下凹式立交桥区雨水调蓄池容积计算方法研究

Study on calculation method for the volume of stormwater adjustment tank for the sinking overpass bridge area

为解决下凹式立交桥区的内涝积水问题,雨水调蓄池是其中一项重要措施,但雨水调蓄池容积的合理计算关乎内涝安全和工程投资。为科学合理计算下凹式立交桥区调蓄池的容积,提出了在雨水汇流和排放过程中,考虑雨水系统的雨水口、雨水管道、泵站等不同环节能力约束的雨水调蓄池容积计算方法。为便于实际应用,采用等流时线法代替数值计算过程,并通过逐时段叠加分析,计算得到雨水调蓄池容积。最后结合典型下凹式立交桥实例,描述了该方法的计算过程及结果。

Stormwater adjustment tank is one of key measures to solve the water logging in sinking overpass bridge area.As a result,the precise calculation of its volume would be key for the security of this area and the investment of the project.To calculate the volume of the stormwater adjustment tank for sinking overpass bridge area,this paper proposed the calculation method based on the comprehensive consideration of various restrains in run off,collection and discharge processes of stormwater including rainfall inlet,stormwater pipe,and pump station.For convenient application,this paper used the isochrone method instead of numerical calculation process;the volume of stormwater adjustment tank was figured out by consequent time period overlapping analysis.Finally,the calculation process and result of this method was explained based on a case study of typical sinking overpass bridge.