| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure of a segment reducing the number of pieces into which the segment is divided, and reducing the number of joints of the segment to provide excellent construction and working properties. SOLUTION: The segment is used for constructing a lining on the inner periphery of a tunnel. Hinges 2 are attached between a plurality of segments 1a and 1b and to the sides of the segments facing the inner periphery of the tunnel, so that the segments are foldable.
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