I'm looking for a rule of thumb for sizing a drop hammer using the FHWA Modified Gates Formula. One suggestion is to size the hammer so that the pile reaches the desired capacity at approximately 3 to 10 blows per inch. The project I'm working on requires a pile capacity of 142 kips, with a 4000 lb hammer and say a 5 ft drop the required blow count is 1 blow/in. Should I reduce the hammer size? or does this sound reasonable.
Due to the limited scope of the project, no PDA will be used.
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