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压力流屋面雨水排水系统的技术特点

压力流屋面雨水排水系统的技术优势降雨过程中屋面承接的雨水沿屋面坡向汇集到天沟,传统的雨水排放是将天沟中汇集的雨水通过雨水斗、雨水立管、排出管排至雨水检查井,或是通过雨水斗、悬吊管、雨水立管、排出管排至雨水检查井。

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.

一般屋面排水系统常按其排水管的设置位置和排水去向分为外排水系统和内排水系统,从水力学的观点来分可分为重力流屋面排水和压力流屋面排水系统两类,后者在于强调在设计降雨强度下屋面排水系统内的有压状况。

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.

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不同的屋面雨水排水系统根据其所具有的水流状态的分析,采用不同的设计计算方法。传统的屋面雨水排水系统按重力流设计,屋面重力式排水系统采用重力式的雨水斗,雨水斗排水状况是自由堰流,流入雨水斗的雨水渗入空气,形成水气混合流,雨水斗的设计流量偏小;按重力流计算的悬吊管要求不大于0.8的充满度和大于5‰的坡度,因此需要较大的管径和坡降,为保证连接在同一悬吊管上的各个雨水斗正常工作,限定连接雨水斗不多于4个,导致雨水立管的根数增加。重力流屋面雨水排水系统受其水力特性的限制,造成排水立管多,管径大,排水能力小,对于大面积工业厂房及公共建筑屋面雨水排水系统则更显突出。

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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