Spiral steel pipe shape adjusting auxiliary system and auxiliary shape adjusting method

The invention discloses a spiral steel pipe shape adjusting auxiliary system and a shape adjusting method. The spiral steel pipe shape adjusting auxiliary system comprises a pipe blank outer support device arranged below a pipe blank head, and a joint closing roller device at a limiting pipe blank head end. The pipe blank outer support device comprises a base and two or more outer support roller mechanisms arranged on the base. Support points of the outer support roller mechanisms are attached to the outer wall of the pipe blank head and are used for supporting a pipe blank to be matched withthe designed pipe diameter of a plan-machined spiral steel pipe. The joint closing roller device comprises a hanging seat, a joint closing roller mechanism slidably limited on the hanging seat, and ajoint closing roller translation mechanism driving the joint closing roller mechanism to achieve translation on the hanging seat towards the meshing center direction of a pipe blank spiral joint. Thejoint closing roller mechan