Bridgestone Corporation

Hideaki Saito

Tateo Muramatsu

Yasushi Enami

Mamoru Takasaki

Kuninori Aramaki

A flexible sheet dam is secured to the riverbed along two securing lines at upstream and downstream sides. In this dam, at least one concave and/or convex region is made in the plane of the riverbed between the two securing lines in a direction parallel to the securing lines, whereby the complete deflation of the dam can be attained without trouble.

Flexible sheet dams

A flexible membraneous weir is disclosed. When air once filled in an air type flexible membrane weir is discharged in order to cause it to collapse, its membraneous wall is deformed in a V-shape at one portion in the river width direction, and a stream concentrates into this portion. However, the portion where the V-deformation will be formed is not certain. Therefore, it is required to reinforce the whole area of the river-bed and the river wall at the down stream side. In view of the foregoing, means is provided for starting V-deformation onto a bag-shaped member as a main body of the weir in a predetermined portion at a time when the bag-shaped member is collapse from its erected state. With this arrangement, the stream can be concentrated on the predetermined portion only. Therefore reinforcement is required only for a river-bed portion corresponding to this portion.

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Chigasaki, Japan

Hideaki Saito