| Development of a Building Method of a Large Tunnel by Integrated Small Shields |
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| - Harmonica Method - |
| Masaki YUGUCHI, Eturou USHIODA, Kenichi KANEKO, Kenrou UEDA and Yutaka OOHATA |
We are developing a new technique of building a large tunnel by piling up small shield tunnels, as a way of making underpasses at the intersection between a railway and a roadway, or between two roadways.
A tunnel is divided into several sections as if mouthpiece of a harmonica and each section is built individually, and then they are connected together. The miniaturization of machines makes it possible to build a tunnel which is shallow ground. Moreover, during the execution it does not significantly damages the ground, because of its cross-sectional structure. Since they are built partly, it eases traffic congestion. It is also suitable for a long distance or a curve-lined section. |
| keywords: |
Underpass, Shield Driving Method, Traffic Jam, Interchange, Harmonica |