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Collapsible loess geology static pressure compaction pile construction method

A technology of collapsible loess and construction methods, which is applied in the field of construction engineering, can solve the problems of high noise disturbance, difficulty in verticality, and high cost of hole formation, and achieve the effects of no noise disturbance to residents, easy promotion, and fast hole formation speed

Pending Publication Date: 2022-04-12
RAILWAY TENTH GROUP NORTHWEST ENG
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Problems solved by technology

[0003] Traditional construction usually adopts the compaction pile construction method of hammer sinking tube forming hole, vibrating sinking tube forming hole and impact hole forming, which has the advantages of small hole forming depth, slow speed, poor quality, difficult to control verticality during construction, and large construction vibration , Disadvantages of high noise and disturbing residents, and high hole forming cost

Method used

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  • Collapsible loess geology static pressure compaction pile construction method

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Embodiment 1

[0045] The proposed site of a project in a certain place is a self-weight subsidence loess site, and plain soil compaction piles are used to treat the foundation. The absolute elevation of ±0.000 is 592.30, the elevation of the piling surface is -2.400, the pile diameter is designed to be 560mm, the effective pile length is 13.5m, and the distance between the pile centers is 1250mm, arranged in an equilateral triangle, the design elevation of the pile top is -3.000m, and the pile top is reserved The thickness of the soil layer is 600mm. Before the foundation construction, the virtual pile head and the reserved soil layer above the design elevation of the pile top should be completely excavated, and after the excavated loose layer is compacted, a 500mm thick 1:6 cement-soil cushion should be made, and the compaction The coefficient shall not be less than 0.97. The bottom of the hole should be compacted before filling. The filling in the hole should be backfilled and tamped la...

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Abstract

The invention discloses a static pressure compaction pile construction method for collapsible loess geology, which adopts a plain soil compaction pile to treat a foundation, and performs static pressure compaction pile construction through original ground treatment, measurement positioning, static pressure pore forming, pore forming inspection, filler moisture content test, plain soil layered ramming and filling, comprehensive inspection and pile forming. The static pressure compaction pile construction problem of the collapsible loess geology is effectively solved, the construction is safe, the quality is reliable, the progress is fast, the input cost is low, and compared with traditional compaction pile construction methods such as hammering immersed tube hole forming, vibrating immersed tube hole forming and impact hole forming, the static pressure hole forming cost is high, and the construction efficiency is high. However, compared with a CFG pile and a prefabricated square pile with the same foundation treatment effect, the investment cost of the static pressure compaction pile is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a construction method for collapsible loess geological static pressure compaction piles. Background technique [0002] Collapsible loess geology, especially clay loess and hard plastic clay loess, and hard soil strata containing ginger stones, collapsible loess is a very special kind of soil, which belongs to the category of sandy loam, but its properties are different. Different from sandy loam soil, it has large pores visible to the naked eye in the natural state. The natural section shows vertical joints, coarse particles, dry soil, and the color is light yellow when dry, yellow when slightly wet, and brown when wet. Yellow; strong water absorption and water permeability, poor plastic cohesion, not easy to bond, and the soil sample will disintegrate quickly after being immersed in water; in a dry state, it has high strength and low compressibility; after conta...

Claims

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Application Information

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IPC IPC(8): E02D33/00E02D3/08E02D7/20E02D3/046E02D9/02
Inventor 张宏波李向阳焦松松郭晓峰李明祁明贞雷夏杰
Owner RAILWAY TENTH GROUP NORTHWEST ENG
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