SCREEN FOR PROTECTION OF WATER MEDIUM FROM CONTAMINATION WITH GROUND IN UNDERWATER GROUND EXCAVATION JOBS Russian patent published in 1995 - IPC

FIELD: hydraulic engineering. SUBSTANCE: screen includes two crafts - pontoons with guides. Installed between pontoons on guides are three meshed nets of polymer material, reinforced with steel wire ropes. Upper part of nets has floats, and lower part has ballast weights fastened by fastening means. Anchors are installed in lower corners of nets. Nets are installed on guides for sliding to change distance between them. Nets are separated from one another by partitions. Optimal distance between nets with due consideration of flow velocity and nature of bottom rocks amounts to 1-1.5 m. Net meshes are of different geometric sizes, and number of nets in structure may be from two to four. EFFECT: higher efficiency. 5 cl, 2 dwg