Tunnelling shield
A tunnelling shield is a protective structure used in the excavation of tunnels through soil that is too soft or fluid to remain stable during the time it takes to line the tunnel with a support structure of concrete or steel. In effect, the shield serves as a temporary support structure for the tunnel while it is being excavated.
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~ Table of Content ~
| ► | Introduction |
| ► | History |
| ► | Manual shield tunneling |
| ► | Modern tunnel boring machines |
| ► | Lining |
| ► | Shields in Japan |
| ► | External links |
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