| 摘要 |
PROBLEM TO BE SOLVED: To provide a lining wall for the mine mouth part of a tunnel with end faces positioned by deviating onto an innermost side and a front side on the left and right sides when viewed from a vehicle entering the tunnel and enabling a driver to drive the vehicle stably and continuously when entering the tunnel by the vehicle. SOLUTION: On the lining wall 3 for the mine mouth part 2 of the tunnel 1 on which end faces 3a are positioned by deviating onto the innermost side and the front side on the left and right sides when viewed from the vehicle c entering the tunnel 1, width t1 of an end face part 3a1 on the innermost side is set to be large when compared with width t2 of an end face part 3a2 on the front side. The driver d entering the tunnel 1 by the vehicle c can confirm visually that the end face part 3a1 on the innermost side and the end face part 3a2 on the front side of the lining wall 3 have substantially same size by balancing a difference in distance 11, 12 from the driver d and a difference in width t1, t2. Consequently, the driver d can continue driving stably. COPYRIGHT: (C)2004,JPO
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