Double Shield TBM (SBU-DS) Technical Description The Double Shield TBM (SBU-DS) is ideal for long tunnels (over 1,000 m) without intermediate access. The SBU-DS is a manned-entry, hard rock tunnel boring machine. The machine is used in conjunction with a single-track back-up system for auxiliary functions. In unstable ground, the SBU-DS can erect liner within the tail skin, while in stable ground the machine can be used without lining.Muck is removed using muck trains with conveyor-loading muck skips. Tunnelling with No Limitations Not just for utility crossings, the SBU-DS can bore entire tunnels in much harder rock than other SBU Division products. A ring bearing and bull gear drive allow for larger diameter 17 inch disc cutters to be used, with greater thrust and higher torque. The machine is capable of boring in rock of 300 MPa UCS or higher over long distances. Guided Boring The SBU-DS can be steered throughout the drive using hydraulic stabilizer pads and articulation cylinders. Line and grade accuracy is continuously monitored with a laser targeting system. SBU-DS APPLICATIONS • Long tunnels with no intermediate access • Line- and grade-sensitive tunnelling • Bore lengths from 500 to over 6,000 m AVAILABLE FOR PURCHASE OR LEASE

Side View Hydraulic Stabilizer Grip per Shield Cylinder Ring Beam Expander High Capacity Chd Drive Torque Cylinder Tail Shield Tow SyMem Main Searing Motor Front View MACHINE DIAMETERS ROCK STRENGTHS GROUND CONDITIONS 2.0 to 3.0 m (larger sizes available) Medium to very hard rock, or mixed ground Both hard rock and mixed ground cutterheads are available All machines can be equipped with 14 inch or 17 inch discs Bore Diameter Boring Stroke Main Bearing Machine Thrust Cutterhead Drive Drive Motors Tapered Roller Bore Diameter Boring Stroke Main Bearing Machine Thrust Cutterhead Drive Drive Motors...