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3100GT

Geotechnical Rotary Rig

Geotechnical sampling – Powerful, Flexible, Fast, Easy on Drillers

The Geoprobe® 3100GT Geotechnical Rig is designed to quickly perform SPT borings (augers & mud rotary), collect shelby tube samples, take rock cores, and push CPT cone…all on a 19,500 GVWR truck that does not require a CDL (Class A/B) to operate.

❯ Contact Us

> Download Specs

3100GT

Geotechnical Rotary Rig


Geotechnical sampling – Powerful, Flexible, Fast, Easy on Drillers

The Geoprobe® 3100GT Geotechnical Rig is designed to quickly perform SPT borings (augers & mud rotary), collect shelby tube samples, take rock cores, and push CPT cone…all on a 19,500 GVWR truck that does not require a CDL (Class A/B) to operate.

❯ Contact Us

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Features & Options

Click on a section below to learn more about the features and options of the 3100GT.

Geoprobe® 3100GT running hollow stem augers.

Geoprobe® 3100GT running hollow stem augers.

Over the last 15 years Geoprobe® has increasingly been supporting customers focused on successful geotechnical investigations. On many geotech sites, the need for speed and efficiency is of the utmost importance. The specific methods of geotechnical sampling varies greatly and are usually dependent on a combination of subsurface site conditions and what is considered an acceptable practice in the geographic region. The Geoprobe® engineering team set out to design a rig specifically for geotechnical sampling that could quickly perform SPT borings (augers & mud rotary), collect shelby tube samples, take rock cores, and push CPT cone…all on a 19,500 GVWR truck that does not require a CDL to operate. From this vision, the all new Geoprobe® 3100GT was born.

The 3100GT has multiple rotary head options mounted on a side shifting carriage.

The 3100GT has multiple rotary head options mounted on a side shifting carriage.

The 3100GT has multiple rotary head options mounted on a side shifting carriage:

  • GA4000 (4000 ft-lb, 150 rpm) 
  • GA4100 (4000 ft-lb, 650 rpm) 
  • CB5 (6000 ft-lb, 600 rpm) 
  • All heads provide full torque in forward and reverse 
  • 26-in. of head side-shift  
The auto drop hammer on the 3100GT.

The auto drop hammer on the 3100GT.

The automatic drop hammer can quickly and easily be deployed without needing to be man-handled. 

The drill mast has a class leading push and pull force (36,000/48,000 lbs).

The drill mast has a class leading push and pull force (36,000/48,000 lbs).

The drill mast includes 105-in. of head feed travel. This gives you plenty of room to catch the odd interval, or to easily add a swivel under the head. Additionally, it has a class leading push and pull force (36,000/48,000 lbs).

The drill mast can easily be shifted exactly where the hole dictates.

The drill mast can easily be shifted exactly where the hole dictates.

With extend, swing, mast dump, oscillation, and fold, the operator can quickly deploy and position the drill mast exactly where the hole dictates. Drill mast outriggers let you quickly setup above a mud pan as well. 

The telescoping mast extends for tripping out longer tooling.

The telescoping mast extends for tripping out longer tooling.

The telescoping winch mast reduces overall height but still allows the tripping out of 20-ft. lengths of rod when combined with the 3-ft. extension.

The control panel on the 3100GT includes a side compartment for small tool storage.

The control panel on the 3100GT includes a side compartment for small tool storage.

The manual controls provide the tactile feel that some drillers prefer and the electric control adds safe hands-free operation.

The deck of the 3100GT.

The deck of the 3100GT.

High capacity hydraulics powered from the truck engine saves weight and deck space. The high flow primary pump runs at 47 gpm and 4000 psi. A separate hydraulic pump is just for the mud pump.

Features & Options


Geoprobe® 3100GT running hollow stem augers.

Geoprobe® 3100GT running hollow stem augers.

Video: Geoprobe® 3100GT Features

Over the last 15 years Geoprobe® has increasingly been supporting customers focused on successful geotechnical investigations. On many geotech sites, the need for speed and efficiency is of the utmost importance. The specific methods of geotechnical sampling varies greatly and are usually dependent on a combination of subsurface site conditions and what is considered an acceptable practice in the geographic region. The Geoprobe® engineering team set out to design a rig specifically for geotechnical sampling that could quickly perform SPT borings (augers & mud rotary), collect shelby tube samples, take rock cores, and push CPT cone…all on a 19,500 GVWR truck that does not require a CDL to operate. From this vision, the all new Geoprobe® 3100GT was born.

