SBU Division Motorized Small Boring Unit (SBU-M) Technical Description The Motorized SBU is the optimal choice for longer utility installations (over 150 m) or for crossings with specific line and grade requirements. The SBU-M is a manned-entry, hard rock boring machine for use with a standard Auger Boring Machine (ABM) or pipe jacking unit. The SBU-M uses disc cutters to excavate rock, while a small invert auger or vacuum system removes spoils from the face. The SBU-M is bolted to the lead casing prior to excavation for shorter starter and exit shafts. An in-shield motor provides torque to the drive train, while forward thrust is derived through the casing. The Most Accurate Tunneling The SBU-M can be steered throughout the drive from an operator’s console inside the rear shield. Articulation cylinders and manually adjustable stabilizer pads allow for control of line and grade. Accuracy is continuously monitored using a laser targeting system. A Cost Effective Solution The SBU-M offers more efficient excavation than typical carbide bit or roller cone cutting heads. Most carbide cutting tools tend to break off in rock above 75 MPa UCS. The SBU-M uses disc cutters to chip away hard rock from 25 to over 175 MPa UCS. SBU-M APPLICATIONS • • • • Pipe jacking Line- and grade-sensitive rock crossings Replacement for carbide bit and roller cone cutterheads Bore lengths over 150 m AVAILABLE FOR PURCHASE OR LEASE

Side View articulating front shield operator station hydraulic or electric drive assembly cutterhead stabilizer pad articulation cylinders invert auger assembly Front View SPECIFICATIONS MACHINE DIAMETERS 1.2 to 2.0 m ROCK STRENGTHS 25 to over 175 MPa UCS GROUND CONDITIONS Medium to hard rock, or mixed ground CUTTERHEADS Both hard rock and mixed ground cutterheads are available CUTTERS All machines can be equipped with 165, 241, 292, or 356 mm (6.5, 9.5, 11.5, 14”) discs NOTE: Hydraulic and electric motors are available. Contact us for more information on hydraulic models. SBU-M 48 Bore Diameter...