Abstract: China’s water resources are poor and unevenly distributed. In order to meet the needs of economic development in various regions and the people’s needs for improving the living environment,various water diversion and transfer projects have increased year by year. Cast-in-situ reinforced concrete box culvert is a widely used form of water conveyance in this type of projects. This paper analyzes the problems existing in the control building （connecting well） of the traditional perforated box culvert. Taking the design of the connecting well of Duliujian River inverted siphon project as an example,citing the concept of three-dimensional traffic,a new type of connecting well design is introduced.

Key words: Duliujian River inverted siphon project, multi-pore box culvert control building （connecting well）, double layer, three-dimensional shunt