Robbins Tunnel Boring Machines (TBM)

Our single shield and double shield TBMs provide maximum worker protection in bad ground, while each offers distinct technical advantages.
Double shield TBMs are designed to achieve the rapid advance rates contractors have come to expect from our main-beam TBMs. Their adaptability to changes in geology gives them the long-term economic advantage they seek from one machine. And in the worst ground conditions when the rock is so broken that lateral force cannot be applied to the tunnel walls, the machine operates as a single shield, using the lining to react forward thrust.
The single shields are the preferred alternative when the tunnel geology ranges from soil to rock.


Main features of shielded TBMs:

  • Custom designed cutterheads to optimize cutter spacing and muck removal, reducing cutter costs and cutterhead wear
  • Low-profile cutterheads with rear-changing cutters provides face support, prevents cutterhead stalling and protects workers during cutter changes
  • Segment erector in the tail shield installs any type of prefabricated lining such as concrete segments, cast iron, ring beams or lagging
  • Equipment for grouting in front as well as rock drills for probing the ground ahead in wet conditions can be integrated into any shield design
  • Wire brush seals can be installed in the tail shield where the segments are erected to protect the TBM in case of water pressure
  • Digital guidance system provides continuous information to the operator regarding the machine´s location relative to true alignment and corrective steering adjustments
  • Offered choice of 2-speed electric, variable frequency or hydraulic

Technical specifications of shielded TBM:
DescriptionCutterhead ø
m
Max. Power
kW
Torque
kNm
Thrust
kN
Shield thrust
kN
Auxiliary thrust
kN
3409-123500134002020051000102000
2907.5-1030009600173003460069200
2406.5-8.525006600146002920058400
2005-72250522012002400048000
1704-620003840107002140042800
1403.5-51500240093001860037200
1203-4125016807500150030000
1002.5-375010504500900018000
801.6-2.55207502600520010400
Technical specifications of main beam TBM:
DescriptionCutterhead ø mMax. Power
kW
Torque
kNm
Thrust
kN
3409-123465733020215
2907.5-103150655017290
2406.5-8.5252036602820
2005-72205282012000
1704-61890200010700
1403.5-5157513809310
1203-412609307500
1002.5-310005606120
Main features of main beam TBM:

  • Custom designed cutterheads to reduce cutter costs and cutterhead wear
  • Cutterhead stabilization through a sliding support shoe, hydraulically actuated roof and side supports
  • Three-axis heavy-duty main bearings provide long life in toughest underground conditions
  • Water-cooled electric motors mounted in direct connection to the final reduction ring gear
  • Floating grippers allow operators to steer horizontally as well as vertically while boring
We reserve the right to change technical specifications without prior notice.