| 摘要 |
PROBLEM TO BE SOLVED: To provide a traveling centre capable of lining immediately after excavation by allowing the passage of vehicles inside the traveling centre. SOLUTION: This traveling centre 4 is provided with a form 5 opposed with a clearance to a pit wall surface 2 built up in cylindrical shape extending in the axial direction of a pit 1; frames 6 arranged in the form 5 to support the form 5; and support parts 7 provided at both ends of the frames 6 projected from both ends of the form 5, to support the frames 6. The frame 6 is formed in a hollow shape, and a landing bridge extending in the axial direction of the pit 1 and allowing vehicles to pass through is inserted through the frame 6. One end of the landing bridge 8 communicates with the inside of the pit 1 in front of the frame 6, and the other end of the landing bridge 8 communicates with the inside of the pit 1 behind the frame 6. The landing bridge 8 is supported by first support posts 34 travelable in the pit 1. COPYRIGHT: (C)2005,JPO&NCIPI
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