Guided Auger Boring

Guided Auger Boring

Pilot Tube Guided Auger Boring (PTGAB) is one of the most popular and cost-effective trenchless methods to accurately install steel casing for underground utilities, waterlines, and sanitary sewers.  This method combines the pinpoint accuracy of the pilot tube installation to control line and grade with the excavation process of horizontal auger boring.


Step One

Step Two

For more information on the GAB method or to learn about our newest innovations in GAB, please contact our experienced sales representatives.

How to Choose Your Submethod

Akkerman Submethods

Machine Diameter

4-48 inches and larger with select tooling

Akkerman Submethods

Ground Conditions

Projects with displaceable N Value or SPT = < 50 Non‐displaceable N Value > 50 in homogeneous ground with appropriate tooling/equipment

Akkerman Submethods

Drive Length

Up to 600 feet

Akkerman Submethods

Minimum Shaft Size

10-ft. trench box length

Akkerman Submethods

Guidance System

Active Theodolite

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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