APE 170VM in Upstate NY
Reported From: APE Northeast (NJ)
The APE 170VM vibratory hammer was called to duty recently to extract sheets in a new sewage treatment plant in Liverpool NY.
The circular cofferdam was previously driven and a concrete tank formed and built inside of the excavation.
The desire to limit the vibrations generated when pulling the sheets came not from the new structure but from the old structures nearby that are still in service until the new plant comes on line.
Since a variable moment hammer starts and stops spinning while the eccentrics are phased out of time, no low end vibrations occur. The vibrations that are generated when the hammer starts and stops at lower frequency are the ones that generate the highest peak particle velocity (ppv).
The 170VM pulled all sheets while keeping the ppv below that maximum allowable.
