National Parks Service developed a phased plan to revitalize the concrete approach ramps, replace the drawbridge span and concrete deck completely. Concrete Technology Services Mid-Atlantic was hired to assist in engineering a plan to saw cut the concrete deck and framing sections in a system that would allow Kiewit Infrastructure Co. to crane lift each component in a timed sequence while keeping the bridge operational for daily commuter traffic.

CTS plan consisted of two phases, the first included saw cutting the back side of the 144 90′ wall sections so that vehicular traffic could continue without a lane closure. This made it possible to complete 50% of the wall sawing prior to the scheduled bridge shut down. The deck was then cut with a custom made 72″ slab saw that created 32″ deep cuts in the robust deck and beam structure that was originally planned to be cut with wire saws. Pre-cutting the deck sections into 8′ x 8′ squares also allowed for construction traffic to continue to utilize the deck prior to removal at the GC’s convenience. This created a major opportunity for CTS, Kiewit and the client to save time and money.

The method developed by CTS and Kiewit also drastically reduced noise pollution while being the most environmentally friendly solution versus the conventional demolition plan of using large excavators with hydraulic breaking hammers that would inevitably send dust and debris into the Potomac River.