The Challenge

  • I-84 bridges over Marion Avenue, CT, rated 4 for superstructure condition
  • Replace existing structure with new, minimizing road closure

The two bridges carried I-84 eastbound & westbound over Marion Avenue, Southington, CT. On a scale of zero to nine, both bridges received a superstructure rating of 4. This was due to diagonal cracks as well as exposed reinforcement and tendons. In order to replace these superstructures, Self Propelled Motorized Transporter (SPMT) platform vehicles were used to lift out the existing structures and set the new structures. This procedure took place over 56 hours, minimizing road closure of I-84 and related public disruptions.