High-pressure jet grouting pile auxiliary construction device for water-rich soft mucky soil

The invention relates to a high-pressure jet grouting pile auxiliary construction device for water-rich soft mucky soil. The high-pressure jet grouting pile auxiliary construction device comprises a drill rod body, a sleeve, a position switching mechanism, a spiral soil pumping mechanism, a soil discharging mechanism and a water pumping and draining system. During drilling, the spiral soil pumping mechanism guides the drill rod main body and the sleeve to drill into a soil layer and conveys soil to the upper end of the sleeve at the same time, and the soil discharging mechanism discharges the soil outwards; in the rotary spraying working state, after the protruding length of the drill bit at the lower end of the sleeve is increased through the position switching mechanism in advance, the water pressure of a soil layer is synchronously adjusted through the water pumping and draining system while the drill rod body is guided by the spiral soil pumping mechanism to be upwards pumped out of the soil layer, and th