tunnel borer

tunnel borer

[′tən·əl ‚bȯr·ər]
(mechanical engineering)
Any boring machine for making a tunnel; often a ram armed with cutting faces operated by compressed air.
References in periodicals archive ?
Depending on the type of soil and equipment configuration, the tunnel borer advances between 13 and 20 feet each day, digging tunnels ranging from 6.
The following day, the tunnel borer builds on the work of the day before.
6% of the import volume of complete machinery; and tunnel borer 270 million USD, up by 34% over the last year.
The drilling will use massive tunnel borers, as shown by a video posted on Twitter by Dubai's Roads and Transport Authority on Tuesday.