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> View Specs

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.

> 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.

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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

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