Queensboro Bridge Inspection and Rehabilitationby Paul Nietzschmann, Steinman Boynton Gronquist &, Birdsall, New York, NY, USA,
Document Type: Proceeding Paper
Part of: Bridges and Transmission Line Structures
An in-depth inspection of the Queensboro Bridge revealed deterioration of certain elements on the lower level of the main bridge. These elements include the outer roadway cantilever brackets, the lower truss chords, the bottom lateral system, the lower roadway stringers, and the structural decks on the lower roadway anchor spans. Causes of corrosion and deterioration were found to be an inadequate drainage system, the use of deicing salts on the roadways, open expansion joints, construction joints in the deck over stringers, and accumulations of dirt and debris. Rehabilitation includes replacing the cantilever bracket tie angles, replacing lower chord lacing bars and tie plates, reinforcing the bottom laterals, replacing corroded stringers, and replacing the lower roadway decks. Measures to prevent future deterioration are given.
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