| 摘要 |
PROBLEM TO BE SOLVED: To provide a bridge also served as a tide gate which neither is subject to a restriction in the height from a water surface to a road nor needs an excessive strength. SOLUTION: A fixed running structure 7 is erected between bridge piers 5, 5 which are adjacent in a span direction. A movable running structure 11 having a multipurpose-road floor slab 34 is freely liftably provided under the fixed running structure 7 via a lifting guide mechanism 41. The fixed running structure 7 is provided with a movable body lifting device 13 to drive the movable running structure 11 up and down between an upper position for use as the road and a lower position for use as the gate. The multipurpose-road floor slab 34 is structured to be a flap gate which is held by the movable running structure 11 to freely rotate around a horizontal shaft center in a span direction at the downstream end of the flap gate, and the slab 34 has a buoyancy for making the other end protrude from the water surface at the position for use as the gate. COPYRIGHT: (C)2005,JPO&NCIPI |
