Sludge geology PHC tubular pile internal pile cutting construction method

The invention discloses a sludge geology PHC pipe pile internal pile cutting construction method, a sludge geology PHC pipe pile internal pile cutting device comprises a driving motor and a cutting structure, the cutting structure comprises a rotating disc extending into a PHC pipe pile and a plurality of cutters arranged on the rotating disc, the driving motor drives the rotating disc to rotate, and the cutters are arranged on the rotating disc; the cutters rotate along with the rotating disc to cut the inner wall of the PHC pipe pile. The rotating disc is further provided with a telescopic structure for driving the cutters to move in the radial direction of the rotating disc, and the telescopic structure can drive the cutters to move in the radial direction of the rotating disc and keep the same depth in the axial direction of the PHC pipe pile under rotation of the rotating disc so as to cut off the PHC pipe pile. The method has the effect that the PHC pipe pile is firstly cut off so as to reduce the influ