It’s not a bad thing though, as it makes it easier to prevent the machine from digging in too deep and bogging down. In very wet or ice-packed snow, we expect you’ll have to put in a similar ...
In many cases, this has resulted in increased durability and digging performance to compliment the greater lifting capacity and height these machines afford compared to their radial lift counterparts.
Known as Bertha, the world's largest tunneling machine weighs 7,000 tons and measures 57.5 feet in diameter. It began work in July 2013 and broke down in early December, after digging just 1,023 ...