[Example of Surface Water Works] Sado Circular Route, Taka Tunnel at Hage

Introducing a case where the installation of gutters in areas without leaks was minimized, while clarifying the drainage route and achieving effective water diversion measures!

This is an example of a tunnel leakage prevention construction project using "surface drainage" at the Taka Tunnel in the Sado Loop Line, located in Sado City, Niigata Prefecture. There were numerous cracks over a wide area at the top of the tunnel, leading to leakage. On the other hand, there was a request not to install drainage pipes in areas without leakage other than the top, necessitating efficient drainage measures. By installing a funnel-shaped catch basin between the side drain and the arch drain line, we were able to prevent water from pooling in the side drain, thereby improving drainage performance and reducing maintenance burdens. 【Case Summary】 ■Challenges - Numerous cracks over a wide area at the top of the tunnel were causing leakage. - There was a request not to install drainage pipes in areas without leakage other than the top, requiring efficient drainage measures. ■Results - We were able to improve drainage performance and reduce maintenance burdens. *For more details, please download the PDF or feel free to contact us.

Renovation and repair methods