| 摘要 |
A boom structure for collecting and screening off impurities located on an at the surface of contaminated water. The boom has a curtain of clothlike material depending substantially vertically in the water and supported by buoyant bodies and maintained in a substantially vertical position by weights attached preferably to the lower edge of the curtain. The buoyant bodies comprise hermetically sealed buoyant bags attached to one or both sides of the curtain and constructed of soft cloth material which is impermeable to liquid. The bags when not influenced by water pressure are flat and of substantially uniform thickness. The buoyant bags enclose a constant quantity of gas, preferably air, and are attached to the curtain such that the quantity of gas enclosed in each buoyant bag when subjected to water pressure as the boom is placed in the water can be freely pressed up towards an upper portion of the buoyant bag to create in said portion a balloon-like swelling.
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