The Walsh/PCL Joint Venture in Connecticut on the Pearl Harbor Memorial Bridge replacement project came to APE with a dilemma. They needed to install a work trestle using 24″ open ended pipe piles, some of which have to be driven underneath the existing bridge structure.

APE came up with a system that includes an APE Tandem 150 vibro that allows the piles to extend thru a centerhole clamp and above the height of the hammer to maximize headroom. Then the piles are impacted in to capacity with an APE D62-42 diesel hammer in a specially built short section of leads.

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