Pipe joint, tower drum, pipe piece assembly and mold assembly thereof

The utility model discloses a pipe joint, tower drum, duct piece subassembly and mould subassembly, said duct piece subassembly includes first duct piece and second duct piece, the first duct piece includes first plate body and preinstalled first casing pipe in the first plate body, the first casing pipe has the first through-hole that runs through along the width direction of first plate body; the second pipe piece comprises a second plate body, third plate bodies and second sleeves preset in the third plate bodies, the third plate bodies are arranged on the two sides of the second plate body in the width direction, the width direction of the second plate body intersects with the width direction of the third plate bodies, and the second sleeves are provided with second through holes penetrating in the width direction of the third plate bodies; the surfaces of the first plate body, the second plate body and the third plate body are planes, and the first through hole and the second through hole are suitable fo