Patent ID: 8973325
Filing Date: 2015-03-10
Classification: E04D,Y10T

Abstract:
1. A method for roof drainage, the method comprising: a) arranging a drainage device on a roof, the drainage device comprising a drainage exit and a drainage pipe comprising a wall; b) increasing a height of the drainage exit to allow the drainage exit to be between 5 and 10 cm higher than the roof; and c) arranging a water outlet hole having a drainage capacity on the wall of the drainage pipe at a position that has the same height as the roof or is lower than the roof; d) disposing a siphon on an upper part of the drainage pipe, the siphon comprising an inlet and an outlet, allowing the inlet to face the roof, and allowing the outlet to extend into the drainage pipe; and e) disposing a ball cock mechanism on the wall of the drainage pipe to control the water outlet hole to open or close, so that when a water level on the roof reaches a preset height, the water outlet hole is closed by the ball cock mechanism.