The south road extension of Ningbo Airport Road is a project that involves a double-deck viaduct with an expressway and rail integration. According to the requirements for developing precast structures and the demands of environmental protection, refined designs are needed. This study focused on designs for rapid construction, noise reduction, and top evacuation platforms of U-shaped track girders. In view of the refined design method, this investigation introduced key points for a double-deck viaduct with highway and rail integration. By sharing technological innovations of a bridge erection machine, a double precast beam can be built, i.e. the lower deck also uses a precast track beam on a closed-frame pier. This method significantly improves the construction speed of a double-deck viaduct. The measures of noise reduction involve the optimization of a U-shaped track beam structure, setting a noise barrier, and designing expansion joints that decrease vibration and noise. The paper also investigated the position relationship between the platform and the floor of the carriage when the web roof of the U-shaped track beam is used as an evacuation platform.