Fixing device for controlling duct piece to float upwards

The utility model discloses a fixing device for controlling a duct piece to float upwards, which comprises a duct piece fixing device, a grouting spiral pipe and a grouting straight pipe, the grouting straight pipe is connected with the grouting spiral pipe, the grouting spiral pipe is arranged on the periphery of the duct piece fixing device, and the duct piece fixing device comprises a duct piece fixing rod and an inner hexagonal hole; a check valve is arranged inside the joint of the grouting spiral pipe and the grouting straight pipe, and a grouting pipe sealing ring is arranged outside the joint of the grouting spiral pipe and the grouting straight pipe. According to the fixing device for controlling the duct piece to float upwards, the problems that the duct piece of a shield tunnel in a full-section (water-rich) hard rock stratum and a (water-rich) upper-soft and lower-hard stratum is prone to dislocation, fracture, water leakage and the like due to the fact that the duct piece floats upwards are well