Abstract:The drainage system in the central business district (CBD) of Huangpu District, Shanghai, as a typical built-up combined sewer system, is responsible for the drainage function of core areas such as East Nanjing Road Pedestrian Street and the Bund. Aiming at the problems such as low design standards, poor sewage interception efficiency, limited land availability and sensitive surrounding environment of the original combined sewer system, the planning and design concepts, technical schemes, and innovative practices in the upgrading reconstruction project of the drainage pumping station in this district are systematically expounded. Through the technical approaches such as optimization of shield construction, intensive utilization of vertical space and safety control of deep foundation pits in the project, the functional integration of a rainwater pump (26 m3/s) and an initial rainwater storage tank (13 200 m3) is realized within a constrained land area of 2 922 m2. Additionally, the pumping station is innovatively combined with a rooftop garden and community service facilities, forming an important node of the “Expo Belt of Shanghai-style Charm”. Practice demonstrates that the project has upgraded the drainage standard from once a year to once every three years, intercepting 122.73 million cubic meters of initial rainwater and 8.8558 million cubic meters of dry season sewage annually, and reducing COD emissions by 2 656.7 t, which provides a demonstration for the coordinated development of infrastructure upgrading and urban spatial quality improvement in high-density urban core areas.
