SBU Division

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