贵州都匀市河谷型城市截污干管改造设计

在贵州省黔南州都匀市剑江河截污系统改造工程的总体方案设计中,充分结合上位排水规划,以截污系统性能为目标,统筹考虑景观效果,最大程度保护当地原有历史风貌。管道设计计算突破常规计算方法,与水利工程结合,将洪水位纳入水力计算边界条件,采用短管淹没出流公式进行计算。采用人工格栅井、紧凑型机械格栅截流井对接入污水进行前处理,部分特殊排口采用创新性的异型截(溢)流设施,实现污水截流、垃圾清除、超量合流雨污水溢流的功能。工程的成功实施可为类似的河谷型城市沿河截污干管改造工程提供实践经验。

Design of Main Sewage Intercept Pipe Reconstruction in Valley City in Duyun,Guizhou Province

The reconstruction project of main sewage intercept pipe of Jianjiang River, Duyun City, Guizhou Province was introduced. In the overall plan, the upper drainage planning was fully considered , the performance of the sewage interception system was taken as the goal, and the landscape effect was determined as the premise, to protect the original historical features to the greatest extent. In the piping design process, the ordinary calculation method was broken through. Combined with water conservancy project, the flood water level was brought into the boundary condition of hydraulic calculation, and the formula of inundation and outflow of short pipe was used to calculate the water level. Artificial grille wells and compact intercepting wells with mechanical grillers were applied in the pretreatment of wastewater. Special shaped intercepting/overflow wells were applied in several types of special outfalls with innovative design. These structures had the functions of water interception, trash removal and overflowing combined rain sewage overflow. The project may provide direction and experience for similar projects of main sewage intercept pipe reconstruction of valley cities.