Abstract:The primary rainwater pollution control project at the middle reaches of the South Feihe River was built at both sides of the South Feihe River in Hefei City. This project starts from Binhe Road-Heping Road Intersection at the north to Binshui Park at the south. A 22.5-m deep large rainwater pumping station was built at Binshui Park (South Chaohu Road-Tongling Road Intersection). This project was excavated and constructed by using the cast-in-place piles combined with steel five-support supporting system. The structure of this pumping station has no medium plate. The original support demolition scheme adopts the "closed demolition method" for construction. In other words, the structures of pumping station will be dismantled after all completed. in the construction process, the rebar of side wall should pass through the steel support members. The construction situation is complex, which will cause the hidden danger to the waterproof of structure and the pouring quality of concrete. After the study, discussion and theoretical calculation, the support demolition scheme is optimized to use the existing waist beam and structural middle partition for support replacement. This method greatly shortens the construction period, and guarantees the construction quality of the main structure, which can be referenced for the other similar projects.
