The Gwangju-Songjeong ~ Suncheon Railway Construction Project aims to revitalize the economy of the Honam region and promote cultural tourism on the south coast by electrifying the only non-rail section of the Gyeongjeon Line (Gwangju-Suncheon), to expand high-speed rail services and establish a railway network between the Yeongnam and Honam regions. In particular, this project was called tender as a turnkey project due to the highly challenging design and construction of the section requiring a special bridge over the Yeongsan National River. CP-1 consists of a total of 6 bridges, including the 760m Yeongsan River crossing bridge, and has a total length of approximately 7.7km. BANDI was responsible for the design of the Yeongsan River Bridge, which is a special bridge. The outline of the this bridge is described below.

The bridge over the Yeongsan River required a minimum span of 80m or more according to the RFP and design standards, and for landscape and bridge safety reasons, the span configuration of the bridge over the Yeongsan River was designed as a 4x80 + 2x100 + 3x80 = 760m, 9-span hybrid arch bridge. The main span bridge was designed as a 100m span hybrid arch bridge using steel double arch ribs and concrete U-shaped girders, and the side spans were designed as an 80m span composite langer arch bridge using concrete arch ribs, concrete U-shaped girders, and boxed steel hangers.

The use of unique U-shaped concrete girders and steel double arch rib is more benefical in reducing noise and vibration than typical steel arch bridges, and results in a significant reduction in deflection caused by train loads.

The bridge over the Yeongsan River cannot be constructed for five months out of the year because construction is suspended during the rainy season. Therefore, the FSM (Full Staging Method) was used for the multi-span arch bridges, which can minimise the occupation period of the Yeongsan River with a fast erection. In addition, for the installation of the steel double arch rib, considering the lifting work on a temporary bridge, the entire arch rib was divided into three parts, and batch lifting was applied using two 300-tonne crawler cranes.

Two 3.0m diameter cast-in-place piles were used to minimise the occupation period and environmental damage to the Yeongsan River, and four 2.5m diameter cast-in-place piles were used for the 100m main span to increase the stiffness of the pile foundation. The multi-shaft cast-in-place pile foundation, which eliminated the need for enlarged foundations and a foundation cofferdam, minimised environmental damage to the Yeongsan River and enabled rapid construction.