|
These pontoon bridges are semi-permanent floating bridges located throughout the world. Four of the five longest floating bridges in the world are in Washington State. * Admiral Clarey Bridge * Bergøysund Floating Bridge * Demerara Harbour Bridge * Dongjin Bridge * Eastbank Esplanade * Governor Albert D. Rosellini Bridge—Evergreen Point also known as the Evergreen Point Floating Bridge * Floating Bridge, Dubai * Galata Bridge * Guangji Bridge (disambiguation) * Hobart Bridge * Hood Canal Bridge * Howrah Bridge * Interstate 90 floating bridge, near Seattle, consisting of two spans: * *Lacey V. Murrow Memorial Bridge, which carries eastbound I-90 * *Homer M. Hadley Memorial Bridge, which carries westbound I-90 and its carpool lanes. * Nordhordland Bridge * Queen Emma Bridge * Sozh Floating Bridge * Sunset Lake Floating Bridge, Vermont * William R. Bennett Bridge (replaced Okanagan Lake Bridge) * Governor Albert D. Rosellini Bridge — Evergreen Point * * Completed 1963. Span . * * Spans Lake Washington in Washington State, carrying State Route 520 from Seattle to Medina. A toll bridge until 1979, its common name is the 520 bridge or Evergreen Point Floating Bridge. It is the longest floating bridge in the world. * * Currently, the Evergreen Point Floating Bridge is once again being tolled; because of the age of the bridge and its likelihood of withstanding wind speeds over , it is planned to be replaced by a new floating bridge in 2016. Toll revenues are expected to cover approximately one-third of the estimated 4.65 billion dollar replacement cost. * Lacey V. Murrow Memorial Bridge * * Original bridge completed in 1940 but sank in 1990 because of weather and mishaps in maintenance. * * Second bridge completed 1993. Span . * * Spans Lake Washington in Washington State, carrying Interstate 90 traffic eastbound from Seattle to Mercer Island. A toll bridge until 1946, its common name is the I-90 bridge or Lake Washington Floating Bridge. It was the first floating bridge longer than a mile, and at the time was the longest floating structure in the world. It is now the second longest floating bridge in the world. * Hood Canal Bridge * * Completed 1961. Span . * * Carries State Route 104 across Hood Canal in Washington state. It is the third longest floating bridge in the world. * * This bridge broke apart in the February 13, 1979 windstorm. It was rebuilt 3 years later. * Demerara Harbour Bridge * * Completed 1978. Span . * * Located immediately south of Georgetown, Guyana, it is constructed with steel pontoon units and is the fourth longest floating bridge in the world. * Homer M. Hadley Memorial Bridge * * Completed 1989. Span . * * Spans Lake Washington in Washington state, carrying Interstate 90 traffic westbound from Mercer Island to Seattle. It runs parallel to the Lacey V. Murrow Memorial Bridge, which carries eastbound Interstate 90 Traffic, and is also commonly referred to as the I-90 bridge or Lake Washington Floating Bridge. It is the fifth longest floating bridge in the world. * Berbice Bridge * * Completed 2008. Span . * * Located near New Amsterdam in Guyana. * Nordhordland Bridge * * Completed 1994. Span (the floating bridge part). * * Located near Bergen, Norway, the Nordhordland Bridge consists of a free-floating bridge and a high level cable-stayed bridge. The free-floating bridge has the longest laterally-unsupported span in the world. It is sometimes referred to as the Salhus Bridge. * * (Architect's web site ) * Bergøysund Floating Bridge * * Completed 1992. Span . * * Located in Kristiansund, Norway. * Galata Bridge * * Completed 1875. Span . * * Decommissioned 1992. * * This floating bridge crossed the Golden Horn in Turkey. After it was damaged by a 1992 fire, it was towed up the Golden Horn to make way for the fifth and current Galata Bridge, a bascule bridge. * Howrah Bridge * * Completed 1874. * * Decommissioned 1943 * * This bridge, connected Howrah and Calcutta on opposite banks of Hooghly River, was built using timber on pontoon and was opened to let river traffic through. * Okanagan Lake Bridge * * Completed 1958. Span . * * Spans Okanagan Lake in British Columbia, carrying Highway 97 to Kelowna. This was the first floating bridge built in Canada. The old 3 lane floating bridge has been replaced by a new, 5 lane floating bridge. The new bridge — William R. Bennett Bridge — was completed on May 25, 2008. * Dongjin Bridge in Ganzhou, China * * Pontoon bridges have been constructed over the Zhang and Gong rivers since the Song Dynasty (960-1279). * * One of the bridges, the Dongjin Bridge, can still be seen. * * It is 400 metres long, made up of wooden planks placed on around 100 wooden boats linked together with iron chains. * Eastbank Esplanade * * Completed 2001. Span . * * Located in Portland, Oregon, it is the longest floating pedestrian bridge in the United States. * Hobart Bridge * * Completed 1943. Span * * Spanned the Derwent River at Hobart, Tasmania * * Constructed of hollow concrete pontoons, it was replaced by a new bridge in 1964 * Queen Emma Bridge * * A pontoon bridge from Punda to Otrabanda across the harbor of Willemstad on the island of Curaçao. Notable because this permanent bridge is hinged and opens regularly to enable the passage of oceangoing vessels. * * Span * Sunset Lake Floating Bridge * * Located in Brookfield, Vermont * * Built on logs in 1820, then upon tarred barrels in 1884, rebuilt using plastic barrels filled with styrofoam in 1978, carries light automobile traffic. * Sozh Floating Bridge * * The new floating bridge replaced an older one and spanned the Sozh River at Korma, Belarus * * Built in 2003/2004, carries light automobile traffic. * Floating Bridge, Dubai, United Arab Emirates * * A new floating bridge has been erected over Dubai Creek to ease traffic on over creek crossings in Dubai (United Arab Emirates) * * The bridge opened to the public on 16 July 2007; two weeks after applying the Salik road toll to the Al Garhoud Bridge. * Guangji Bridge (Chaozhou), China == References == 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「List of pontoon bridges」の詳細全文を読む スポンサード リンク
|