Guided auger boring is one of the most popular trenchless methods for accurate installation of steel casings in North America. Akkerman offers several tools contractors can select to adapt their pilot tubes to steel casing based on the projects’ ground conditions.
GBM Bearing Swivel
Once the pilot tubes are installed on line and grade, the GBM bearing swivel assembly is installed between the last pilot tube and the cutterhead driven by the rotating auger string.
The pilot tube Guide Rod Swivel (GRS) cutterhead welds onto the lead casing and contains an internal swivel bearing located behind the cutting face. The bearing assembly is interchangeable between multiple casing diameters and keeps the casing on line and grade achieved from the installed pilot tubes. The needle connection between the GRS cutterhead and pilot tubes allows for fluid delivery from the reception shaft to assist difficult bores, while retractable cutters allow tripping of augers if an obstacle is encountered.
High Torque Casing Adapter (HTCA)
The HTCA attachment turns the already versatile 4800 series GBM system into an 88,000 ft-lbf monster machine able to perform all guided auger bore functions. The HTCA simply locks into place directly in front of a 4800A GBM and includes the master ring, dirt paddles, and discharge chute to install steel casing up to 36in. With an HTCA installed on a 4800A, contractors can perform guided auger boring in smaller shafts without dangerous exhaust gases.
Benefits & Features
- GBM Bearing Swivel connects to your existing auger boring cutterhead or lead auger.
- Bearing Swivel and GRS Cutterhead suitable for densely compacted ground and soft rock.
- Interchangeable GRS bearing assembly saves contractors money.
- GRS Cutterheads utilize 6×5 inch hex adapter for ultimate durability and mating versatility.
- GRS Cutterheads feature wing cutters suitable for auger removal.
- HTCA allows 4800A GBM owners to use one piece of equipment to install pilot tubes and auger bore steel casing with one set-up, while minimizing shaft size and reduce the disturbance of a diesel engine running below grade.
GBM Bearing Swivel Assembly
Guided Rod Swivel 50 – Models GRS-24, GRS-26, GRS-28, GRS-30, GRS-36
High Torque Casing Adapter (HTCA)
Augering Adapter Assembly
|Bearing Swivel||50 ton||Up to 24 in||100-lbs.|
Guide Rod Swivels
|GRS-24||50 ton||24 in||1,200-lbs.|
|GRS-26||50 ton||26 in||1,300-lbs.|
|GRS-28||50 ton||28 in||1,400-lbs.|
|GRS-30||50 ton||30 in||1,500-lbs.|
|GRS-36||50 ton||36 in||1,800-lbs.|
High Torque Casing Adapter
|Model||Torque (lo/hi)||Speed (hi / lo)||Weight|
|HTCA-4800||40,000 ft-lbf / 88,000 ft-lbf||16 rpm / 10 rpm||4,800-lbs.|
Our interaction with Akkerman began on a project where we were struggling with their competition’s machine. Changing machines during a project to their machine required a leap of faith on our part. That project completed 20 years ago turned out to be successful and propelled us into 20 years of completing scores of successful micro tunnel projects throughout North America. Providing many innovations throughout this time has allowed us to mine many geology types and increase drive distances with curves to over 2500 lf. I can attest 30 years ago, technology did not exist that today allows us to complete projects efficiently and at a lower cost. Their leadership in providing technically superior AMERICAN made equipment is second to none in the world today.