Rock Boring

Rock Boring

Rock boring is a trenchless technique to install steel casing that uses the same means and methods of auger boring, however, the cutter head and tooling is purpose built for rock applications. The cutter heads are outfitted with roller disc cutters that penetrate the rock creating microfractures between the disc cutter paths. Thrust is provided by the auger bore machine. As the disc cutter head advances, the rock fractures and creates chips. Scoops on the cutter head periphery transition the material into the auger string for removal. The stabilizer pads or shoes located on the outside of the rock boring unit maintain a concentric cutter path and make minor steering corrections along the alignment.

Rock boring is commonly used in crossings up to 300‐ft. with steel casing diameters common in the pipeline utility industry. Tooling capabilities vary based on the cutter head design and installation diameter; however, 15,000 psi are achievable.

To serve the increasing demands for rock boring, Akkerman carries an extensive inventory of Rock Boring Units (RBU) ranging from 24‐in to 48‐in that are available for sale or lease.

To learn more about our equipment and how it can help you on your next project, navigate to the equipment section of our website or contact one of our sales representatives for more information.

How to Choose Your Submethod

Akkerman Submethods

Machine Diameter

24-48 inches

Akkerman Submethods

Ground Conditions

Up to 15,000 psi

Akkerman Submethods

Drive Length


Akkerman Submethods

Shaft Size

Varies based on project

Akkerman Submethods

Guidance System


Case Studies

GBM Case Study – Rock Boring

The City of Oshkosh’s annual Capital Improvement Plan included concrete paving, utilities upgrades, an upgraded wastewater pump station, and appurtenant work. The utility upgrades included a crossing that passed under an active rail line in rock ground conditions, to increase the capacity of the sewer.

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