Tunnel boring machine
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A tunnel boring machine, also known as a "mole", is a machine used to excavate tunnels. TBMs are an alternative to drilling and blasting methods and "hand mining", allowing more rapid excavation throu
One of the boring machines used for the Channel Tunnel between France and the United Kingdom
Cutting shield used for the New Elbe Tunnel
Looking towards the cutting shield at the hydraulic jacks
A tunnel boring machine cutter head being lowered underground for the construction of the City & Southwest line of the Sydney Metro
Tunnelling shield
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A tunnelling shield is a protective structure used during the excavation of large, human-made tunnels. When excavating through ground that is soft, liquid, or otherwise unstable, there is a potential
Tunnel boring machine
…excavating through rock can, in the 21st century, reach over 700 meters per week, while soil tunneling machines can exceed 200 meters per week. The first successful tunnelling shield was developed by Sir Marc Isambard Brunel to excavate the Thames Tunnel in 1825. However, this was only the invention of the shield concept and did not…
The tunnelling shield used for the construction of the Xinyi Line on the Taipei Metro system in Taiwan.
The Greathead tunnelling shield in use on the Waterloo & City Railway
Tunnel boring machine case left in the completed tunnel and used as part of the support structure at Setagaya-Daita Station on the Odakyu Odawara Line
Tunnel boring machine to excavate a Double-O-Tube