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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

> 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.

❯ Contact Us

Features & Options

- 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

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ID: 10616

Specifications

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

General Specifications


	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.

Angle drilling and the rod handling system show the capabilities of the 8150LS sonic.

Geoprobe® Sonic Broadens M&W Drilling’s Services

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New Electro Kinetic Remediation Technology Used in New York

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DH-Series Auto Drop Hammer Product Sheet

Literature Type: Product Sheets
Download File: Especs 2017 DH-Series Automatic Drop Hammers.pdf

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 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 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 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 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 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 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 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 ❯ 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 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 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 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 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 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 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