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lyobbins^

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SBU Division

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Double Shield TBM (SBU-DS)

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Technical Description

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The Double Shield TBM (SBU-DS) is ideal for long tun-

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nels (over 3,300 ft) without intermediate access. The

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SBU-DS is a manned-entry, hard rock tunnel boring

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machine. The machine is used in conjunction with a

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single-track back-up system for auxiliary functions. In

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unstable ground, the SBU-DS can erect liner within the

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tail skin, while in stable ground the machine can be

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used without lining. Muck is removed using muck trains

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with conveyor-loading muck skips.

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Tunneling with No Limitations

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Not just for utility crossings, the SBU-DS can bore

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entire tunnels in much harder rock than other SBU

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Division products. A ring bearing and bull gear drive

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allow for larger diameter 17 inch disc cutters to be used,

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with greater thrust and higher torque. The machine is

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capable of boring in rock of 44,000 psi UCS or higher

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over long distances.

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Guided Boring

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The SBU-DS can be steered throughout the drive using

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hydraulic stabilizer pads and articulation cylinders. Line

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and grade accuracy is continuously monitored with a

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laser targeting system.

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SBU-DS APPLICATIONS

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• Long tunnels with no intermediate access

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• Line- and grade-critical tunneling

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• Bore lengths from 1,600 to over 20,000 ft

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AVAILABLE FOR PURCHASE OR LEASE

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