Abstract
This paper discusses a bridge reconstruction project that included a most unusual repair of two main river piers. The bridge, built in 1935, is owned by Broome County, N.Y. and is located in the village of Windsor. It provides a two-lane highway crossing over the Susquehanna River. In the early 1980s, the piers exhibited spalling, cracking, and efflorescence indicating surface deterioration on the 2.13 m (7 ft) thick shafts that was confirmed by hammer sounding. Routine surface preparation for shotcrete repairs discovered deteriorated concrete at depths of up to 610 mm (24 in.). Hence, the construction was halted until more intensive examination and investigation could establish a different approach. The adopted solution was the installation of a new concrete shell around the perimeter of the piers with through-shaft posttensioning to clamp the shell to the shaft. The design was prepared to accommodate various stages of deterioration of the existing piers. Through-shaft posttensioning is considered rare (if not unique) in the United States. Many unusual issues and forces were confronted during the design and detailing process.
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