Double shield tunnel boring machine (TBM) WIRTH

This type of boring machine is used for tunneling in stable to unstable rock for the excavation of traffic tunnels (road and rail), supply tunnels (water, gas and electricity) and other special applications.



The main elements in the construction of the shield tunnel boring machine are the shield which gives the machine its name, a construction like a steel tube in which all other components of the machine are embedded, the cutter head and its drive housing, the advance mechanism and the robot-like device for installation of the tunnel lining, the so-called erector. The tunnel lining, usually consisting of prefabricated concrete sections, is installed with the erector, protected by the rear shield mantle, the so-called tail shield.

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