MULTIPLE PIPE EXCELLENT IN BENDABILITY

摘要

PROBLEM TO BE SOLVED: To provide a multiple pipe which is excellent in bendability and manufactured at a low cost in addition to the basic characteristic requested for the multiple pipe such as heat insulating property and sound insulating property. SOLUTION: In the multiple pipe with a plurality of pipes overlapping with a space therebetween, an outer pipe 1 and an inner pipe 2 having different sections are closely brought into contact with at least linear or strip-like contact parts 4 from one end to the other, and the spaces formed between the two pipes are a plurality of communicated spaces 10 demarcated at the contact part 4.