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The Schierstein Bridge (German: ''Schiersteiner Brücke'') is long, four-lane highway bridge in Germany. It carries Bundesautobahn 643 over the Rhine River between Mainz-Mombach, Rhineland-Palatinate and Wiesbaden-Schierstein, Hesse (Rhine kilometrage 504.45). Crossing two arms of the Rhine and the intervening island of Rettbergsaue, the bridge is made of six individual structures, including from prestressed concrete. It was built between 1959 to 1962. The Schierstein Bridge is located about downstream of the Theodor Heuss Bridge. Together with the Theodor Heuss Bridge and the A 60 bridge, it is one of three road bridges across the Rhine at Mainz. It is the last bridge over the Middle Rhine for downstream, before the Südbrücke in Koblenz. As of mid-February 2015 the bridge remains closed from all traffic due to structural damage. ==History== At the end of the 1950s and early 1960s, the states of Hesse and Rhineland-Palatinate began an extensive road construction program to further the development of the Rhine-Main Region. Planners recognized a need for a connection between the former Rhine-Main Expressway (''Rhein-Main Schnellweg'', now Bundesautobahn 66) on the right bank and Bundesstraße 9 (now Landstraße 419) on the left bank through a crossing of the Rhine north of Mainz. The bridge was also necessary to create a traffic ring in the Mainz-Wiesbaden area to better handle traffic coming from Frankfurt and Darmstadt. This ring, consisting of the A 643, A 66, A 671 and A 60, also included a second Rhine bridge south of Mainz. The selected route of the Schierstein Bridge required the crossing of five specific areas: the Schierstein floodplain, the Schierstein arm of the Rhine, Rettbergsaue Island, the Mombach arm of the Rhine, and the Mombach floodplain. The designers wanted to create one bridge with a uniform aesthetic design in spite of the diversity of different spans required to be constructed. In response to a free invitation, three designs were submitted to the official authorities. The designs included a steel construction with a lightweight steel deck, a composite concrete and steel construction, and a pre-stressed concrete design. Detailed investigations of the submissions showed the best solution was a combination of the three variants. The production of sub-units of the superstructure and their assembly into larger units were made in large part in the workshop. Large on-site cranes were then used to place them and their assembly was successfully completed. The entire steel structure was delivered to the site by water from Düsseldorf on a rented boat and installed.〔(History of the Construction of the Schiersteiner Bridge ), Ingenieurbauwerke in Hessen, FB Bauingenieurwesen, Universität Kassel. Retrieved on 2009-01-06.〕 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「Schierstein Bridge」の詳細全文を読む スポンサード リンク
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