シールドトンネル
1. Tunnelling shieldA 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, cast iron or steel. In effect, the shield serves as a temporary support structure for the tunnel while it is being excavated.
Read “Tunnelling shield” on English Wikipedia
Read “シールドトンネル” on Japanese Wikipedia
Read “Tunnelling shield” on DBpedia
Read “Tunnelling shield” on English Wikipedia
Read “シールドトンネル” on Japanese Wikipedia
Read “Tunnelling shield” on DBpedia
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