Connecticut’s Rapid Rehabilitation of US Route 1 Bridge over I-95

December 17, 2020 1:00 pm

Rabih Barakat, P.E., Principal Engineer, Connecticut Department of Transportation; Thomas Laliberte, P.E., Assistant Vice President/Connecticut Structures Lead, WSP USA; and George Gerard, P.E., Senior Structural Engineer, WSP USA

Winner of Best ABC Project Award in the Self-Propelled Modular Transporters Category (Highway Bridge) at the 2019 International ABC Conference!

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Featured Presentation: Connecticut’s Rapid Rehabilitation of US Route 1 Bridge over I-95 (35 Minutes)

Description: The 2019 superstructure replacement of the US Route 1 Bridge over I-95 in Stamford, Connecticut utilized self-propelled modular transporters (SPMTs) to replace the two-span, simply supported, heavily skewed (>54 degrees) superstructure during two 56-hour weekend closures of I-95. The bridge is located within a heavily congested interchange of I-95, where conventional staging for the superstructure replacement was not a viable option. The project replaced two superstructures, increased minimum vertical clearance, installed approach slabs, and rehabilitated the existing substructure. Bridge 00037 is one of the first projects in Connecticut to utilize SPMTs to perform a superstructure replacement. There were unique design considerations relative to existing site topography, superstructure geometry, deck tension, temporary supports, laydown areas, SPMT pick points relative to erection supports, and travel paths. This presentation will discuss the project history which resulted in the use of SPMTs, construction summary, and the unique design considerations associated with the utilization of SPMTs.

Presentation Photos/Graphics:

1) New superstructures were constructed on temporary support towers within the I-95 NB on/off ramps with minimal impact to vehicular traffic. I-95 was redirected around the bridge site through bypass ramp utilizing existing I-95 on/off ramps with limited construction of temporary pavement.

2) New superstructures were moved into place by self-propelled modular transporters during two 56-hour weekend closures of I-95.

3) Travel paths for transport of new superstructures were required to overcome infield area elevations varying from final locations and full super elevation of I-95 within project limits.

4) Traffic was returned to I-95 and U.S. Route 1 early for both weekend closures, with overall construction completed two months ahead of schedule.

5) A minimum vertical clearance over I-95 of 16’-8” was obtained through use of higher strength steel; steel bolsters were utilized to tie into original bridge elevations.

6) The original substructure remained in place with rehabilitation performed as needed to repair deterioration.

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