and the machine purpose-built for the job is the world's largest tunnel boring machine (TBM), christened "Bertha." Built by Hitachi Zosen, the 300-foot-long doomsday machine is excavating a 57.5 ...

HAMPTON, Va. — On April 17, Mary the Tunnel Boring Machine emerged through the headwall at the Hampton end of the HRBT. Exactly six months later, she's starting her next journey: creating the ...

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 ...

Tunnel boring machines (TBMs) prefer to chew rocks, not mud. Besides, they can't support the wet ground, so the tunnel walls are collapsing! TBMs work much better in rock tunnels. Try this ...

Mary, the tunnel-boring machine, is on the move again! Thursday, Mary began boring a twin eastbound tunnel in part with the Hampton Roads Bridge-Tunnel Expansion Project. Watch: First of 4 ...

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 Seattle snowpocalypse may have slightly delayed the start of the demolition of the now-closed Alaskan Way Viaduct, but there’s no stopping the fact that the aged elevated roadway will ...

The machine is named Jianghai, which means “river and ocean” in Chinese. It weighs approximately 5,000 metric tons (11 ...

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 ...

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 ...

China has completed the production of its largest tunnel-boring machine (TBM), measuring 16.64 meters (54.5 feet) in diameter. The machine is named Jianghai, which means "river and ocean" in Chinese.