This bridge links Yeongjong (Yong Chong) Island, the site of Seoul’s new international airport, to the mainland. It carries six lanes of traffic at top deck level, and a further four lanes of traffic and two rail lines on the lower deck. Spans are 125m long, articulated in 3 span modules. The deck structure is a very heavy Warren truss, 12m deep, the deck width being 36m. There is approximately 6,500 tonnes of steel in each span. Hanjin Engineering and Construction Co Ltd was responsible for fabricating and erecting over half the total viaduct length, most of which is over water. Erection conditions were hampered by strong tides and a very large tidal range.
Tony Gee was retained to develop the erection scheme in conjunction with Hanjin’s staff, design all the elements of temporary works, establish a site QA/QC team, give detailed advice on the welding and other fabrication problems associated with this complex bridge and carry out a complete independent check of the bridge deck structure.