| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve an offset yield strength in a pipeline connection structure where a pipeline end of one of connection target pipes A, B includes a sheath pipe 2 to which an insertion pipe 1 connected to a pipe end of the other connection target pipe A is inserted tightly, a lock projection part is formed in the insertion pipe 1, an engage recessed streak part 21 to engage the lock projection part 11 and an opening end notched part 24 which allows the lock projection part to enter the recessed streak part are formed on an inner peripheral surface in the vicinity of an end portion of the sheath pipe, and the lock projection part is positioned within the engage recessed streak part, thereby implementing pipe connection. <P>SOLUTION: Lock projection parts 11, 12 are formed over a plurality of stages in such a manner that distances from end portions are different and angles of formation positions in the pipe outer periphery are different, and engage recessed streak parts 21, 22 are also formed over a plurality of stages. Between the front-side and deep-side engage recessed streak parts, a communication recessed part 25 is provided through which the lock projection part 11 can pass, at an angle corresponding to the formation angles of the lock projection parts, and the lock projection parts on the respective stages are engaged to the lock recessed streak parts on the respective stages, thereby performing pipe connection. <P>COPYRIGHT: (C)2013,JPO&INPIT |
