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 – 6 inches (150 mm)
the 1944 Blue Ridge Tunnel replacement – 4 feet (1.2 m) - 1944
the Lötschberg Base Tunnel – 10 cm^[2]
the Holland Tunnel - 1 cm^[3]

Dismantling the tunnel boring machine 10 days after the hole-through on the Gotthard Base Tunnel in Switzerland.

See also

Cascade Tunnel

References

^ "Governor Rockefeller and Mayor Lindsay Attend 'Holing Through' of 63d St. Tunnel". The New York Times. October 11, 1972. Retrieved January 24, 2017.
^ Lotschberg
^ "ASCE Metropolitan Section - Holland Tunnel". www.ascemetsection.org. Retrieved 2020-11-21.

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