Microtunneling boring machine (MTBM) The Robbins Company

Robbins Small Boring Units (SBU-As)
The SBU-A is a small diameter rock cutting head (from 24"/600 mm to 72"/1.8 m) that can be used with any Auger Boring Machine (ABM) to excavate hard rock on drives less than 500 ft (150 m). The Robbins SBU-A has been proven on hundreds of jobs across the U.S. Over one hundred contractors in locations around the world have proven the SBU-A works better than any other method of excavating small diameter, hard rock bores.

Robbins Motorized Small Boring Units (SBU-Ms)
If you need to bore a small diameter tunnel in hard rock where line and grade are critical, Robbins offers Motorized Small Boring Units (SBU-Ms). These machines have been specifically designed for long bores (over 500 ft/150 m) with difficult ground conditions. They are offered in cutterhead diameters from 48"/1.2 m to 78"/2.0 m. If you are not familiar with SBU-As, we suggest you read about them before researching SBU-Ms.

Robbins Rockhead (SBU-RHSS or SBU-RHDS)
If line and grade are critical and you have a longer bore (over 1000 ft/300 m in length) for your next project, you should consider the Robbins Rockhead. The diameter range is available between 54" (1.35 m) and 78" (2.0 m). The Robbins Rockhead is a powerful mid-sized tunneling machine available in both Single Shield and Double Shield models.

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