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The Penobscot Narrows Bridge is a long cable-stayed bridge that carries US 1/SR 3 over the Penobscot River. It connects Verona Island to Prospect, in the U.S. state of Maine. It replaced the Waldo–Hancock Bridge, built in 1931. == Technical information == The Penobscot Narrows Bridge is one of three bridges in the US (the others being Zakim Bridge in Boston, Massachusetts, and Veterans' Glass City Skyway in Toledo, Ohio) constructed recently to utilize a cradle system that carries the strands within the stays from bridge deck to bridge deck, as a continuous element, eliminating anchorages in the pylons.〔 (【引用サイトリンク】title= Penobscot Narrows Bridge, Maine )〕 Each epoxy-coated steel strand is carried inside the cradle in a one-inch steel tube. Each strand acts independently, allowing for removal, inspection and replacement of individual strands. The cable-stay system was designed with a system that uses pressurized nitrogen gas to defend against corrosion. In June 2007, six reference strands within three stays were replaced with carbon fiber strands – a first in the US. Monitoring on the strands will evaluate this material for future use in bridge designs. These engineering innovations helped the bridge appear in the December 2006 edition of ''Popular Science'' as one of the 100 best innovations of the year.〔 (【引用サイトリンク】title= PopSci's Best of What's New 2006 )〕 The total project cost was $85 million. The bridge was designed as an emergency replacement for the Waldo–Hancock Bridge. From conception to completion, just 42 months elapsed. A unique project delivery method, referred to as "owner facilitated design/build" partnered Maine DOT with FIGG as the designer and Cianbro/Reed & Reed LLC as the contractor. The elevator system in the tower, which is claimed to be the fastest and tallest elevator in Maine,〔http://www.maine.gov/mdot/pnbo/faq.htm〕 was installed by Stanley Elevator Company, Inc. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Penobscot Narrows Bridge and Observatory」の詳細全文を読む スポンサード リンク
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