Multiple Rotary Head Options on a Side Shifting Carriage


The 3100GT has multiple rotary head options mounted on a side shifting carriage.

The 3100GT has multiple rotary head options mounted on a side shifting carriage.

The 3100GT has multiple rotary head options mounted on a side shifting carriage:

  • GA4000 (4000 ft-lb, 150 rpm) 
  • GA4100 (4000 ft-lb, 650 rpm) 
  • CB5 (6000 ft-lb, 600 rpm) 
  • All heads provide full torque in forward and reverse 
  • 26-in. of head side-shift  

Automatic Drop Hammer (Hands Free)


The auto drop hammer on the 3100GT.

The auto drop hammer on the 3100GT.

The automatic drop hammer can quickly and easily be deployed without needing to be man-handled. 

Drill Mast


The drill mast has a class leading push and pull force (36,000/48,000 lbs).

The drill mast has a class leading push and pull force (36,000/48,000 lbs).

The drill mast includes 105-in. of head feed travel. This gives you plenty of room to catch the odd interval, or to easily add a swivel under the head. Additionally, it has a class leading push and pull force (36,000/48,000 lbs).

Drill Mast Positioning


The drill mast can easily be shifted exactly where the hole dictates.

The drill mast can easily be shifted exactly where the hole dictates.

With extend, swing, mast dump, oscillation, and fold, the operator can quickly deploy and position the drill mast exactly where the hole dictates. Drill mast outriggers let you quickly setup above a mud pan as well. 

Telescoping Dual Winch Mast


The telescoping mast extends for tripping out longer tooling.

The telescoping mast extends for tripping out longer tooling.

The telescoping winch mast reduces overall height but still allows the tripping out of 20-ft. lengths of rod when combined with the 3-ft. extension.

Manual Controls with Electrical Augmentation


The control panel on the 3100GT includes a side compartment for small tool storage.

The control panel on the 3100GT includes a side compartment for small tool storage.

The manual controls provide the tactile feel that some drillers prefer and the electric control adds safe hands-free operation.

High Capacity Hydraulics Powered from the Truck Engine


The deck of the 3100GT.

The deck of the 3100GT.

High capacity hydraulics powered from the truck engine saves weight and deck space. The high flow primary pump runs at 47 gpm and 4000 psi. A separate hydraulic pump is just for the mud pump.

Tooling & Accessories

Click on a section below to learn more about the tooling & accessories for the 3100GT.

The interlocking design self aligns during assembly and is quick to disassemble

The interlocking design self aligns during assembly and is quick to disassemble

Our patented interlocking split spoon sampler is a unique geotechnical innovation from Geoprobe® that is engineered to greatly benefit your field team. It is built to be 2X stronger, last longer, and saves both money and field time over a conventional split spoon. Additionally, it meets ASTM Standard D1586.

The interlocking design provides axial alignment of the tube halves, making for a quicker assembly of the sampler. Each time it goes together it self aligns, creating a perfect fit. With the threads aligned, the cutting shoe and drive head can be threaded to the split spoon. The threads are a multi-lead, which requires fewer turns during assembly and disassembly over conventional split spoons. Less time is spent during assembly and disassembly, which speeds up each test interval.

In additional to time savings, the interlocking split sheath has two times the strength and durability of conventional split spoons. Enhanced material properties and manufacturing result in greater longevity. Design plays an important role as well. Each interlocking point keeps the two tube halves engaged throughout the sampling process. The strength of these connections prevents the sampler from bulging in dense materials. It also keeps the tube halves tightly engaged even when over-filling of the sampler occurs.

*Split tube soil sampling system manufactured under U.S. Patent 9,551,188

Tooling & Accessories


Interlocking Split Spoon

The interlocking design self aligns during assembly and is quick to disassemble

The interlocking design self aligns during assembly and is quick to disassemble

Video: Interlocking Split Spoon Overview

Our patented interlocking split spoon sampler is a unique geotechnical innovation from Geoprobe® that is engineered to greatly benefit your field team. It is built to be 2X stronger, last longer, and saves both money and field time over a conventional split spoon. Additionally, it meets ASTM Standard D1586.

