appear rubbery soil during the tamping and filling process, which increases the difficulty of hole expansion

Its problems are similar to those of lime-soil (soil) compaction piles, the only difference and fatal is: if figure 2 The "design pile body boundary line" is often larger than the "hole wall boundary line", mainly relying on the layered filling in the hole and the impact reaming control during layered column hammer tamping. It is difficult to control the quality of impact reaming. When the impact force of the hammer is small, it is difficult to achieve the "design pile boundary line" by tamping, filling and reaming, which will affect the effect of foundation treatment. Especially in the extreme situation where the tamping and filling in the hole is not compact, it will not only fail to meet the expected requirements of treatment, but will even deteriorate Foundation conditions

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