Features & Options
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.
Specifications
Click below to view standard specifications. Specifications are subject to change without notice.
Standard | Metric | ||
---|---|---|---|
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 |
Resources
Click on a section below to view information.
DH-Series Auto Drop Hammer Product Sheet |






.
.