The interlocking design provides axial alignment of the tube halves, making for a quicker assembly of the sampler. Each time it goes together it self aligns, creating a perfect fit. With the threads aligned, the cutting shoe and drive head can be threaded to the split spoon. The threads are a multi-lead, which requires fewer turns during assembly and disassembly over conventional split spoons. Less time is spent during assembly and disassembly, which speeds up each test interval.

In additional to time savings, the interlocking split sheath has two times the strength and durability of conventional split spoons. Enhanced material properties and manufacturing result in greater longevity. Design plays an important role as well. Each interlocking point keeps the two tube halves engaged throughout the sampling process. The strength of these connections prevents the sampler from bulging in dense materials. It also keeps the tube halves tightly engaged even when over-filling of the sampler occurs.

*Split tube soil sampling system manufactured under U.S. Patent 9,551,188

> Learn More

Videos


Overview

Specifications

Click below to view standard specifications. Specifications are subject to change without notice.

Overall Dimensions
Width98.5 in.2,502 mm
Length (transport)275 in.6,985 mm
Length (transport) ft.6.985 m
Length (deployed, lateral fully extended)319 in.8,103 mm
Height (normal transport)120 in.3,048 mm
Height (deployed; winch mast up)277 in.7,036 mm
Height (deployed; winch mast up)23.1 ft.7.036 m
Unit Weight (w/ typical options)18,200 lbs.8,255 kg
Drill Mast Positioning
Extension (fore and aft)15 in.381 mm
Lateral (side to side) (± degrees)4 degrees4 degrees
Oscillation (degrees from vertical)10 degrees10 degrees
Drill Mast Dump45 in.1,143 mm
Toe Rigger travel16 in.406 mm
Drill Mast Specifications
Head Travel105 in.2,667 mm
Head Crowd Force36,000 lbs.160.1 kN
Head Pull Force48,000 lbs.213.5 kN
Head Feed CarriageComp. Slides Comp. Slides
Head Sideshift26 in.660 mm
Rotary Drive Options
2-Speed Rotary DriveGA4000 GA4000
Rotation Torque (Range 1)4,000 ft-lb5,423 N-m
Rotation Speed (Range 2)150 rpm150 rpm
Hex Adapter1.625 in.41 mm
4-Speed Rotary DriveGA4100 GA4100
Rotation Torque (Range 1)4,000 ft-lb5,423 N-m
Rotation Speed (Range 4)750 rpm750 rpm
Hex Adapter1.625 in.41 mm
Primary Winch
line pull7,000 lbf31.1 kN
line speed130 fpm39.6 m/min
cable length75 ft.22.7 m
Second Winch
line pull1,800 lbf8.0 kN
line speed125 fpm38.1 m/min
cable length100 ft.30.5 m
Breakout
Single Clamp
Max Clamp force21,000 lbf93.4 kN
Breakout torque6,000 ft-lb8,135 N-m
Min Casing size compatible1.25 in.31.6 mm
Max Casing size compatible7 in.177.8 mm

Resources

Click on a section below to view information.

Geoprobe® 3100GT running hollow stem augers.

Geoprobe® 3100GT running hollow stem augers.

The 3100GT has multiple rotary head options mounted on a side shifting carriage.

The 3100GT has multiple rotary head options mounted on a side shifting carriage.

The auto drop hammer on the 3100GT.

The auto drop hammer on the 3100GT.

The drill mast has a class leading push and pull force (36,000/48,000 lbs).

The drill mast has a class leading push and pull force (36,000/48,000 lbs).

The drill mast can easily be shifted exactly where the hole dictates.

The drill mast can easily be shifted exactly where the hole dictates.

The telescoping mast extends for tripping out longer tooling.

The telescoping mast extends for tripping out longer tooling.

The control panel on the 3100GT includes a side compartment for small tool storage.

The control panel on the 3100GT includes a side compartment for small tool storage.

The deck of the 3100GT.

The deck of the 3100GT.

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