Our Experience

Transportation Engineering

Transportation Project Experience

New Tappan Zee Bridge

Between Nyack and Tarrytown, NY over the Hudson River

Tappan Zee Constructors, LLC

Tappan Zee Constructors, LLC

Unistress Corp.

As precast specialty engineer, designed lifting, handling, hauling and storage schemes and produced the shop drawings for the for full-depth deck panels for all approach spans. This was an extremely large, fast-paced project, requiring more than 12 full-time detailers and engineers for many months. Many panels were bi-planar to accommodate variable roadway crown lines. Detailing four levels of rebar around numerous penetrations, embedments, and build-outs proved to be a continuous challenge throughout the duration of the project. The 100-year service life of the structure required extraordinary drafting precision and close attention to detail.

  • Structure length: Twin structures, 2.5 miles long each
  • Total project cost: $4.0 billion
  • Number of deck panels on approach spans: 5,960
  • Full-size panel dimensions: 45' wide x 12' long x 11" thick
  • Full-size panel weight: 74,000 lbs.
  • Mark numbers: 1,300
  • Drawing sheets: 3,000

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