3100GT Geotechnical Drill Rig

Six functions along the 28-inch centerline head side shift simplify traditional geotechnical applications — augering, mud rotary, SPT, Shelby tubes, hard rock cores, CPT – and even direct push. Features GH63 percussion hammer 4-speed rotary head with 4,000 ft-lb, DH104 hands-free automatic drop hammer, CPT push/pull assembly, and a rod grip pull system. Head shifting speeds up drilling and minimizes the time driller spends in danger zone.

With 170-lb, 300-lb, or 340-lb options, the hands-free automatic drop hammer reduces strain when driving SPT samples. Advance borings for SPT testing by augering, driven casing and sampling, or wash boring.

The winch mast telescopes into place, allowing for flexible height options based on work environment. This also adds a layer of safety during setup when working near overhead power lines or other obstacles. 

Taller telescoping winch mast specifically designed for geotech work with heavier winch options, 105-inches head travel, and 36,000-lbf push and 48,000-lbf pull at the head-feed cylinder means greater pull back – ideal for drive and wash – and head travel. Allows tripping out of 20-foot lengths of rod when combined with 3-foot extension. 

Align the probe cylinder and tool string on a straight – or angled – path to the subsurface while the machine remains stable with the built-in oscillation, standard on all machines. 

Drill mast features extend, swing, mast dump, oscillation, and fold. Mast dump provides 36.5 inches of vertical travel to allow room for a mud pan. Outriggers let you quickly set up above the mud pan as well.
 

A dual winch option is typically configured with a 6,800-lbf winch for the more difficult pulling and an 1,800-lbf. with quick-change hook. When ready to switch from pulling to coring, simply swap out the swivel hook for the overshot clevis installed on your overshot and continue working. It’s quick, simple, and can all be done by hand.

Additional winch options include 2,500-lbf and 1,100-lbf. 

Also available is a third winch with 1,100 lbs of line pull, well suited to trip additional tooling out of the hole. Equipped with the Geoprobe^® exclusive quick change hook, operators can switch over to wireline coring in seconds. 
 

All functions are at your fingertips in a well-organized, compact control panel. The systems display provides real-time systems analysis and a suite of built-in diagnostic tools. Also included are system safeguards that protect the main engine and hydraulic components when important operational parameters are compromised.

Hands-free rotary and head feed controls on the 3100GT reduce strain on driller when completing applications like mud rotary. CPT feed rate and hydraulic limit functions are standard.
 

The 7-inch single breakout firmly grips casing with adjustable clamp force up to 21,000 lbs. The breakout can be positioned either under the hammer or the rotary drive, as well as swung away from the machine.

An optional Coring Upgrade Kit (217024) is also available to firmly grip thin-walled 2.75-inch OD casing without damage to the casing. The kit includes formed jaw pads and a circle wrench with carbide inserts.
 

Pump options for the 3100GT include the Moyno^® 3L6 or Moyno^® 3L8 pumps. The pump is controlled at the control panel with an on/off switch and the flow can be adjusted with a flow dial.

The storage holder connected to the breakout clamp is built for holding the anvil, wrench, and split spoon. The control panel has built-in trays and hooks for small storage.

Increased Payload Capacity Under CDL

With 22,000 lb GVWR, enjoy creature comforts of the fuel-sipping chassis with additional payload to haul tooling all while remaining under Class A/B CDL.

• TORQUE: higher torque 6-speed rotary head option adds 70% more torque compared to 4-speed
• PERCUSSION: GH63 percussion hammer
• FLEXIBILITY: third winch option with Geoprobe^® quick change hook 
• SPEED: trim time between applications with all head functions and winches along the centerline head side shift, eliminating need to move the drill mast and keeping driller out of harms way
• SAFE: reduce strain with hands-free auto drop hammer for SPT work and hands-free rotation and feed for rotary work
• EASY: promote new drillers quickly with easy operation
• POWER: create stable hydraulic flow for multiple functions simultaneously with a separate mud pump hydraulic circuit 

The GR6.5 rotary head has 6,800 ft-lbs of torque, which is 2,800 ft-lbs (70 percent) more than the GR4.1 on a typical 7822DT, without sacrificing top-end speed (720 rpm). It also has an additional intermediate-speed range, which further enhances the unit's wet and air rotary capabilities.

MWD (Measurement While Drilling) is a method of collecting digital data from the drill rig to log parameters pertaining to drilling operation. These methods are common in other parts of the world where it has been standard to log or measure drilling parameters in the oil, gas, and mining industries.

Starting in 2024, Geoprobe^® 31 series geotechnical drill rigs are MWD capable. The option can be added at any time to include an MWD kit allowing drilling parameters to be recorded

• Common parameters for MWD are crowd force, torque, penetration rate, mud pump pressure, mud flow rate, holdback pressure, head rotation speed and hole depth.
• Follows ISO 22476-15 International Standard for MWD.
• All sensors utilized are common Geoprobe^® components with proven experience and reliability.
• MWD sensors are easily integrated into existing rig electronics to maximize usefulness of sensor data being currently collected.
• Calibrated outputs are delivered to the data logger of your choice via J1939 CAN Bus network on the drill, simplifying the rig’s wiring.

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