Sludge sediment and gravel combined cast-in-place pile open type post-grouting construction technology

The invention relates to a mud sediment and gravel combined cast-in-place pile open type post-grouting construction technology. The technology comprises the following steps that expansive cement paste with the relative density being 1.3-1.5 is used for punching; the large-particle suspended sludge is sunk into the bottom of the pile hole through a slurry flocculant, and then graded broken stone is put into the pile hole; pouring the cast-in-place pile; and grout is poured into the soil-rock mixture. The method has the beneficial effects that the high-weight slurry is adopted to improve the slurry wall protection quality, then the pile forming quality of the cast-in-place pile is improved, the means of promoting slurry precipitation is adopted to accelerate hole cleaning, and the graded broken stone is put to solve the problem that much sludge generated during wall protection of the high-weight slurry is difficult to remove, so that the sludge and the broken stone are mixed to form a soil-rock mixture, and the