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South Korean link edges towards completion

South Korea’s Bujan-Geoje fixed link reached a major milestone this week with the completion of two bridge decks and a tunnel section (NCE 13 January 2009).

Main contractor Daewoo Engineering and Construction lifted the final bridge deck segments on the 672m long, three span cable-stayed bridge and the 915m long, two span cable-stayed bridge, which form part of the link.

The contractor also installed the final section of the 3.3km long immersed tunnel. This means just 1.4m - a joint at the end of the tunnel - remains to be finished on the total 8.3km stretch.

Danish consultant Cowi designed the $2.6bn (£1.78bn) project. It will connect South Korea’s second largest city
Busan with the island of Geoje and is due to be opened at the end of the year.

At a maximum depth of 46m deep, the tunnel is made up of 18 segments measuring 180m long, 26.5m wide and 10m high. Segments were constructed in a dry dock built for the project then moored into position.

A Cowi engineer said the foundation works for the tunnel proved to be very “difficult” causing a delay of about half a year. However Danish sub-contractor Strukton successfully placed the tunnel sections on a levelled gravel seabed in exposed open sea conditions.

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