海绵城市高架立体式排水系统研究分析

Research and Analysis on Three-Dimensional Drainage System of Elevated Roads in Sponge Cities

摘要:

随着“海绵城市”概念不断推广，对城市雨水的收集利用提出了更高的要求，与之对应的高架排水系统在设计、施工方面也不断改革创新。从龙东大道改建工程1标排水系统组成入手，以介绍海绵城市高架立体式排水系统为目的，采用将排水系统拆解为不同部位，并分析各部位组成及其排水原理的方法，研究雨水在系统中的渗、导、蓄、排过程，得出以下结论：高架立体式排水系统由上、中、下、地下四部分组成，自上而下完成雨水的收集和排放；大孔隙开级配排水式沥青磨耗层OGFC（open-graded friction course）依靠其高空隙率使雨水快速下渗，防止路面水漂现象的产生；悬吊管决定系统中部泄水能力，且最大流量发生在非满流状态；地面雨水花园可对雨水进行收集、调蓄和过滤，并能够打造成特色绿化景观带，让市民打卡观赏。

Abstract:

With the continuous promotion of the "Sponge City" concept, the higher requirements have been put forward for the collection and utilization of urban rainwater. Correspondingly, the design and construction of drainage systems in the elevated roads have been also continuously reformed and innovated. Starting from the composition of the drainage system in Section 1 of the Longdong Avenue Reconstruction Project, aiming to introduce the three-dimensional drainage system for elevated roads in Sponge City, the drainage system is broken down into different components, and the composition and drainage principles of each part are analyzed to study the process of infiltration, conduction, storage and discharge of rainwater in the system. The following conclusions show that the three-dimensional drainage system for elevated roads consists of four parts, upper, middle, lower and underground to complete the collection and discharge of rainwater from top to bottom. The large-pore open-graded friction course (OGFC) relies on its high porosity to make the rainwater rapid infiltration, preventing hydroplaning on the pavements. The suspended pipe determines the drainage capacity of the middle part of the system, and the maximum flow occurs under non-full flow conditions. And the ground-level rainwater garden can collect, regulate, store and filter the rainwater, and be developed into a distinctive green landscape belt for public appreciation and visitation.