Main claim: 1. A prefabricated spiral fitting comprising a pile body and a pile tip, characterized in that the pile body comprises a precast concrete pile disposed above and a steel pipe pile disposed below, the pile body end a rotating cap, a lower end of the pile is provided with a pile tip, and a top of the pile tip is provided with a ring-shaped steel plate for reducing the friction of the pile soil, and the diameter of the annular steel plate is larger than the diameter of the pile body by 1 to 5 cm. The surface of the pile body is provided with a spiral groove arranged along the length of the pile body.
A concrete prefabricated spiral fitting for building, which mainly comprises a pile core with a trapezoidal section spiral disk on an outer circular surface, a pile body formed by dividing the upper and lower end plates of the inner end of the pile core, and an end plate and an end plate The upper end of the wing plate and the two plugging end plates with two opposing pressure pads for the grouting hole, the through hole in the pile core and the square inner hole and the lower end plate of the upper end plate are rounded The inner hole and the grouting hole of the end plate are connected. The prefabricated pile can reduce environmental and noise pollution during construction, and the process is simple, which can greatly save labor and improve construction efficiency.
