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.