| 摘要 |
PROBLEM TO BE SOLVED: To inexpensively provide a water tank capable of surely recovering sewage by a simple structure. SOLUTION: This water tank 100 is disposed under the inner wall surface of a tunnel along the longitudinal direction of the tunnel, and recovers the sewage produced when the inner wall surface of the tunnel is washed. The water tank 100 comprises a box having a pair of front and rear side-wall parts 10, a pair of right and left side-wall parts 20, and a bottom part 30. One side-wall part 21 of the pair of right and left side-wall parts 20 is tilted outward. The one side-wall part 21 is hung on the lower part (including the side surface of a bywall) of the inner wall of the tunnel. Consequently, the lower end of the one side-wall part 21 is raised from a ground, and the upper end of the one side-wall part 21 is fitted closely to the lower part of the inner wall surface of the tunnel using the lower end of the other side-wall part 22 as a fulcrum. COPYRIGHT: (C)2009,JPO&INPIT
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