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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  • 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 al

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example one:

[0032] Reference figure 1 , For the present invention to provide a full-rotation construction process of a full-pipe pile foundation under complex geological conditions, including the following steps:

[0033] S1. Preparation before drilling:

[0034] (1) Set up control piles and leveling points near the construction area, no less than 3, and their setting positions are not affected by pile construction as the principle;

[0035] (2) After the construction scope is determined, the site needs to be leveled with machinery to facilitate the construction of the full-pipe full-rotation rig. In addition, there must be a site of no less than 200m2 as a casing yard;

[0036] Due to the weight of the main machine and counterweight, the construction of the full-tube full-rotation rig is likely to cause the soft ground with insufficient strength to sink, causing the casing to tilt and unable to work; for this problem, concrete can be poured according to the geology of the con...

Example Embodiment

[0057] Embodiment two:

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