大明宫国家遗址公园:御道广场雨水蓄洪排水系统设计

THE NATIONAL HERITAGE PARK OF DAMING PALACE:DESIGN OF RAIN WATER STORAGE AND DRAINAGE SYSTEM OF EMPEROR'S WAY SQUARE

西安唐大明宫国家遗址公园——御道广场建址于唐大明宫大遗址保护区,属国家重点文物保护区。其地处湿陷性黄土地区,东西向宽度为390m、南北向长度为594m,总面积为23.2万m^2。建筑师要求广场铺装地面全部为零坡度、无排水明沟,这种纯平广场给雨水排水系统设计带来了新的技术课题。如何解决广场表面无坡度排水的困难,采用什么样的设计才能保证广场在重现期暴雨时不积水且快速排放,又以什么方式才能保证超重现期时的雨水蓄洪能力。本文着重探讨御道广场中根据上述特点设计的全透水有组织雨水排水系统的形式及难点解决方式,研究雨水设计流量计算参数的确定和系统实施工艺,以及采取一系列安全保护措施,从而满足了建筑师的要求。

The National Heritage Park of Daming Palace in Xi＇an,the Square of Emperors＇ Way,located in the relics protection zone of the Daming Palace Heritage,which is one of the national prominent cultural heritage protection zone.The zone is in the filed of saturated yielding loess,with the west-east width 390m and north-south length 594m,and total area 232 000m2.The architect requires the zero slope and no exposed draining channel for square pavement,which lays the new technological subject for the design of water rain drainage system.How to resolve the problem of drainage on the ground of the square,what design can ensure rapid drainage and no ponding in return period and what design can ensure the unusual floodwater storage for hyper-return period.The paper discusses the key points and resolution of the permeable rainwater drainage system design in accordance with the specialties mentioned above and studies the determination of the parameters of the rainfall flow and systematical construction technologies,as well as a series of safety measures,which fulfills the requirements of architects.