Senior Associate, Vicki Christini, PE spoke at this week’s AGC NYS Construction Industry Conference in Saratoga Springs, NY. Her presentation discussed engineering the accelerated bridge construction of LIRR’s Post Avenue Bridge using SPMT’s. The well-orchestrated Design-Build took precise timing and collaboration, replacing the live railroad bridge within a 48-hour span, minimizing Long Island’s service disruptions.
Throughout this meticulously planned weekend for this accelerated bridge construction project, the existing bridge superstructure was rolled out and the new superstructure was rolled into its new position via self-propelled modular transporters (SPMTs) from the adjacent parking lot. Crews from Halmar International, Inc. worked around the clock using a unique construction method with a remote-controlled lifting device. That transporter lifted the 103-year-old bridge, which remained intact after it was cut away from its connection to the abutments and placed into an adjacent parking lot. The contractor then had to modify the abutments to support the new bridge height. Then, the new bridge was lifted, in its entirety, and put into place over the roadway.