Collins was the prime consultant providing engineering services for the bridge preservation of both the Market Street and Everett Street Bridges over I-90, the CSX/MBTA Railroad, and local roads in Boston, Massachusetts, as part of the MassDOT Statewide Bridge Preservation/Betterment Program.
The work consisted of preserving the existing superstructure and substructure, including power washing the entire bridge (superstructure and substructure), replacing deck joints in-kind, repairing deteriorated steel beam ends, painting steel members, replacing one abutment beam seat (included hydraulic jacking of span), repairing substructure spalls, cracks and deterioration, sealing substructure components, complete stone pointing at masonry abutment and wingwalls ends, and replacing lighting standard bases. The railroad and road below were protected from debris by using temporary shielding during construction.
Collins’ scope of work included the preparation of plans, special provisions, and cost estimates. Due to the high average daily traffic (ADT) on Market and Everett Streets, I-90 and the restrictions from the railroad below, accelerated bridge construction (ABC) techniques were incorporated wherever possible to minimize construction duration and impacts to traffic. Services also included the development of traffic management plans and construction phase services completed in accordance with MassDOT’s Bridge Program and Bridge Manual. Collins was sensitive to project constraints, including construction schedule, construction costs, vertical under-clearances, environmental considerations, aesthetics, historical contexts, and traffic management. Coordination with CSX Railroad and the MBTA was required for access to railroad spans. Collins also prepared an as-built rating report for the bridge in conformance with the Bridge Manual, Chapter 7, after the bridge work was completed, inspected by MassDOT, and opened to traffic.