Rainwater pipeline reducing and shunting device in groove type connection

The utility model discloses a rainwater pipeline reducing and shunting device connected in a groove mode, and belongs to the technical field of building water supply and drainage. Comprising a rainwater vertical pipe (1), a rainwater transverse pipe (2), a rainwater branch pipe (3), a groove type tee joint (4), a mechanical tee joint (5), a groove type pipe clamp (6), a groove type blind plate (7), a groove type elbow (8), an automatic exhaust valve (9) and an exhaust short pipe (14). And the assembled pipelines and pipe fittings are fixed on the angle steel bracket through the U-shaped hoops, the nuts, the gaskets and the spring pads. The rainwater drainage device has the advantages that air in the transverse pipe of the rainwater pipe can be emptied, resistance to falling rainwater in the vertical pipe caused by air rising is reduced, and rainwater drainage can be accelerated. The support and the U-shaped hoop are used for supporting and fixing the pipeline, the blind plates on the two sides of the transver