| 摘要 |
PROBLEM TO BE SOLVED: To prevent the lift of a tunnel by the own weight of segments while suppressing an increase in the manufacturing cost of the segments for the tunnel. SOLUTION: The segment for the tunnel is provided with a metal segment body 3 formed with a recessed part A opened in the thickness direction of the segment along the circumferential direction of the tunnel, and a heavy load 4 heavier than filling weight in the case of filling concrete is filled in the recessed part. COPYRIGHT: (C)2005,JPO&NCIPI
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