Collect Standard Penetration Test (SPT) blow counts
• Easy on / Easy off design!
• Conforms to ASTM Standards D1586-99. • Consistent results with no human error. • No cables or ropes needed for operation. • Hammer cannot be"dry fired" (must be on a rod string) or fired in the horizontal position for operator safety. • Hammer swings over hollow stem augers...no need to reposition the whole machine. • 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. Drop Hammer Operation • Powered from auxiliary hydraulics on the probing machine • Drops 140 pound (64 kg) weight 30 inches (762 mm) • 60 blows per minute driving rate • Accurate, repeatable results • The anvil impact surface and all moving parts are enclosed for safety • Easy on and off requires one pin to be pulled — no bolts to keep track of • Hammer can be mounted or detached within minutes using the probe machine's winch • Hammer can safely be stored upright on storage base for small footprint and easy access Automatic Drop Hammer Specifications Weight (hammer only - ASTM D1586) 140 lb 63.5 kg Weight (hammer unit) 470 lb 213 kg Height (transport) 63 in 1,600 m Width (transport) 20 in 508 mm Depth (transport) 14.5 in 368 mm Cabinet Float/Travel Distance 31 in 787 mm Maximum Percussion Rate 60 blows per minute Hydraulic Flow Rate 13 gpm 50 Lpm Hydraulic Pressure Rating 2,500 psi 172 bar