Pile forming operation method for protection barrel type cement soil mixing pile

Abstract

The invention relates to a pile forming construction method for a protection barrel type cement soil mixing pile machine. The pile forming operation method is suitable for treatment of sludge, mucky soil and other soft soil foundations. The protection barrel type cement soil mixing machine is mainly composed of a crawler belt type mixing machine pile frame, a mixing machine power head, a protection barrel power head, a mixing shaft, a protection barrel, a drill bit, a supporting frame, mixing blades and the like. A slurry spraying pipe, a water spraying pipe and a material spraying pipe which are arranged in parallel are arranged in the protection barrel. When a cement soil mixing pile is formed, the protection barrel conducts cutting and drilling under the action of the protection barrel power head, the mixing machine power head carries a drill rod for rotary jet grouting following, and in the sinking mixing process of the mixing shaft, the slurry spraying pipe sprays slurry, the material spraying pipe sprays materials, and the water spraying pipe sprays water or slurry according to the stratum condition and the construction need. In the elevating mixing process of the mixing shaft, the protection barrel power head is closed, and the stirring shaft conducts mixing during slurry spraying to the preset slurry stopping face. The mixture and the slurry liquid are sufficiently mixed with an in-situ soil body in the closed protection barrel, the uniform degree and strength of a pile body are improved, and diffusion and flowing away of the slurry liquid of a curing agent are avoided.

Description

technical field [0001] The invention belongs to the technical field of building construction, and specifically refers to a pile-forming operation method of a casing-type cement-soil mixing pile, which is mainly used in the treatment of soft soil foundations such as silt, muddy soil, and sandy soil layer with a certain thickness or hard soil. and deep foundation pit support. Background technique [0002] The cement-soil mixing pile uses cement as the main agent of the curing agent. Through a special deep mixing machine, the curing agent and the foundation soil are forcibly stirred to make the soft soil harden into a pile body with integrity, water stability and certain strength. ground treatment method. This foundation treatment method has the characteristics of low investment cost, remarkable treatment effect, low vibration and noise, low environmental pollution, and short construction period. It is currently widely used in construction fields such as foundation treatment, ...

AI Technical Summary

Problems solved by technology

However, the effect of increasing the cement content or adding additives to improve the strength and bearing capacity of cement-soil mixing piles in silt and muddy soil is not obvious, and it is easy to cause waste of cement materials

The uniformity of cement and soil mixing can be effectively improved by increasing the number of stirring times, but there is a problem of cement slurry passing away during construction in silt and silty soil with high water content, and due to the thixotropy of silt and silty soil, cement It is difficult to mix the slurry and the undisturbed soil evenly

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