TUNNEL TYPE AIR DUCT FOR WATER TREATMENT FACILITIES

摘要

The present invention relates to an air duct that is installed in a granular material (99)-charged treatment tank such as a filtering tank and an artificial wetland in a water treatment facility such as a waste water treatment facility and a non-point pollution treatment facility. The air duct is produced by connecting a curved plate (20) having air holes (21) penetrating therethrough with a semi-circular cross-sectional unit pipe body (10) coupled to a flat plate (30). Coupling projection parts (40) formed on both ends of the flat plate (30) are coupled to coupling holes (23) formed in both ends of the curved plate (20) so that the curved plate (20) and flat plate (30) are coupled. A coupling plate (50) is coupled to the top end of the coupling projection part so that the curved plate (20) and flat plate (30) are closely and strongly coupled. Moreover, a steering connection pipe (60) is installed by coupling a pair of arc-shaped pipes to a part in which the unit pipe bodies (10) are connected, so that a connection angle between the unit pipe bodies (10) can be freely adjusted. Accordingly, lines on the flat surface of the air duct can be variously formed in contrast to existing linear, lean-to-one-side air ducts.