| 摘要 |
PROBLEM TO BE SOLVED: To simplify and speed up assembling work of an injection pipe by constructing an outer pipe put on the outer peripheral side of an injection pipe body and a connection pipe of an integrated pipe, and interposing a seal ring member between the vicinity of a large diameter pipe side end of the outer pipe constructed of the integrated pipe and an outer circumferential surface of the opposite outer pipe. SOLUTION: In fabricating an injection pipe body 1, first under the condition where one connection head 1-1 is formed at one end thereof, an outer pipe 2-1 integrally formed with a connection cylinder part is superposed on an outer peripheral side of the body 1, while it is engaged with one fastening nut 3-1 incorporated in an outer end thereof through a washer 5a and a sealing member 4a. Secondary, after another outer pipe 2-2 whose end is engaged with another fastening nut 3-2 via a seal ring 4b in the similar manner from another end of the body 1 is superposed, an outer pipe 2-2 and the fastening nut 3-2 are punched under the condition that it is moved to the side of connection head 1-1 so as to form a connection head at another end.
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