基于海绵城市地块内雨水泵站改扩建的设计探讨

Discussion on Design of Rainfall Pumping Station Reconstruction and Extension in Sponge City Plot

在新的暴雨强度公式下现状雨水泵站无法满足现行排涝标准下防洪要求,需要对泵站的规模进行重新核算。在雨水泵站前端内河设置下凹式绿地等海绵城市措施,将大幅度增加地块的调蓄能力,从而削减排涝模数,降低泵站的设计规模,降低改扩建成本。二埠泵站原设计规模为8 m^(3)/s,根据南京市新的暴雨强度公式,该泵站规模应达到16 m^(3)/s,由于安江河周边设置了下凹式绿地,增加了其蓄水量,使得排涝模数降低,经过计算,泵站改扩建规模为10 m^(3)/s,在现状土建不变的情况下更换其中两台轴流泵实现泵站排涝能力的提升。

Under the new rainstorm intensity formula,the current situation of rainfall pumping station cannot meet the flood control requirements of the current waterlogging drainage standards.It is necessary to recheck and recalculate the scale of pumping station.The sponge city measure such as sunken green space will be set up in the inland river in the front end of the rainfall pumping station,which will greatly increase the regulation and storage capacity of the plot so as to reduce the waterlogging drainage modulus and the design scale of pumping station,and also reduce the cost of reconstruction and extension.The original design scale of Erbu Pumping Station is 8 m^(3)/s.According to the new rainstorm intensity formula in Nanjing,the scale of this pumping station should reach 16 m^(3)/s.Due to the sunken green space set up around Anjiang River,its water storage capacity is increased,which reduces the waterlogging drainage modulus.After calculation,the reconstruction and extension scale of the pumping station is 10 m^(3)/s.In the current situation of civil engineering unchanged,the two axial-flow pumps are replaced to improve the waterlogging drainage capacity of the pumping station.