Construction method for increasing dry auger boring pouring pile bearing capacity

A technology of auger drilling and construction method, which is applied in the direction of sheet pile wall, foundation structure engineering, construction, etc., can solve the problems of increasing project cost, large diameter of cast-in-place pile, and difficult construction, etc., and achieves reduction of project cost and single pile bearing capacity The effect of power improvement and no mud pollution

Inactive Publication Date: 2009-07-29
李树源
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Problems solved by technology

In order to improve the bearing capacity of single piles, the cast-in-place piles designed with this construction technology often have larger diameters and too long pile lengths, making construction difficult and increasing the project cost

Method used

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  • Construction method for increasing dry auger boring pouring pile bearing capacity
  • Construction method for increasing dry auger boring pouring pile bearing capacity

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Embodiment Construction

[0009] The construction method for improving the bearing capacity of dry auger bored piles. The pile length is designed above the groundwater level, and the auger drill is used to dry drill the hole to the design depth, and the virtual soil scattered at the bottom of the hole is compacted with a rammer; Two grouting pipes 3 are symmetrically fixed on the side wall of 1 by using U-shaped clips 4. The grouting pipes 3 are PVC plastic hard pipes with a diameter of 20mm, and there are connections on the grouting pipes at the lower 1 / 3 height of the pile hole. The lower end of the grouting pipe 3 bends toward the center of the pile hole and contacts the bottom of the hole, and the side of the grouting pipe 3 that is 10 cm below the one-way valve 5 and contacts the wall of the pile hole is processed with a 6 small grouting holes 6 with a diameter of 4 mm, and 6-8 small grouting holes 6 with a diameter of 5 mm are processed on the side where the curved part of the lower part of the gr...

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Abstract

A construction method for dry screw bored cast-in-place piles. Two grouting pipes are symmetrically arranged on the side walls of the pile holes, a steel cage is placed in the pile holes, and then concrete is poured. After 8-24 hours after the pile is formed, the cement slurry is injected into the soft soil of the pile side and pile bottom through the grouting pipe. The slurry is added with a concrete pumping agent of 1% by weight of the cement and a concrete expansion agent of 5%. The pumping pressure It is 200-300kg / cm2 until the upper end of the pile side has a slurry. The invention can more than double the bearing capacity of the single pile, thereby greatly shortening the length of the single pile, enabling most construction projects to form piles above the groundwater level, saving materials, reducing construction costs and reducing construction pollution.

Description

technical field [0001] The invention relates to a pile foundation engineering construction method, in particular to a construction method of a dry auger bored cast-in-place pile. Background technique [0002] At present, most high-rise buildings use bored pile foundations in order to meet the design bearing capacity and settlement requirements. Dry auger bored pile construction is an economical and environmentally friendly pile foundation construction technology, but it is only suitable for construction above the groundwater level, so the pile length can only be designed above the groundwater level. In recent years, as the design height of buildings continues to increase, the requirements for the bearing capacity of pile foundations are also getting higher and higher. The construction technology of dry auger bored piles has been greatly restricted, and it has almost been used in areas with rising groundwater levels. disuse. In order to increase the bearing capacity of a si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/34E02D5/62
Inventor 李树源高同王传家
Owner 李树源
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