Maximum precision

Assembling and shifting TBM 2. Gotthard tunnel

DSD Heavy Lift AG took on the challenging task of assembling and shifting the tunnel boring machine (TBM) in Göschenen for the construction of the second Gotthard tunnel tube. Due to limited space, a standard lifting frame could not be used. Instead, we deployed our specially designed lifting gantry with a capacity of 360 tons.

A key challenge was the precise lifting of the 355 ton cutterhead, which had to be raised in the air, rotated, and assembled with millimeter accuracy.

The 110 meter long TBM was assembled on an 80 meter pre assembly place, rotated at a 4,5 degree angle, and shifted into the tunnel in sections. Our space saving shifting system first lifted the TBM slightly before carefully pulling it into the tunnel using our pulling unit. Since the system required only 30cm of space under the machine, the tunnel excavation was minimized, ensuring efficient and precise positioning for the shift. One of the main challenges was shifting the TBM over a 410 meter distance, which included a curve with a 420 meter radius.

In total, we moved the 1’800 ton TBM 410 meters, including 375 meters inside the tunnel. Our hydraulically controlled strand jacks and shifting system allowed for millimeter precise control. The assembly and shifting process were successfully completed in less than four months, from August to December 2024.

This project highlights our expertise in precise assembly and shifting of heavy loads under challenging conditions. With innovative solutions, DSD Heavy Lift AG continues to set new standards.