Self-locking type tool for hoisting lower pipe of concrete prefabricated pipeline

The utility model belongs to the technical field of pipeline hoisting, and particularly relates to a self-locking type tool for hoisting a lower pipe of a concrete prefabricated pipeline, which comprises a fixing frame and a hoisting ring fixedly connected to the surface of the fixing frame, a concrete pipeline is arranged below the fixing frame, and an adjusting assembly is arranged on the surface of the fixing frame; worms are rotated to drive two sets of first screws to rotate through worm gears, then two sets of arc-shaped frames are pushed to move through fixing rods, the fixing positions of the arc-shaped frames and arc-shaped plates on the pipelines are adjusted, and the pipelines with different lengths can be hoisted conveniently; the two sets of first screws are symmetrically arranged to ensure that a hoisting ring is located at the center of the whole device; and the bottom of the concrete pipeline is supported through arc-shaped plates on the two sides, the moved arc-shaped plates can be locked thr