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About: Tunnel hole-through     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Whole100003553, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: yago:WikicatTunnelsyago:Artifact100021939yago:Object100002684yago:Passage103895293yago:Passageway103895585yago:PhysicalEntity100001930yago:YagoGeoEntityyago:YagoPermanentlyLocatedEntitysports eventyago:Tunnel104497962yago:Way104564698yago:Whole100003553 New Facet based on Instances of this Class

Tunnel hole-through, also called breakthrough, is the time, during the construction of a tunnel built from both ends, when the ends meet, and the accuracy of the survey work becomes evident. Many tunnels report breakthroughs with an error of only a few inches, for example: * the 1858 Blue Ridge Tunnel – 6 inches (150 mm) * the 1944 Blue Ridge Tunnel replacement – 4 feet (1.2 m) - 1944 * the Lötschberg Base Tunnel – 10 cm * the Holland Tunnel - 1 cm