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Pile foundation full-casing full-rotation construction process under complex geological conditions

A technology with complex geological conditions and construction technology, applied in infrastructure engineering, sheet pile walls, buildings, etc., can solve problems such as easy collapse, lack of protection, material waste, etc., to achieve a firm and reliable structure, high strength and rigidity , the effect of reducing environmental pollution

Inactive Publication Date: 2019-12-31
THE NO 6 ENG CO LTD OF CHINA RAILWAY 20TH BUREAU GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, under complex geological conditions, it is easy to collapse the hole, especially in the strongly developed karst area, the form of mud retaining wall cannot play a protective role, and the amount of concrete poured is also uncontrollable, which will cause a lot of waste of materials, and the formation of boreholes The quality of cast-in-place piles cannot be guaranteed, so it is necessary to find a new way of forming holes and pouring pile foundations

Method used

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  • Pile foundation full-casing full-rotation construction process under complex geological conditions
  • Pile foundation full-casing full-rotation construction process under complex geological conditions

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Embodiment 1

[0032] refer to figure 1 , the present invention provides a kind of pile foundation full-casing full-rotation construction technology under complex geological conditions, including the following steps:

[0033] S1. Preparation before drilling:

[0034] (1) No less than 3 control piles and benchmarking points shall be set near the construction area, and the setting position shall not be affected by the pile construction as a principle;

[0035] (2) After the construction scope is determined, it is necessary to use machinery to level the site to facilitate the construction of full-casing and full-rotary drilling rigs. In addition, there must be a site of no less than 200m2 as a casing yard;

[0036] Among them, the construction of the full-casing full-rotary drilling rig is easy to cause the soft ground with insufficient strength to sink due to the weight of the main engine and the counterweight, causing the casing to tilt and unable to work; to solve this problem, pouring conc...

Embodiment 2

[0058] The difference from the first embodiment is that a steel bar ring for controlling the thickness of the steel bar protective layer is arranged symmetrically on the outside of the steel bar cage 1 .

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Abstract

The invention relates to a pile foundation full-casing full-rotation construction process under complex geological conditions. The pile foundation full-casing full-rotation construction process comprises the following steps: site preparation before drilling is conducted; casings with cutting edges are inserted in a drilling rig body, soil layers in the casings are dug through a grab, and then a self-rotation device of a drilling rig is utilized to rotate the casings and to be pressed into a formation simultaneously; the casings are spliced till drilling is completed; concrete is poured througha tremie method; and the casings are pulled out. According to a pile foundation construction method, mud does not need to be used, especially a full casing form is adopted in a strongly developed karst area, drilling and casing mounting are simultaneously conducted, and the phenomenon of hole collapse in the drilling process is avoided.

Description

technical field [0001] The invention relates to the field of mechanical construction of pile foundations, in particular to a construction technique of full casing and full rotation of pile foundations under complex geological conditions. Background technique [0002] The traditional pile foundation construction methods mainly include manual hole-digging piles and mechanical hole-forming piles. Considering construction safety risks under complex geological conditions, manual hole-digging piles are generally not used, and mechanical hole-forming piles are generally used. Pile generally adopts the form of mud retaining wall for drilling while preliminary protection. [0003] However, under complex geological conditions, holes are prone to collapse, especially in areas with strong karst development, the use of mud retaining walls cannot provide protection, and the amount of poured concrete is also uncontrollable, which will cause a lot of waste of materials. The quality of the ...

Claims

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Application Information

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IPC IPC(8): E02D5/38E02D11/00E02D5/66
CPCE02D5/385E02D5/665E02D11/00E02D2250/0007E02D2250/0023
Inventor 李魏来刘爽郝龙飞刘剑孙静
Owner THE NO 6 ENG CO LTD OF CHINA RAILWAY 20TH BUREAU GRP
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