| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress adherence deterioration of a corrosion proof core and easily correspond to change of an in-pipe circumference. <P>SOLUTION: The fixing ring 10 is provided on a pipe end part inner surface of the pipe end corrosion proof core 7, and the corrosion proof core 7 is fixed to a pipe end by the fixing ring 10. The fixing ring 10 has one split in a circumferential direction, its both ends 11 and 13 are overlapped, an annealed locking piece 15 of one end 13 is inserted through another end 11, and a diameter reduction preventing function of the fixing ring 10 is provided by folding back the locking piece 15. Since the annealed locking piece 15 is easily bent and securely folded, a locking state stabilizes. A plurality of neck parts 11a are formed on the other end 11 of the fixing ring 10, and loosening is prevented by slidably inserting the other end 11 through an oblong hole 14 of the one end 13 via an optional neck part 11a. By movement of the other end 11 in the oblong hole 14 in a loosening prevented state, diametral expansion of the fixing ring 10 is smoothly adjusted. By selecting an optional neck part 11a, it is easy to correspond to change of the in-pipe circumference. <P>COPYRIGHT: (C)2003,JPO</p> |
