Construction method of static pressure compaction pile

Abstract

The invention discloses a construction method for static-pressure compaction piles. The construction method comprises the following construction steps of leveling land, measuring, positioning, putting a pile driver in position, leveling, lifting a pore-forming device in, centering and aligning a pile body, starting a static-pressure pore-forming device, stopping and pulling out the static-pressure pore-forming device, inspecting a pile hole; displacing the pile driver, putting a rammer machine in position, cleaning the hole, filling and capping with plain soil. The construction method adopts the hydraulic static-force pile driver for static-pressure pore formation, has no noise or air pollution, can ensure the environment-friendly construction of geotechnical engineering, is fast in construction speed, guarantees construction quality, is little in disturbance to surrounding soil, produces no hole shrinkage, is high in pore-forming quality, stable in construction quality, wide in application range, capable of constructing in hard strata and foundations, easy to popularize, favorable for saving energy and increasing efficiency and good in social and economic benefits.

Description

1. Technical field: [0001] The invention relates to a foundation treatment method, in particular to a construction method of a static pressure compaction pile. 2. Background technology: [0002] With the development of western my country and the large-scale construction of highways and express railways, the requirements for the bearing capacity of foundation soil are getting higher and higher, the depth of foundation treatment is getting deeper and wider, and the scope of foundation treatment is getting wider and wider. There is a large area of ​​collapsible loess in the west of my country. The biggest characteristic of collapsible loess is that it will undergo a sharp and large amount of additional subsidence when it is soaked by water under the joint action of the soil's own weight stress and additional stress. In view of the collapsibility of loess, forced method, chemical treatment method, compaction pile method, soil cushion replacement method, presoaking method, etc. a...

AI Technical Summary

Problems solved by technology

[0011] 1) When using the method of hammering immersed tubes to form holes, the main equipment is diesel pile drivers, and diesel hammers will produce noise pollution and environmental pollution during the construction process, which is undoubtedly a fatal shortcoming in today's advocacy of green construction

[0012] 2) During the construction process, during the hole forming process, due to the extrusion of the pile tip to the surrounding soil, a vacuum will be generated around the pile tip, thereby generating ultra-static pore water pressure, which will cause difficulty in extubation. The phenomenon of "unable to pull out" after extubation

[0013] 3) When drilling holes by vibrating immersed tubes and hammering immersed tubes, use steel wire ropes to lift the hole forming device. When the hole depth is deep and the side wall resistance is relatively large, the lifting force of the hole forming device is very large. poor construction safety

[0014] 4) Due to the effect of impact energy in the process of hole formation, the hole wall will be disturbed, and the quality of hole formation is not easy to guarantee

Easy to cause hole collapse

[0015] 5) Vibration-immersed tube forming and hammering-immersed tube forming methods have high requirements on the ground conditions, and cannot be normally constructed when encountering relatively hard soil layers

[0016] 6) The method of vibrating and sinking tube forming holes and hammering sinking tube forming holes greatly disturbs the formation, and the diameter of the holes is easy to shrink after forming holes, making it impossible to fill the soil, and the soil must be excavated by mechanical shoveling in Luoyang, and the compaction cannot be achieved. Effect

Images