Mechanical excavation Excavation using a tunnel boring machine (TBM) Steering cabin Lif ting crane Machinery for the installation of steel grilles Cutting head Gripper Conveyor belt Concrete spraying machine The tunnel boring machines used in the construction of the Brenner Base Tunnel are, depending on the prevailing requirements, approximately 180 - 400 metres long and consist of a drilling head and a trailing structure. The advantage of mechanical excavation is its high daily production rate. Working with the TBM also offers the workers a relatively high standard of occupational safety. The most important part of the TBM, which is actually a high-technology underground logistics plant, is its cutter head. This has a diameter of about ten metres and consists of several drilling bits that press against the rocks and break them into small pieces. The trailing structure behind the drilling head, or back-up, is used to supply the excavation and remove the excavated material. The machine also includes rock stabilisation, ventilation and dust collection equipment. Clearance envelope Water pipe / fire extinguishing system Sidewall drainage Track drainage Ballastless track Abutment Multi cable duct Excavation stabalization / primary shotcrete lining Waterproofing system Inner lining Cross section excavation by blasting 17 BRENNER BASE TUNNEL
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