Connection structure of metal-resin composite pipes and metal-resin composite pipe for use in the connection structure

A connection structure of metal-resin composite pipes for connecting two metal-resin composite pipes with each other at ends thereof, each of the metal-resin composite pipes including a main body made of synthetic resin with an almost flat inner surface and a reinforcing convex part formed of a metal member provided spirally around a periphery of the main body, wherein:

• a first one of the metal-resin composite pipes is provided with a diameter-expanded part at an opposing end thereof by pressurizing and deforming outward the reinforcing convex part including the end together with the main body positioned inside the reinforcing convex part;
• a second one of the metal-resin composite pipes is provided with a diameter-reduced part at an opposing end thereof by pressurizing and deforming inward at least the reinforcing convex part including the end;
• the diameter-reduced part of the second metal-resin composite pipe is inserted into the diameter-expanded part of the first metal-resin composite pipe;
• and a sealing member is interposed in a gap between an inner surface of the diameter-expanded part and an outer surface of the diameter-reduced part.