| 摘要 |
PROBLEM TO BE SOLVED: To provide a navigation gate capable of suppressing facility costs low.SOLUTION: There is provided a navigation gate 11 that is provided to a fence 1 for preventing muddy water and oil from being diffused and permits a ship 35 to pass through the fence 1. The fence 1 includes floats 3 and 13 and fence bodies 7 and 17 fitted to be hung from lower parts of the floats 3 and 13. The floats 3 and 13 are provided partly with a navigation part 22 which is lower at one step than other parts, and the navigation part 22 is pressed down with the weight of the ship 35, so that the ship 35 can sail over the navigation part 22. |
