Hi, I’m Doug Koehler with Geoprobe Systems® here to introduce our newest geotech rig designed specifically for the geotech market - the Geoprobe® Model 3126GT. This compact, off-road rig simplifies many traditional geotech drilling techniques, including augering, mud rotary, rock coring, SPT, and Shelby Tubes.
Plus it includes features to easily push CPT and a direct push hammer for all your traditional environmental sampling. With all this versatility, you’ll increase rig utilization rates, and ultimately increasing your profits.
Immediately you will notice how quickly the machine sets up and how easy it is to use. Once you position the drill mast there’s no need to move it again thanks to the innovative centerline head side shift. The head side shift easily allows all functions to line up over the hole as well as your winch lines. This reduces time transitioning from function to function, ultimately increasing efficiency in the field. A well designed control panel and integrated safety features brings new drillers up the learning curve quickly.
Today we’re going to show you a traditional geotechnical boring as well as a traditional direct push boring using the 3126GT. Watch how fast the 3126GT sets up and transitions between functions, allowing you to drill more and ultimately make more.
First, a standard SPT sample will be taken through 3.25 inch Hollow Stem Augers. The functions along the head side-shift that will be used include the rotary head, automatic drop hammer, and winchline. The head is raised and the rotary head is quickly side-shifted above the auger. Once pinned in place, the rotary head can be run with either the manual control lever or hands-free controls. Side-shifting the head over allows access for the winch to pull the inner rod string and pilot bit. The hole is now ready for the split spoon and rods. Using the head side shift, the automatic drop hammer is easily placed over the drive cap. Once in place, SPT sampling can begin. Having the winch, rotary head, and automatic drop hammer on the same line makes transitioning from function to function fast and easy.
Next, we’re going to take a DT37 soil sample and then transition to SPT sampling through the driven casing. The functions along the head side-shift that will be used include the GH63 percussion hammer, automatic drop hammer, rod grip puller, and winchline. The intuitive control panel makes each function easy to access and is easy to learn for a new driller. Using the GH63 percussion hammer, the 3.75 inch casing and inner DT37 sample sheath are driven to depth. Using the spring assisted swivel pull cap and winchline, the inner sheath is removed with the soil sample.
Depending on the hole, the operator can continue taking DT37 soil samples or switch to SPT sampling as the hole is now open at the bottom of the rod string. In this case, an SPT sample will be taken using an AWJ rod string and the Geoprobe® interlocking split spoon sampler. Side shifting the head brings the drop hammer into place over the tool string. Once in place, SPT sampling can begin. After taking the sample, the head is side-shifted over and the winchline is used to pull the split spoon from the hole. The rod grip puller on the side of the head is used to pull the 3.75 inch casing.
If the job calls for taking an SPT sample through mud rotary, the foot of the machine can be to allow space for a mud pan.
With the head side-shift on the Geoprobe° 3126GT Geotechnical Rig, setup is quick and transitioning between functions is seamless. There is no need to move the machine or drill mast to switch between functions. With the Geoprobe® 3126GT, you can drill more and make more.
For more information on the 3126GT, visit our website or call us at 785-825-1842.