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DH-Series
Automatic Drop Hammer

Geoprobe® 3100GT

Geoprobe® 3100GT

Geoprobe® 150GT

Geoprobe® 150GT

Geoprobe® 7822DT

Geoprobe® 7822DT

Geoprobe® 3230DT

Geoprobe® 3230DT

Geoprobe® 8150LS

Geoprobe® 8150LS

Geoprobe® 3100GT
Geoprobe® 150GT
Geoprobe® 7822DT
Geoprobe® 3230DT
Geoprobe® 8150LS

The days when you had to choose a machine based on whether you wanted to do environmental or geotechnical work are fading fast. Now you can do both.

Need SPT blow counts for your customer? Use a Geoprobe® DH-Series Automatic Drop Hammer with your hollow stem augers or with the specially designed dual tube system by Geoprobe Systems®. Going to a job where you won't need the automatic hammer? No problem. A couple of minutes is all it takes to remove it from your machine, or you can swing and secure the drop hammer away from your work spaces.

❯ Contact Us

> View Specs

DH-Series
Automatic Drop Hammer


The days when you had to choose a machine based on whether you wanted to do environmental or geotechnical work are fading fast. Now you can do both.

Need SPT blow counts for your customer? Use a Geoprobe® DH-Series Automatic Drop Hammer with your hollow stem augers or with the specially designed dual tube system by Geoprobe Systems®. Going to a job where you won't need the automatic hammer? No problem. A couple of minutes is all it takes to remove it from your machine, or you can swing and secure the drop hammer away from your work spaces.

❯ Contact Us

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Features & Options

Automatic Drop Hammer

Automatic Drop Hammer

    • Easy on / Easy off design!
    • Conforms to ASTM Standards D1586-99.
    • Operates from auxiliary hydraulics.
    • Consistent results with no human error.
    • No cables or ropes needed for operation.
    • All moving hammer components are enclosed for operator safety.
    • Hammer swings over hollow stem augers... no need to reposition the whole machine.
    • Operates at up to 60 blows per minute.
    • Throw height can be adjusted within seconds.
    • Use your Geoprobe® track machine for both environmental AND geotechnical projects.
    • Used to perform Standard Penetration Test (SPT) which is the most common in situ geotechnical test in the U.S.
    • SPT blow count results are used by engineers for obtaining strength and density properties of soil, designing foundations, and defining earthquake sensitive soils.
    • Use the Geoprobe® SPT dual tube system with the automatic hammer for SPT testing.

Applications

The Geoprobe® DH-Series Automatic Drop Hammers are an effective tool to collect Standard Penetration Test (SPT) blow counts with your Geoprobe® machine.

SPT BLOW COUNT consists of:

  • Using a 140 lb. (64 kg) driving mass falling free from a height of 30 in. (762 mm)...
  • Driving the standard split spoon sampler a distance of 18 in. (457 mm) into the soil, and...
  • Counting the number of blows (N) to drive the sampler 12 in. (6 in. plus 6 in.) [152 mm plus 152 mm].

The hammer is powered through the auxiliary hydraulics on 66 and 77 Series Machines and is lifted into position using the probing cylinder. The inconsistency that has historically been a problem for the SPT test is minimized with the repeatable, accurate function of this hammer. The 140-pound weight has a 30-inch free fall before making contact with the anvil so every test is performed the same. And safety was a prime consideration during the development of this tool, so all moving parts and impact surfaces are enclosed in a steel housing.

Videos


Features & Options

Tooling & Sampling

Specifications

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

General Specifications
StandardMetric
Weight (hammer only - ASTM D1586)140 lb.64 kg
Weight (hammer unit)470 lb.213 kg
Height63 in.1,600 mm
Width20 in.508 mm
Depth14.5 in.368 mm
Cabinet Float/Travel Distance31 in.787 mm
Percussion Rate60 blows per minute
Hydraulic Flow Rate13 gpm49 Lpm
Hydraulic Pressure Rating2,500 psi172 bar

Resources

Click on a section below to view information.

