Mixshield tunnel boring machine (TBM) WIRTH

Tunneling systems for mixed ground
Dual mode - two process technologies in one
As the term 'dual mode' indicates, two process technologies are combined in these machines.

Shield machines
These machines are externally similar to shield machines and combine the functional features of a hard-rock shield tunnel boring machine and, optionally, of a slurry shield or a hydroshield machine (Bentonair, slurry shield). They are always used when tunnels have to be driven alternately in stable and unstable sections.

New style machines
Dual-mode tunnel boring machines are still a new type of machines and have been developed to meet the requirements of complex projects in strongly varying geologies. Where conventional tunneling techniques had to be used formerly, these machines now open the way to lower-risk and lower-cost tunneling in difficult geological conditions

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