INCREDIBLE SWITZERLAND BIGGEST TUNNEL -HOW DOES TUNNEL BORING MACHINE WORK* >>

INCREDIBLE SWITZERLAND BIGGEST TUNNEL
A tunnel-boring machine usually performs the excavation process with its rotating head that makes a hole in the ground by using a motor with a hydraulic or electric system. The tunnel-boring machine with cutting elements that can have different shapes and be made of different materials.
The same company built the world's largest-diameter slurry TBM, excavation diameter of 17.6 metres (57 ft 9 in), owned and operated by the French construction company Dragages Hong Kong (Bouygues' subsidiary) for the Tuen Mun Chek Lap Kok link in Hong Kong.