| 摘要 |
PROBLEM TO BE SOLVED: To provide an extensible flash board adjustable for a water way breadth by improving conventional standardization due to water way breadth enlargement and removing uselessness of excessive production of the flash boards. SOLUTION: Regarding a flash board provided with an extensible constitution in order to enable installation in different positions of a door ditch interval as a water cut off device for a water way, by bolt-connection to make the adjacent right and left flash boards 11, 12 movable along the guide rail, the width of the flash board is adapted steplessly to the door ditch interval and the guide rail 25 is inserted in one side of flash board members to increase the frictional resistance of the bolt connection section. COPYRIGHT: (C)2004,JPO
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