| 摘要 |
PROBLEM TO BE SOLVED: To facilitate connection of an outer pipe 13 after connecting an inner pipe at a joint section 11' in double pipe composed of the inner pipe 12 and the outer pipe 13 covering the same. SOLUTION: At least a part corresponding to the joint section of the inner pipe in the outer pipe 13 is composed of pipe 13 capable of expanding and contracting in an axial direction, and at least one end of the pipe capable of expanding and contracting is detachably connected to the outer pipe 13 by pipe joints 14, 14', 14". COPYRIGHT: (C)2006,JPO&NCIPI
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