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 ?
Earthmovers: The TakrafBaggar - a goliath of an excavator; Enormous earthworm - the Crossrail Tunnel Borer; The supercomputer mega-digger - the Komatsu WA 1200; The CAT 8750 - a walking mega-mover - and its smaller, but just as impressive, cousin the CAT 797F - the world's biggest dumper truck.
Depending on the type of soil and equipment configuration, the tunnel borer advances between 13 and 20 feet each day, digging tunnels ranging from 6.5 to 11.5 feet in diameter.
In this field (from six to 12 feet), DLE has developed an original technology for which it has designed and built a special machine: the "concreting tunnel borer." Ready-mixed concrete is used daily to build the final structure.
The drilling will use massive tunnel borers, as shown by a video posted on Twitter by Dubai's Roads and Transport Authority on Tuesday.