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The Koror–Babeldaob Bridge is a bridge in Palau that connects Koror and Babeldaob Islands. It is a reinforced concrete, portal frame, cable-stayed bridge with a total length of 413 m. It was built by the Kajima Corporation of Japan in 2002, to replace the former, collapsed bridge built by Socio Construction Co. of Korea in 1978 and collapsed in 1996. ==The former KB Bridge== The original Koror–Babeldaob Bridge was a balanced cantilever prestressed concrete box girder bridge with a main span of 240.8 m and total length of 385.6 m (1265 ft). It was designed by Dyckerhoff & Widmann AG and Alfred A. Yee and Associates. It was constructed by Dyckerhoff & Widmann AG, contractor was Palau based〔(Socio Website ) ...Welcome to Socio's website. Socio is a construction and engineering firm located in Koror, Palau and operated under Surangel and Sons Co.〕〔(Locate and HeadQuarter of Surangel and Sons Company )〕 Korean company, Socio Construction Co.〔(A picture of the plate ) in Hangul and English which is recessed at the former KB Bridge.〕〔According to (Structurae database ), the bridge was completed in 1978. However, there are also sources which describe it as in 1977.〕 It was the world's largest bridge of its type,〔Troyano, L.F., "Bridge Engineering: A Global Perspective", Thomas Telford Publishing, 2003, p.426〕 until its record was broken by the 260 m span of the Gateway Bridge in Brisbane, Australia, finished in 1985. The middle hinge point of the bridge began to noticeably sag in the middle 10 years after its completion. This led to two studies carried out by Louis Berger International and the Japan international Co-operation Agency in 1990. They concluded that the bridge was "safe" as of now (in 100 year increments it will cave in 90 cm) and the large deflections were due to creep and the modulus of elasticity of the concrete in place being lower than anticipated.〔(The Collapse of the K-B Bridge in 1996 ) Matthias Pilz, Institut für Massivbau und Baustofftechnologie, Universität Leipzig〕 On September 26, 1996, after having reinforcement work were done, the bridge suddenly collapsed and shut off fresh water and electricity between the islands. In addition, the collapse killed two people and injured four more. This caused the government to declare a state of emergency. By request of Kuniwo Nakamura, then the country's President and foreign minister, Japan provided emergency aid as well as a temporary bridge.〔(Pontoon Type (Floating Structure with Flat Plates) bridge, Palau History; page 1 ) Britannica Online Encyclopedia〕 〔(Picture of the temporary bridge ) Stuffedwombat.com〕 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「Koror–Babeldaob Bridge」の詳細全文を読む スポンサード リンク
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