I-84 Bridges over Marion Avenue
A two-bridge project in Southington, Connecticut, took advantage of precast concrete and Accelerated Bridge Construction (ABC) techniques to minimize construction time and reduce user costs for detours by reducing closure time on the bridge to less than 56 hours.
The twin east- and westbound bridges, on Interstate 84 over Marion Avenue, replace 1963 structures and features 47-inch-deep precast concrete PCEF bulb-tee girders approximately 102.5 feet long. The NEBT 1200 beams were fabricated in the plant by Northeast Prestressed Products and delivered to a staging area near the bridge. The project was designed by the Connecticut Department of Transportation.
Once the components were in place, the highway beneath the bridges was closed for a weekend. The existing bridges were demolished and removed, and the new superstructures was moved into place using Self-Propelled Modular Transports (SPMTs). To help speed construction, NPP also provided precast concrete approach slabs, which were redesigned to provide larger slabs resulting in fewer closure joints.
Bridge Design Engineer:
Precast Beam Design:
Structural Precast Elements:
• Approach slabs
• Section moved into place using SPMTs
• 56-hour closure of highway to complete project