Abstract
The Japanese construction industry has a great deal to offer regarding designs, methods, and procedures that can efficiently overcome the tough physical and environmental constraints encountered when tunneling in dense urban areas. This is particularly true regarding softground tunneling. The following issues are explored: the use of pre-cast concrete liners, slurry-shield tunneling, earth pressure balance shield tunneling, and non-disruptive cut-and-cover tunneling. All have been used successfully by Japanese design-construction firms. In addition, a diagram illustrates an unusual underwater tube tunnel project undertaken in the Port of Tokyo.
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