Topics and projects,
Tunnelling
Second tube Gotthard Tunnel: first tunnel boring machine "Carla" at target
record of 45.4 m per day Sometimes Carla, with its trailers, travelled more than 200 m slowly, sometimes much faster than planned, depending on the nature of the rock. On average, Carla covered about 17 m per day. Her record performance is 45.4 m per day, achieved in rather soft gneiss. Tunneling is teamwork "It's great that we were able to excavate the northern access tunnel […]