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.
Features & Options
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.
Click below to view standard specifications. Specifications are subject to change without notice.
|Weight (hammer only - ASTM D1586)||140 lb.||64 kg|
|Weight (hammer unit)||470 lb.||213 kg|
|Height||63 in.||1,600 mm|
|Width||20 in.||508 mm|
|Depth||14.5 in.||368 mm|
|Cabinet Float/Travel Distance||31 in.||787 mm|
|Percussion Rate||60 blows per minute|
|Hydraulic Flow Rate||13 gpm||49 Lpm|
|Hydraulic Pressure Rating||2,500 psi||172 bar|
Click on a section below to view information.