Civil Engineering Reference
In-Depth Information
Figure 21.11
Working cycle of a Gripper TBM (Wittke et al. 2006)
Gripper TBMs are mostly equipped with partial shields or hoods which serve as protec-
tion against falling rock and are often extended backwards by lamellae. Such a lamella
roof, also called a “finger shield”, bridges the unsupported area between the shield and
the area in which the support will be installed.
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