Abstract:Taking the Hailuo Island Cross-sea Bridge Project as the background, the situation of the project is introduced. Based on this, the pipeline cross-sea schemes are judged and compared, and the selected scheme is further analyzed and improved. The integrated utility tunnel and bridge cross-sea scheme is finally made and implemented. During the process of the project, facing the unprecedented conditions, the suitable original bridge type is finally created through the repeated research and bold innovation of designers, and the patent authorization is achieved. The scheme is open and inclusive for pipeline layout, and has its unique advantages in the application of pipeline crossing the sea.