| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint of segments enabling reliable and easy junction while making it possible to easily join mating surfaces together in a proper condition when the segments are joined together. SOLUTION: A female member 2 provided with a cylindrical locking hole 3 in its center is embedded in one mating surface 1a of the segment 1 along the axis of a tunnel. A male member 4 taking the form of a cylinder protruding outwards from the other mating surface 1b and having a member length L<SB>2</SB>longer than the depth L<SB>1</SB>of the locking hole 3 is mounted to the other mating surface 1b. The member thickness of the male member 4 is formed to decrease from a connection 4b with the segment 1 to a tip 4a. The tip 4a of the male member 4 is butted against the bottom 3b of the locking hole 3 and the male member is pressed in until the one mating surface 1 of one segment 1 makes contact with the other mating surface 1b of the other segment 1, thereby forming the ring joint 5 of the segments 1. COPYRIGHT: (C)2003,JPO
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