Cylindrical Shape Cantilever Earth Retaining Structure
- Design
Cylindrical shape cantilever earth retaining structure employed for a large plane of over 100 meters
The Shin-Toyosu substation is an underground facility designed to house substation equipment. To construct the substation, a cylindrical shape cantilever earth retaining structure was used for a large-scale excavation with a 144 m diameter and 29.2 m depth. As this was the first case of this method being used for a plane over 100 m, we conducted a behavior analysis method to study its performance under equal lateral pressure loading and thermal loading. The study also included an analytical review and evaluation of the actual behavior of the structure.
Reduction of costs and construction period by using a cylindrical shape cantilever earth retaining structure
A cylindrical shape cantilever earth retaining structure is capable of turning earth pressure, water pressure, and other pressure into circumferential compressive axial forces applied to the retaining structure wall concrete, enabling deep, large underground excavation work without the use of auxiliary structures such as struts and ground anchors. By using this method, the original plan, which was rectangular in shape, could be changed to a cylindrical shape, resulting in reduced costs and construction period.
