Here's how the tunnel boring machine, or TBM, works: As the 200-ton TBM moves forward, a round cutter head studded with titanium teeth grinds into the tunnel face and splits large chunks off the rock.

Tunnel boring machines (TBMs) are very picky about the rocks they chew through. This is why geologists must monitor the rock at the head of every tunnel. On good days, TBMs can bore through rock ...

As engineers at CRCHI looked to build the world’s largest TBM, they dug back into their ancient roots to overcome a major ...

They consist of a rotating cutting wheel fitted to a series of thrusting mechanisms and conveyors used to advance the machine forward. They can also be referred to as a mole. Tunnel boring machines ...

The annexed engraving is a perspective view of an improved machine for mortising and boring the hubs of wheels, &c. The inventor is N. C. Travis, of Canistota, Madison Co., N. Y., who has taken ...

A mere 400 meters (1,310 feet) long but vastly more powerful are four 10-meter (33-foot) diameter Tunnel Boring Machines—TBMs in tunneling parlance. In a typical day each of these 2,700-ton ...

Tunnelling problems are plaguing the $12 billion Snowy 2.0 hydropower project, with a boring machine previously bogged in ...

There are many types of boring machines. A line boring machine bores holes in heavy construction equipment, such as cranes and endloaders, and is a very economical piece of equipment. A tunnel boring ...

Chennai: Kolli, a tunnel boring machine, built a 903m long tunnel for operation of driverless metro trains in the last one year between Aynavaram and Otteri, and reached its destination at Otteri ...

The annexed engraving is a perspective view of a machine for cutting paper, pasteboard, c, for which a patent was granted on I the 19th of last July (1853) to H. J. Oerter, ? of Bethlehem ...

After a succession of delays and dramas, Snowy Hydro has been forced to acquire an additional tunnel boring machine to make sure the $12 billion Snowy 2.0 pumped hydro project is completed on time.

It has not been without its ­setbacks. The widely publicised ­issues with Florence, one of our three tunnel-boring machines, have required flexibility. We have a new challenge ahead of us and ...