Precast-Concrete Deck System Keeps New York Bridge Open

摘要

Portions of the deck of New York's Tappan Zee Bridge, a 3.1 mi (5 km) long steel and concrete structure that crosses the Hudson River at its widest point, are being replaced. Although the original deck derives stability from the fact that it is monolithic, the current: project involves the replacement of approximately 2 mi (3.2 km) of decking with 1,092 precast panels. As a result, the job requires precision and strength on a significant scale. The bridge was built after the Korean War, when controlling costs was of paramount importance, says Christopher A. Waite, p.e., the chief engineer at the New York State Thruway Authority.