Tunnelling Shield

A tunnelling shield is a protective structure used in the excavation of tunnels through soil that is too soft or fluid to remain stable during the time it takes to line the tunnel with a support structure of concrete, cast iron or steel. In effect, the shield serves as a temporary support structure for the tunnel while it is being excavated.

Read more about Tunnelling ShieldHistory, Manual Shield Tunnelling, Modern Tunnel Boring Machines, Lining, Shields in Japan

Other articles related to "tunnelling, tunnelling shield, shield, shields":

Peter W. Barlow
... of tunnels and the development of tunnelling techniques, namely his patent in 1864 for the cylindrical tunnelling shield used by James Greathead in the construction of his tunnel under the Thames ... This was an improvement upon the original tunnelling shield designed and patented by Marc Isambard Brunel in 1818 ... The shield prevented the newly dug tunnel from collapsing before it could be lined with cast-iron segments ...
Thames Tunnel - History and Development - Construction
... instead) but Brunel continued to develop ideas for new methods of tunnelling ... Brunel and Thomas Cochrane patented the tunnelling shield, a revolutionary advance in tunnelling technology, in January 1818 ... Wapping, which would be dug using his new shield ...
Tunnelling Shield - Shields in Japan
... In Japan there are several innovative approaches to shield tunnelling, e.g ... There are also shields with computerized arms which can be used to dig a tunnel in virtually any shape ...
Marc Isambard Brunel - Thames Tunnel
... In 1818 Brunel had patented a tunnelling shield ... This was a reinforced shield of cast iron in which miners would work in separate compartments, digging at the tunnel-face ... Periodically the shield would be driven forward by large jacks, and the tunnel surface behind it would be covered with cast iron lining rings ...

Famous quotes containing the word shield:

    Vice is its own reward. It is virtue which, if it is to be marketed with consumer appeal, must carry Green Shield stamps.
    Quentin Crisp (b. 1908)