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

摘要

The present invention aims to provide a connection structure of metal-resin composite pipes that eliminates the need for arranging thick connection flanges and realizes easy connection work. A diameter-expanded part 4 is formed at an opposing end 10 of a first metal-resin composite pipe 1A by pressurizing and deforming outward a reinforcing convex part 3 including the one end 10 together with a main body 2 positioned inside the reinforcing convex part. A diameter-reduced part 5 is formed at the other end 11 of a second metal-resin composite pipe 1B by pressurizing and deforming inward at least the reinforcing convex part 3 including the other end 11. The diameter-reduced part 5 is inserted into the diameter-expanded part 4. A sealing member 6 is interposed in a gap between an inner surface of the diameter-expanded part 4 and an outer surfaces of the diameter-reduced part 5.