| 摘要 |
PROBLEM TO BE SOLVED: To provide a pollution prevention device used in dredging work that inhibits leaking of turbulent sediment outside of a dredging water area, when dredging not only a central part of the dredging water area but also a location near an air curtain, and enabling sediment scattered all over the dredging water area to be gathered and scooped at one location.SOLUTION: A pollution prevention device includes: air bubble ejection means installed at a water bottom near a boundary of a dredging water area, ejecting air bubbles toward inside of the dredging water area, for forming a tubular air curtain underwater along the boundary of the dredging water area; and an annular inclined guide member installed near a water surface at the boundary of the dredging water area, being inclined more inwardly toward the top. By forming the air curtain using the air bubble ejection means, an upward water flow is generated at an outer peripheral part of the dredging water area. When the water flow reaches the water surface, the inclined guide member sequentially leads the water flow inwardly into the dredging water area.SELECTED DRAWING: Figure 1 |
