Tunnel hole-through

The topic of this article may not meet Wikipedia's general notability guideline. Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be merged, redirected, or deleted. Find sources:  –  ·  ·  · scholar · JSTOR (May 2014) (Learn how and when to remove this template message)

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[]

• Cascade Tunnel

References[]

External links[]

• Gautrain tunnel breakthrough
• Brisbane Clem 7
• Gotthard tunnel
• Lotschberg - 10 cm

This rail-transport related article is a stub. You can help Wikipedia by .

• v
• t