Geoprobe® 3100GT

Geoprobe® 3100GT

Geoprobe® 150GT

Geoprobe® 150GT

Geoprobe® 7822DT

Geoprobe® 7822DT

Geoprobe® 3230DT

Geoprobe® 3230DT

Geoprobe® 8150LS

Geoprobe® 8150LS

Automatic Drop Hammer

Automatic Drop Hammer

Geoprobe® Machines

We engineer and manufacturer machines for environmental, geotechnical, exploration, CPT, geothermal, and water well applications. Below you will find more information on all of our rigs. Click on them for more information.

Rotary Sonic
8250LS

❯ 8250LS
Rotary Sonic Drill Rig

The Geoprobe® 8250LS is a full-size rotary sonic rig capable of running 20-ft. tooling. The GV5 sonic head provides 50,000 lbs. of dynamic force for increased efficiency in the field.

Geotechnical, Environmental, Exploration and Geothermal

Rotary Sonic
8150LS

❯ 8150LS
Rotary Sonic Drill Rig

The Geoprobe® 8150LS is a full-size rotary sonic rig with high performance. It is capable of running 10 ft. tooling and the GV5 sonic head provides 50,000 lbs. of dynamic force.

Geotechnical, Environmental, Exploration and Geothermal

Direct Push & Rotary
3230DT

❯ 3230DT
Environmental & Geotechnical Drill Rig

The Geoprobe® 3230DT is ideal for geotechnical and environmental applications. The high-speed drill head easily turns augers, while the automatic drop hammer is equipped for SPT work.

Geotechnical, Environmental, Exploration and CPT

Direct Push & Rotary
7822DT

❯ 7822DT
Environmental & Geotechnical Drill Rig

The Geoprobe® 7822DT is a high-capacity direct push machine with a narrow platform. Applications include soil sampling, rock coring, groundwater monitoring, geotechnical and more.

Geotechnical, Environmental, Exploration and CPT

Direct Push & Rotary
6712DT

❯ 6712DT
Direct Push Machine

Modular drilling rig perfect for small- to medium-sized direct push projects. It breaks into three components if necessary for easy transport to remote sites.

Geotechnical, Environmental, Exploration and CPT

Geotechnical
3100GT

❯ 3100GT
Geotechnical Drill Rig

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.

Geotechnical, Environmental and CPT

Geotechnical
150GT

❯ 150GT
Geotechnical Drill Rig

Specifically designed for customers focused on traditional geotechnical drilling applications utilizing: hollow stem auger, solid stem auger, SPT, mud rotary, air rotary, and high speed coring.

Geotechnical and Environmental

CPT
20 CPT Press Mounted on a Skid Steer

❯ 20CPT Press
Cone Penetration Testing

This flexible mast option with a 20-ton capacity is specifically designed for performing CPT. It’s versatile too, with a quick mount design that allows the CPT mast to be attached to multiple platforms (skid steer, 6712DT).

Geotechnical and CPT

CPT
2060CPT

❯ 2060CPT
Cone Penetration Testing

The Geoprobe® 2060CPT is a 20 ton cabin crawler used for Cone Penetration Testing (CPT). It includes many user-friendly controls to make jobs in the field quick, efficient, and comfortable.

Geotechnical and CPT

Limited Access
5410

❯ 5410
Direct Push Machine

54-in. stroke and 28,900 lb. of pulling capacity for subsurface work. Lateral movement of the unit provides for offset placement of the probe without moving the carrier vehicle.

Environmental

Limited Access
54LT

❯ 54LT
Direct Push Machine

Rugged, compact probing unit designed for tight spaces and rough terrain. This unit is narrow enough to fit through standard 36-in. doors to get to confined, enclosed places.

Environmental

Limited Access
540MT

❯ 540MT
Direct Push Machine

Ready for confined spaces and low ceilings with reliable Geoprobe® power. When folded, the unit is less than 29 inches (737 mm) high.

Environmental

Limited Access
420M

❯ 420M
Direct Push Machine

At 23 in. wide, 62 in. tall (folded), and weighing less than 425 lb., the 420M can be manually lifted and carried to remote sampling locations.

Environmental

Water Well
DM250 Water Well Rig

❯ DM250
Water Well Rig

The DRILLMAX® DM250 Water Well Rig is the only rig mounted on a truck under CDL requirements that can handle 20-ft. drill pipe. The perfect rig for 2-in. -6-in. shallow water wells.

Geothermal and Water Well

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