As a subconsultant, SI Engineering, P.C. (SIE) provided construction inspection and electrical design oversight services for the rehabilitation of Spans 3 through 7 at the Cross Bay Bridge, as well as miscellaneous repairs at the Marine Parkway Bridge.
The scope of work involved strengthening / reinforcing the structural elements in Spans 3 through 7 to support the HS-25 loading and make the necessary repairs to any deteriorated elements as needed, as well as installation of a structural support system to provide redundant support for the CBB Drop-In Span, which included designing and installing a structural support system to the existing CBB superstructure to provide a redundant support system for the drop-in span at the existing girder corbels. Additional work consisted of structural repairs to the girders at CBB ramps, including the removal of existing deteriorated concrete and reinforcement and replacement with new reinforcement and high strength concrete, as well as complete removal of the existing south pedestrian ramp leading up to the walkway and construction of a new pedestrian ramp compliant with AASHTO and ADA requirements. Other tasks included installation and monitoring of Structural Health Monitoring/Weigh-In-Motion (SHM/WIM) equipment on both the CBB and MPB in both directions to monitor the weights of trucks using the bridges and the behavior of the structural elements. The scope also involved installation of prototype aluminum grid deck panels at MPB to monitor performance and structural durability under live loads. Miscellaneous Repairs at both the MPB and CBB involve various structural elements found on both bridges, including but not limited to the piers, abutments, girders, decks, bearings, steel trusses, railings, barriers and conduits.
