Geoprobe Systems
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    Geoprobe Systems
    Geoprobe Systems
    785-825-1842 001-785-825-1842 785-825-1842 001-785-825-1842
    > 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

    Geoprobe® Automatic Drop Hammer Overview


    ID: 17742

    Tooling & Sampling

    Collecting Split Spoon Samples

    > Learn More
    ID: 10616

    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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