Abstract: There is provided an internal pressure regulating system in which when a flexible bag body used for a collapsible dam is excessively pressurized, gas within the bag body is discharged. The system includes a flexible bag body which can be inflated with gas, and a pipe having opposite ends, with one end connected to an exhaust opening in the bag body, and the other end introduced into the upstream region of a watercourse.

Abstract: There is provided an internal pressure regulating system in which when a flexible bag body used for a collapsible dam is excessively pressurized, gas within the bag body is discharged. The system includes a flexible bag body which can be inflated with gas, and a pipe having opposite ends, with one end connected to an exhaust opening in the bag body, and the other end introduced into the upstream region of a watercourse.

Abstract: A flexible membrane inflating structural body is fixed to a structure such as a bed and slope sides of a waterway by using a mounting metal fitting comprising a first metal fitting and a second metal fitting. The flexible membrane inflating structural body is erected by supplying a fluid to an interior of a flexible membrane, and is deflated by discharging the fluid within the flexible membrane. The first metal fitting is disposed at a side of the structure at which the flexible membrane inflating structural body is provided and contacts one surface of the flexible membrane. The second metal fitting contacts another surface of the flexible membrane and, together with the first metal fitting, sandwiches a portion of the flexible membrane in a vicinity of an outer peripheral edge of the flexible membrane. The first and second metal fittings, which form the mounting metal fitting, each include at least one convex portion which bends the flexible membrane while the flexible membrane is in a held state.

Abstract: A collapsible sheet dam comprises a bag of flexible rubber sheet fixed onto a riverbed and riverbank portions of a river, and a fluid supply and discharge port formed in the bag. In such a dam, an end portion of the bag is fixed onto the riverbed and riverbank portions at upstream side and at the same time a portion of the bag located behind the fluid supply and discharge port is fixed onto the riverbank portion and a region ranging from the riverbank portion to the riverbed portion around the fluid supply and discharge port.

Abstract: A marine fender comprising a hollow tapered body of an elastic material, either small-diameter side or large-diameter side of which being a shock-receiving side and the other being a fastening side is disclosed. In this marine fender, the thickness of the hollow tapered body is gradually thickened from the large-diameter side toward the small-diameter side, and the hollow tapered body is provided at the outer periphery with a groove formed at a given position near the shock-receiving side end, and has a truncated pyramidal form at either the inner surface or the outer surface or both surfaces thereof.