Geobukseon bridge

Geobukseon Bridge (Second Dolsan Bridge)
Geobukseon Bridge, South Korea
Carries	4 lanes of motor vehicles
Crosses	South Sea of Korea
Locale	Yeosu, South Korea
Characteristics
Design	Cable-stayed
Material	Concrete
Total length	approach 280 metres (920 ft) main 464 metres (1,522 ft)
Width	23.9 metres (78 ft)
Clearance below	22.0 metres (72.2 ft)
History
Contracted lead designer	Daelim Industrial and Yooshin Engineering Corporation
Constructed by	Daelim Industrial
Construction start	2008
Construction end	2012
Construction cost	$60 million USD (including 460 metres (1,510 ft) approach tunnel
Opened	2012
References

The Geobukseon Bridge (Hangul: 거북선대교), also called the Second Dolsan Bridge (Hangul: 제2돌산대교), is the main bridge on the Yeosu Road between Udu-ri, Dolsan-eup and Jonghwa-dong, linking the Yeosu Port with Dolsan Island across the South Sea of Korea. 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 and carries four lanes of motor vehicle traffic. 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 built 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.

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.