Dynamic Pile Testing - piledrivers.org
7 Net measured energy transfer (steel piles) 0% 20% 40% 60% 80% 100% 20% cabled drop hammers 80% 30% diesel hammers 60% 40% air hammers 70% 60% hydraulic drop hammers 100% Efficiencies on concrete piles are lower ~ 10% Hammer Performance
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