  
B & H Engineering has provided construction support services to the New York City Department of Transportation for the rehabilitation of the Ninth Avenue Bridge. The project included the rehabilitation of two structures over the Transit Authority property, the first spanning the 38 Street Yard and the second spanning the Ninth Avenue Station. Both are five-span structures. The northern structure spans four railroad tracks inside the Transit Authority Yard, and consists of concrete-encased steel beams between two abutments and four piers. The southern structure spans three railroad tracks and two station platforms.
The construction support services included: the review of shop, erection, and electrical drawings including catalogue cuts, approach deck and slab reinforcement, contractor's proposed loading, protective shielding and temporary structures, survey data, field changes, concrete haunches tables; the investigation, analysis and preparation of responses to unanticipated field conditions; the clarification and furnishing of design intent of plans, specifications, and estimate; and the performance of interim inspections.
The project included the removal and replacement of the entire northern structure, and the rehabilitation of the southern structure. The work consisted of installation of new abutments, piles, retaining walls, concrete footings, steel column bents, new superstructure (steel stringers and concrete deck), new safety barriers, drainage, lighting; sign structures; replacement of sidewalk support steel and deck ; removal of hazardous waste; air and noise monitoring; MPT on bridges and local streets; coordination with Transit Authority; and the in-depth inspection the remaining structure.
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