CME was chosen to be a major contributor for this complex interchange improvement project as a result of our extensive experience in Accelerated Bridge Construction and our reputation with innovative constructability. The project involved a complete realignment of the Interchange of Route 79 and I-195 in Fall River, Massachusetts. CME’s role on the project was to provide the design for two bridges (Anawan Street and Davol Street) and review of bridge demolition procedures for the entire project.
For the Anawan Street bridge, CME designed a short span structure where the superstructure depth was minimized to allow for the necessary vertical clearance for trains. Additionally, this project required the creation of a separate utility bridge and improvements to the substructure to meet current AASHTO Codes.
The existing structure carrying Davol Street and Route 79 were stacked on top of each other and the on the same alignment. Route 79 NB and SB were carried by a truss with NB bound carried on the top chord and SB carried on the bottom chord. Davol Street was a separate superstructure, carried below the truss structure with shared substructure elements. To complicate site constraints, all three structures spanned over a functioning railroad and were immediately adjacent to functioning businesses located in revitalized mill buildings. CME’s design created a six-span bridge carrying all three roadways at the same level with sidewalks and improved safety features.
CME served as one of several team members for this large project for MassDOT procured through the Design Build program. CME prepared the design of a single-span superstructure spanning an active railway and a six-span bridge to replace three structures carrying roadways over an active railroad and waterway.
The existing configuration of the single-span bridge (Anawan Street) involved two separate elements; a single-span bridge and an adjacent utility bridge. CME designed the replacements for both bridge structures and rehabilitated the existing masonry abutments by stabilizing them with deadman through the new reinforced bridge seats.
The six-span bridge project involved the replacement of three structures; the truss carrying Route 79 NB and SB and the Davol Street bridge located directly below the truss and on the same alignment. The proposed, simplified design brought three levels to one and was achieved on virtually the same alignment with widening to allow for two lanes in each direction. The new bridge accommodates Route 79 and Davol Street and connects with other city streets at new intersections constructed at grade.
To minimize disturbances on the active rail line, precast pier caps were implemented as part of the design process. This allowed for the construction of the pier columns outside the railroad envelope and erection of the U-shaped precast sections between the columns, eliminating the forming which is typically time and space consuming. Dapped beam ends were also employed where vertical underclearance needed to be maximized over the rail, but steel girder depth needed to be maintained at the piers for the proposed continuous design.
CME also provided a review of demolition plans to ensure the demolition contractor was compliant with the terms of the RFQ. It was a substantial effort involving 10 significant bridges and various walls and other structures.