|発明の名称||FLOATING DUST INFLOW PREVENTIVE DEVICE|
PROBLEM TO BE SOLVED: To reduce cost of a device; to reduce maintenance management work; and to preserve the water feeding function in a flood.
SOLUTION: This floating dust inflow preventive device 2 is arranged in an intake 4 faced by retreating from a flowing water passage 3. A column part 7 is erectly installed in an upstream side water bottom part 4G of the intake 4. A guide sleeve 12 is vertically movably and rotatably installed in this column part 7. A float part 9 is installed in a lower part of the guide sleeve 12. A shielding plate 13 formed in a dimension longer than an intake width is installed in the float part 9. The float part 9 can expose an upper part 13A of the shielding plate 13 on a water surface. An energizing mechanism 20 opens a downstream side end part 13C of the shielding plate 13 to the flowing water passage 3 side against flowing water pressure by plate springs 23A to 23C, and closes the shielding plate 13 to the flowing water passage when energizing force is beaten against a push when the flowing water pressure increases.
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