屋面雨水与地面雨水高低分流蓄排设计方法  

Design Methodology for High-Low Shunt Storage and Drainage of Roof and Pavement Rainwater

作　　者：刘云帆 LIU Yun‑fan(China Urban Construction Design&Research Institute Co.Ltd.,Beijing 100120,China)

机构地区：[1]中国城市建设研究院有限公司,北京100120

出　　处：《中国给水排水》2025年第6期57-63,共7页China Water & Wastewater

摘　　要：针对现有排水管道设计重现期不足的问题,提出屋面与地面雨水高低分流蓄排的设计方法,利用屋面雨水自带的高度势能,建设独立的小管径、浅埋深、无动力的压力排水系统,尤其对于建筑密度较大的老旧城区,能够有效削减既有管网的峰值流量,降低施工成本和难度,大幅提高排水系统的整体重现期。在降低内涝风险的同时,也为充分利用屋面优质雨水资源创造条件。采用FLUENT模型,模拟不同重现期降雨对应的系统运行情况,分析工况特点并给出设计边界条件。In order to solve the problem of insufficient design return period of existing municipal drainage pipelines,this paper presented a design method for the high-low shunt storage and drainage of rainwater from rooftops and pavements.By leveraging the high potential energy of roof rainwater,an independent pressure drainage system was constructed,characterized by small pipe diameter,shallow burial depth,and no reliance on external power sources.Particularly in densely built‑up old urban areas,this system could effectively mitigate peak flows within existing pipe networks,reduce construction cost and complexity,and significantly enhance the overall return period of the drainage system.In addition to mitigating the risk of waterlogging,this approach also established favorable conditions for the optimal utilization of high‑quality rainwater resources from rooftops.FLUENT was employed to simulate the system’s operation under rainfall conditions corresponding to various return periods,analyze the operational characteristics of these scenarios,and establish the design boundary conditions.

关 键 词：屋面雨水 高低分流 蓄排 FLUENT软件 

分 类 号：TU992[建筑科学—市政工程]