The project is located in Yaodu District, Linfen City, Shanxi Province. The viaduct of Binhe West Road has two-way six lanes, with a bridge length of 1498.5 meters and a bridge width of 24.0 meters. The viaduct of planning No. 9 Road (Rainbow Bridge) has two-way four lanes, with a bridge length of 242.0 meters and a bridge width of 17.5 meters. The cross section of the steel box girder is a single box multi chamber open cross section: the outriggers on both sides are 2.55m, the standard beam spacing is 4m, the average height is 1.4m, and the thickness of the overlying concrete slab is 0.35m.