The project involves the replacement of the superstructures (beams and concrete decks) of several bridges on Route 8/25 in Bridgeport approximately two miles north of Interstate 95. Also, included in the project is the rehabilitation of a large retaining wall supporting Route 8 and capacity improvements to two intersections on Lindley Street adjacent to Route 8 northbound.
The bridges are part of CTDOT’s Bridge Program which prioritizes work based on a continuous assessment of the remaining useful life of bridges and their need to be replaced or rehabilitated. As part of this program CTDOT has determined that the bridges involved are reaching the end of their useful life and warrant rehabilitation. This rehabilitation is necessary at this time to avoid excessive deterioration of the structure and to ensure a long and reliable life for the bridges in the future.
The CTDOT will utilize the Design-Build contract delivery method to decrease the time it takes to design and build the project. Accelerated Bridge Construction Techniques are also being utilized to reduce the time of construction and thus the impact of the project on road users and local citizens.
The accelerated technique being proposed is the use of prefabricated modular steel beam units that will be fabricated off site and installed rapidly during a short road closure. By using these techniques, the major portion of the project construction will be reduced from 2 years to one summer. The plan is to reduce the lane closure and stage construction periods that would impact the travel lanes on Route 8/25 from two years to two periods of approximately 14 days each.
A new method of contracting is being instituted for this project called “Design-Build”. This is a process that is different than typical projects for the CTDOT, where projects are designed by an engineering team, publicly bid and then built by a contractor.
In Design-Build contracting, a preliminary design is completed by the CTDOT, and then a public bid is held for the final design and construction of the project, by a Design-Build Team. This process saves time in the project development process and allows for innovation by the Design Build Team.