Reconstruction of I-95 over West River & Bridge Replacement
New Haven & West Haven, CT
Connecticut Department of Transportation
This section of I-95 is one of the most heavily traveled in CT, carrying over 135,000 vehicles per day across the West River. Middlesex value engineered an innovative demolition and construction approach for the north bound span that combined eliminated 105 days of lane closure impacts.
The existing I-95 NB and SB twelve span bridges over the West River were replaced with two new five span structures. The new bridges will have a combined total width of 141 feet including three lanes each direction. The new structures are on a new alignment, new ramps were constructed or partially constructed to tie in to existing ramps. The exiting I-95 SB ramp to Kimberly Ave. was removed. The existing Ella T. Grasso Blvd bridge was replaced.
The as-bid phasing called for installing the new I-95 NB structure to the east of the existing and removing the existing bridge using conventional demolition methods under nightly lane closures with equipment placed on the new inservice structure and the exiting I-95 SB bridge.
Middlesex re-engineered the approach to remove entire bridge spans using gantries mounted on SMPTs. Spans were removed to the median area off the bridge for processing during the day. To eliminate lane closures need for steel erection, construction was re-engineered to launch the fully assembled spans from the median. Over 105 nights of lane closure impacts were eliminated in total.