| 摘要 |
PROBLEM TO BE SOLVED: To provide a segment of a tunnel dispensing with construction of a trough base and a pipe rack and a structure of the tunnel. SOLUTION: The segment 10 is formed of opposite main girders 12 and 12, a vertical rib 13 and a joint plate 14 connected between the main girders 12 and 12. A through hole 120 insertably opening piping is provided in the main girder 12 of the segment 10. An expandable connection pipe 20 constituting a part of the piping is inserted in the through hole 120, and is continuously laid in a tunnel axial direction. COPYRIGHT: (C)2003,JPO
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