ABSTRACT
Several methods have been applied to control leakage in tunnels. In urban tunnels in Tokyo, water that flows into tunnels often contains a large amount of salt, causing considerable damage to the equipment within the tunnels. Secondary linings nowadays are usually installed at problem points by large-scale mechanized construction using precast concrete wall (PCW) panels. The measure, however, is still rather costly. In order to reduce leakage controlling cost in the future, an effective method for installing secondary lining has been developed. This paper provides the details of the method.
