| 摘要 |
PROBLEM TO BE SOLVED: To provide a feeding device for a working truck in tunnel which uses a long extension wire to reduce the frequency of extension work to thereby enable shortening of construction period. SOLUTION: The working truck in tunnel comprises a leading tunnel excavator 10, following trucks 111, 112, 113 and 114 connected thereto, and a man load vehicle 13 traveling within the following trucks. The following trucks advance as a tunnel is excavated, and the man load vehicle transports personnel and materials to a working face. The man load vehicle receives electric power from a main wire 15 via a current collector 16. As the excavation progresses and once the man load vehicle enters an area without the main wire laid therein, the man load vehicle receives electric power from an auxiliary wire 34 via an auxiliary current collector 35.
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