ROBBINS

SBU DIVISION
Metric Version

MOTORIZED SMALL BORING UNIT (SBU-M)
The Motorized SBU is the optimal choice for longer utility installations
(over 100 m) or for crossings with specific line and grade requirements. The
SBU-M is an intermittently manned, articulated mixed ground and hard rock
boring machine for use with standard Auger Boring Machines (ABMs) or pipe
jacking systems. The SBU-M is attached to the lead pipe or casing and uses
disc cutters to excavate rock, or a mixture of both disc cutters and soft ground
tooling for mixed ground. 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
cutterhead, while forward thrust is derived through the casing via the ABM.

SBU-M APPLICATIONS
• Pipe jacking
• Line- and grade-sensitive
rock crossings
• Alternative to microtunnelling
in dry to near dry rock/ mixed
ground conditions
• Bore lengths over 100 m

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 continuous 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 tools tend to break off
in rock above 50 MPa UCS. The
SBU-M uses disc cutters to chip
away hard rock from 25 to over 175
MPa UCS.

AVAILABLE FOR
PURCHASE OR LEASE