High-strength deep solidification mixing pile and rotary drilling pile combined under-ream pile construction method

Abstract

The application relates to the technical field of bite piles and discloses a bite pile construction method combining a high-strength deep solidification mixing pile and a rotary drilling pile, which comprises the following construction steps: 1) solidifying agent is mixed with water to form solidified slurry, and the solidifying agent is formed by mixing and stirring sulphoaluminate cement, Portland cement, slag powder, desulfurized gypsum, fine aggregate, microsilica and water reducing agent; 2) a grouting pipe is arranged on a cage-type mixing head, the grouting pipe sprays the solidified slurry into the soil in the process of stirring and drilling of the cage-type mixing head, the solidified slurry is mixed with the soil, and a mixing pile is formed; 3) step 2) is repeated to form multiple mixing piles in the soil; 4) a rotary drilling pile hole is formed by drilling with a cutting tooth drill cylinder; a reinforcement cage is lowered into the rotary drilling pile hole, and concrete is poured to form a cast-in-place pile; 5) step 4) is repeated to form multiple cast-in-place piles, the cast-in-place piles are mutually engaged with two adjacent mixing piles, and the multiple mixing piles and the multiple cast-in-place piles form bite piles.

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