What are the design points of Hangzhou aluminum downspout

What are the design points of aluminum alloy water system pipe? There are three main types of downspouts currently used. The category is metal pipe, such as hot-dip galvanized cast iron pipe lined with plastic, steel pipe, stainless steel pipe, etc. The category is plastic composite metal pipe, such as plastic composite steel pipe, aluminum-plastic composite pipe, etc. The third type is plastic pipe, such as PP-R (cross-linked polypropylene high-density mesh engineering plastic).　

　　The downpipe support adopts clamp type support. When installing, the support form and position should be determined according to the design requirements. Before installing the bracket on the brick wall, water should be used to wet the dust in the wall holes, extend the bracket into the reserved hole in the wall, and fill it with cement mortar. Expansion bolts are used to secure supports to concrete slabs, concrete walls, beams, and columns. The size of the wall bracket is determined according to the bracket type and pipe diameter, generally 150~200mm. The support should be de-rusted and coated with anti-rust paint.

　　Aluminum downspouts should be installed expansion joints according to design requirements. If there is no design requirement, the expansion joint should be placed under the tee in accordance with the specification requirements. The risers should be fixed across the floor and the roof openings should be rechecked for fit. The insert end should first mark the insert length, and then force the insert into the mark. When appropriate, it should be fixed to the upper edge of the expansion joint using a U-shaped clamp. Then align and measure whether the distance between the top plate and the tee meets the requirements.

　　The bottom of the outdoor rainwater pipe shall be dispersed or centralized according to the design requirements. If dispersed drainage is used, elbows should be set in the lower outlet, and direct flushing of the ground is not allowed. If centralized drainage is used, the wall casing should be added when passing through the skirt to ensure that the downspout and skirt can expand freely.