Brooklyn Bridge Rehabilitation

In three separate projects Nab rehabilated the complete suspension system of the Brooklyn Bridge. We unwrapped, repaired re-wrapped, and re-tied all four of the 16-inch thick main cables.
In our first contract we spliced more than 1.000 broken steel wires in the anchorage pits, work that had never been done anywhere before.

Williamsburg Bridge

Nab’s project on the 1903 Williamsburg Bridge was to rebuild the BMT subway structure. In joint venture we installed 6,000 tons of steel - new box piers and stringers on the approach spans, new floor beams and stringers on the entire suspended span, and 300 bearings.
Earlier fast-track emergency repairs called for mobilizing over 100 ironworkers immediately upon award of contract and working seven days a week to complete repairs in eight weeks. We reopened the bridge two weeks early.

Flushing Line Viaduct

Nab reconstructed 4,200 feet of deteriorated viaduct on the second busiest subway line in New York. Working in joint venture, we removed and reconstructed track, track beds, and platforms; demolished and replaced the spandrel wall over sixty barrel arches, and rebuilt three passenger stations.
A 1995 Concrete Industry Board Award of Merit cited the project for “...extraordinary planning...innovative construction techniques...exquisite concrete reproduction work.”

Tappan Zee Bridge

When Nab rehabilitated the West Trestle Spans and the West Approach Pavement of the Tappan Zee Bridge, we worked on the bridge deck at night and kept all lanes of traffic open every day. Three crucial project components contributed to our meeting this schedule: we did daytime preparatory work from platforms suspended from the underside of the bridge; the owner specified precast Inverset deck panels, which support traffic immediately upon placement; and we used a straddle crane, typically found in boatyards, to remove and replace the deck panels.