Construction method for reconstruction and expansion of expansion pipe of drainage pipe network

The invention provides a drainage pipe network reconstruction and expansion pipe expansion construction method, and relates to the technical field of drainage pipe network reconstruction and expansion. According to the construction method, an inspection opening supporting frame, a connecting rod rotating traction device, a plurality of conical head connecting rods, a connecting conical head, an old pipeline crushing cutterhead assembly, a pipeline pulling and disassembling assembly and a plurality of rivet assemblies are included; the connecting rod rotation traction device comprises a connecting rod clamp, a clamp fixing bearing, an outer fixing frame, a clamp gear, a motor fixing frame, a transmission motor and a motor gear, the connecting rod clamp is connected to an inner supporting point of the clamp fixing bearing, and the outer fixing frame is connected to an outer supporting point of the clamp fixing bearing; the clamp gear is connected to the rear side wall of the connecting rod clamp. By means of th