Abstract
Recently Tunneling Methods have been greatly developed giving good results. On the one hand, the tunnels in use are suffering from water leakage reportedly at the section longer than a half of the total length. The maintenance work for the leakage requires a great labour and cost expenses because of serious work in the closed narrow space. The reduction of leak itself is expected in the nature of things.
Here are reported the effective tunnel waterproof methods by use of the lately progressed Sheet Waterproof Technology for construction of the reliable tunnel of the extremely less leakage.
