城市综合管廊真空排水系统模型试验及设计技术研究

Research on Model Test and Design Technology about the Vacuum Drainage System of Utility Tunnel

针对目前地下综合管廊常规排水方式由于集水坑内长期无水,潜水泵长期不运行而导致其故障率高、使用寿命降低的问题,研究采用真空排水方式解决常规低点设置集水坑和潜水泵排水方式存在的问题,从而降低整个排水系统的工程投资,减少潜水泵后期检修维护工作量,大大提高管廊内排水系统的可靠性。通过建立地下综合管廊真空排水系统试验模型,模拟不同条件下真空排水系统运行工况,得出综合管廊真空排水系统的适用条件(包括系统最大高差、高差允许范围内的最大服务距离、集水能力或最大排水量、排水水质等)和相关设计要点(包括真空管路、真空泵站和真空收集箱等),以及系统最优设计参数(包括真空管路、真空泵站和真空收集箱等)。

Due to the long-term lack of water in the sump,the conventional drainage mode of utility tunnel causes the long-term non-operation of the submersible pump,which leads to the high failure rate and short service life of the submersible pump. The vacuum drainage mode of utility tunnel was applied to solve the problems existing in the conventional drainage mode, which can reduce the engineering investment of the whole drainage system and the later maintenance work,and improve the reliability of drainage system in utility tunnel. The vacuum drainage system test model was established,and the operation conditions of the vacuum drainage system under different conditions were simulated.The applicable conditions( including the maximum elevation difference of the system,the maximum service distance within the allowable range of the elevation difference, the catchment capacity or maximum discharge,and the drainage quality) and relevant design points( including vacuum pipeline design,vacuum pump station design and vacuum collection tank design),and the optimal design parameters( including vacuum pipeline,vacuum pump station and vacuum collection tank) of the vacuum drainage system of utility tunnel were obtained.