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Geobukseon bridge
The Geobukseon Bridge (also called the Second Dolsan Bridge) is the main bridge on the Yeosu Road between Woodoo-Ri and Jonghwa-Dong, linking the Yeosu Port with Dolsan Island across the South Sea of Korea.〔"Second Dolsan Bridge : A Cable-Stayed Bridge with a Concrete Edge Girder", SEI Volume 22, Number 1, February 2012〕 The bridge is floating cable-stayed bridge with 464m (35+82+230+82+35m) length and its construction started in June 2008. It opened in April 2012. The new link was intended to reduce traffic congestion on the First Dolsan Bridge which opened in 1985, and act as an important infra-structure link during the Yeosu Expo which had been held from May, 2012 for three months. The bridge was being by contractor Daelim Industrial Co. Ltd for client Iksan Regional Construction & Management Administration. Contract cost is US$60million, which includes a 460m long tunnel at one end, and a 280m long approach bridge.〔“Report : Second site”, Bridge Design & Engineering, Issue No.56, Third Quarter 2009, Page 34~35〕
==Construction==
The caisson and cast-in-place concrete piles were used for the foundation of PY1 and PY2 respectively. For the foundation of PY1, two small caissons were chosen. A 1,300 ton floating crane was used to install the caisson foundations, which was cheaper and did not interfere with shipping at the site. Cast-in-place concrete piles were chosen for PY2 because the shallow depth of just 3.9m restricted access by the floating crane.
Construction of the pylon legs was carried out using automatic climbing system formwork, in lifts varying from 3m to 4m height. Each segment took about seven days to complete. When the climbing form reached a height of 72.9m, the concrete edge girder was installed by the form traveller supported by permanent stays was chosen – this self-launching system is designed for in situ casting of the segment using the free cantilever method.
MS type was chosen due to an competitiveness in the bidding. The accessory of cables were supplied by VSL and installed with a mono strand jack using strand by strand installation method. Strand installation and stressing shall be carried out after installation of HDPE stay pipe. They are stressed from the upper end in the tower, where the concentration of anchorages makes the process more efficient. At the lower end, the cable is anchored below the edge girder.〔"A cable bridge : The Geobukseon Bridge" Korea bridge technology 2012, page 51〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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