| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of types of segments of a segment ring structure for tunnel lining. SOLUTION: This segment ring structure for tunnel lining in which corners are formed at at least four corners is used for forming the tunnel lining of a cross section perpendicular to a tunnel axis which has the rotational symmetry of an angle of 180°. K-type segments K<SB>1</SB>and K<SB>2</SB>with inclinations, the circumferential jointing surfaces 7 of which are isolated from each other on the side of the direction of tunnel excavation, are provided on two opposed sides of the segment ring, respectively. A male joint 3 of the segment ring is arranged in such a manner as to be rotationally symmetrical at an angle of 180°with respect to the central axis O. COPYRIGHT: (C)2008,JPO&INPIT
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