Tunnel boring machines manufacturer for major tunnel projects
Ranked amongst the most important tunnel-boring machine manufacturers on the world market, NFM Technologies provides its customers with tunneling machines of 4 to more than 15 metres in diameter, suited to all types of geology, acknowledged for their reliability and robustness.
Bertha was designed and manufactured by Hitachi Zosen Sakai Works of Osaka, Japan, and is the world's largest earth pressure balance tunnel boring machine, at a cutterhead diameter of 57.5 feet (17.5 m) across.
Big Bertha, world's largest tunnel-boring machine, arrives in ...
The "Big" in Bertha's name isn't there for the catchiness. It's there because it's apt. With a 57-foot diameter and a length of a football field, Big Bertha is the world's largest tunnel-boring machine.
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