Shielded Hard Rock TBMs

Single Shield TBMs are the ideal machine type for tunnelling through rock and other stable soils. In many cases, they are the optimum solution for tunnelling with very high rock strengths both in pipe jacking and segmental lining. Double Shield TBMs unify the functional principles of Gripper and Single Shield TBMs in one machine and achieve very high tunnelling performances in stable rock. This technology is therefore perfectly suited for excavating long tunnels in hard rock.