The technical advantages of roof rainwater to undertake rainfall pressure flow roof rainwater drainage system in the slope along the roof together into the gutter, traditional drainage gutter is gathered in the rain through the rain, rain water pipe, the discharge tube row to the rainwater inspection wells, or through the rain bucket, pipe, pipe, rain the discharge tube row to the manholes.
The general roof drainage system used to set the position and the drainage pipe is divided into external and internal drainage system and drainage system, from the point of view of hydraulics can be divided into gravity flow drainage and pressure flow roof roof drainage system two, the latter is emphasized in the design of roof drainage system under the condition of rainfall intensity of pressure.
Based on the analysis of the flow state of different roof rainwater drainage systems, different design methods are adopted. Roof rainwater drainage system is designed according to the traditional flow of gravity, gravity roof drainage system with gravity type rain bucket, bucket rain drainage is free weir flow into the rain bucket into the air, forming a mixture of water and rainwater flow, design flow of the small bucket; according to the gravity calculation of the flow pipe should not exceed 0.8 the filling degree and more than 5% of the slope, it needs great diameter and gradient, in order to ensure the connection in the same pipe on the rain bucket work, defines the connection of rain bucket is not more than 4, resulting in the standpipe increase root number. Gravity flow roof rainwater drainage system by the hydraulic characteristics of the restrictions, caused by a vertical drainage pipe, large diameter, small drainage capacity, in the area of industrial buildings and public buildings roof rainwater drainage system is more prominent.
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