RAINWATER SYSTEM Russian patent published in 2011 - IPC E04D13/04 

FIELD: construction.

SUBSTANCE: rainwater system comprises a drainage pipe arranged at a descending angle to a horizontal line, connected with its one end to a rainwater pipe funnel, and with its other end - to a sewage pipe. The drainage pipe is divided into three sections, the first one adjoins the sewage pipe, the second one - the rainwater pipe funnel, and the third one is flexible and connects the first and the second sections. There is a lock provided at the joint of the second and third sections. The inner surface of the second section, as well as inner surfaces of the rainwater pipe funnel and the rainwater pipe itself are coated with an anti-icing composition.

EFFECT: increased operational reliability of the system.

4 cl, 1 dwg