To provide an inexpensive double pipe having an inner pipe and an outer pipe independently formed, and having a joint portion for easily connecting the double pipes with each other, and the double pipe and a connector such as a two-way branch joint, and further to provide a method of manufacturing the double pipe, and a supporting member for fixing the inner pipe and the outer pipe independently formed.
This double pipe 1 has a first pipe (inner pipe) 20 of small diameter and a second pipe (outer pipe) 10 of large diameter, and the inner pipe 20 is mounted in the outer pipe 10. This double pipe has the supporting member 30 kept into contact with an outer peripheral face of the inner pipe 20, and further kept into contact with an inner peripheral face of the outer pipe 10 to support the inner pipe 20 at a prescribed position in the outer pipe 10.
OSANAWA HIRONORI
ONO TAKASHI
SUZUKI TAKAHISA
