FISH PROTECTION STRUCTURE Russian patent published in 2005 - IPC

FIELD: hydraulic structures, particularly to protect young fish against passing into water intake structures.

SUBSTANCE: fish protection structure includes filtering screen vertically installed in guiding means and formed of netted web secured to load-bearing frames. Filtering screen closes intake channel through the full depth thereof. Fish protection structure also has flushing unit made as perforated tube communicated with pump, fish pass arranged at downstream filtering screen end and additional device adapted to draw off garbage and young fish from the structure. The additional device is arranged in front of netted web from intake channel side and is formed as water-impermeable screen. Netted web is provided with additional vertical guiding means locating along its side surface facing water intake channel. Guiding means are formed as two channel bars with flanges secured to load-bearing frame and inner surfaces facing one another. Guiding means of load-bearing structures extend towards intake channel, secured to end parts of bridge piers and made as flange beams. Perforated tube is located under netted web from intake channel side, between netted web and flat water-impermeable screen facing intake channel and secured to side surface of perforated tube along its height. Water-impermeable screen plane is oriented along filtering surface of netted web. Perforated tube perforations are provided with nozzles extending at acute angles to longitudinal axis of perforated tube. Outlet nozzle orifices are directed towards water surface.

EFFECT: increased efficiency of netted web flushing.

19 cl, 29 dwg