Tunnel hole-through
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Tunnel hole-through, also called breakthrough, is the time, during the construction of a tunnel built from both ends, when the ends meet,[1] 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 – Template:Convert
- the 1944 Blue Ridge Tunnel replacement – Template:Convert - 1944
- the Lötschberg Base Tunnel – 10 cm[2]
- the Holland Tunnel - 1 cm[3]
See also
References
External links
- Template:Flagicon Gautrain tunnel breakthrough
- Template:Flagicon Brisbane Clem 7
- Template:Flagicon Gotthard tunnel
- Template:Flagicon Lotschberg - 10 cm
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- ↑ Lotschberg
- ↑ Script error: No such module "citation/CS1".