Dismantling the tunnel boring machine 10 days after the hole-through on the Gotthard Base Tunnel in Switzerland.
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]
See also
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.
External links
.svg.png.webp){kind=small}
.svg.png.webp){kind=small}
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.