Construction method for drainage cement mixing pile

A technology of cement-soil mixing piles and construction methods, which is applied to sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of complex process, high cost, and long construction period, and achieve the effect of sufficient and uniform mixing

Active Publication Date: 2014-05-07
SOUTHEAST UNIV
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Problems solved by technology

[0005] Technical problem: In order to solve the shortcomings of the current cement-soil mixing piles in high liquid limit clay areas that do not have drainage function, and other fou

Method used

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  • Construction method for drainage cement mixing pile

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Embodiment Construction

[0025] Utilize the principle that high liquid limit clay is mixed with low content (mixing ratio is generally less than 5%) cement or other modifiers (such as lime) to improve its permeability coefficient, combined with the new nail-shaped cement-soil two-way mixing pile The machine tool drives the outer drill pipe 4 and the inner drill pipe 5 to rotate in opposite directions in the foundation soil at the same time through the power device 1 on it, and the first sinking sprays low-volume (mixing ratio is generally less than 5%) cement or Other modifiers that can improve the permeability coefficient of clay, by controlling the direction of rotation, the fixed end 8 of the blade and the foldable blade 9 are in a stretched state to form a large-diameter drainage body 1, and a high dosage is sprayed during the rising process (the mixing ratio is generally not less than 10 %) cement or other solidifying agents that improve the strength of the soil, by rotating the outer drill rod 4 ...

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Abstract

The invention discloses a construction method for a drainage cement mixing pile. According to the principle that the permeation coefficient of high liquid limit clay can be increased by doping low-dosage cement or other modifiers (such as lime) into the high liquid limit clay, the stirring diameter is adjusted by changing the rotating direction of a blade in combination with a novel nail-shaped cement bidirectional stirring pile machine tool emerging currently, and low-dosage (the dosing ratio is generally less than 5 percent) cement or other modifiers (such as lime) which can be used for increasing the clay permeation coefficient is sunk and sprayed for the first time to form a large-diameter drainage body. In a rising process, high-dosage (the dosing ratio is generally not less than 5 percent) cement or other curing agents which can be used for enhancing the strength of a soil body is sprayed in a rising process, and reverse rotation is performed to form a small-diameter central pile body. The large-diameter pile body is mainly used for increasing the permeation coefficient of the soil body and releasing water pressure from apertures. The small-diameter pile body is mainly used for enhancing the foundation bearing capacity. The problems of slow release of water pressure from the apertures of the soil body and low strength in a high liquid limit clay area, and complex process and high manufacturing cost in other foundation treatment methods are solved.

Description

technical field [0001] The invention relates to a construction method of a novel drainage cement-soil mixing pile, which is suitable for areas with high liquid limit soft clay and belongs to the technical field of civil engineering. Background technique [0002] High liquid limit soft clay has the characteristics of high water content, low permeability coefficient, high compressibility, and low bearing capacity. Therefore, it is necessary to take drainage measures for the foundation or deep reinforcement before other follow-up construction can be carried out. Most of them involve drainage preloading and composite foundation. In the engineering practice of highway foundation treatment, cement-soil mixing pile is a common form of composite foundation. In recent years, some innovations have appeared in the composite foundation technology of traditional cement-soil mixing piles. For example, Dong Ping of Nanjing University proposed to insert small-diameter prefabricated concret...

Claims

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Application Information

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IPC IPC(8): E02D5/36
Inventor 张彤炜宋国森邓永锋刘松玉
Owner SOUTHEAST UNIV
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