U-Concept Viaduct - Precast Segmental Application to UIJEONGBU LRT Project (South Korea)

Uijeongbu City, a major satellite town at the northern outskirts of Seoul, features the first application of U-shape structure design concept viaduct (a SYSTRA license) in South Korea. SYSTRA carried out detailed design of the viaduct and provides construction supervision assistance on site. To mitigate impacts on already congested downtown traffic, viaduct span erection using precast concrete segments erected with launching girders was selected as the construction method. This provides convenient and fast installation as a natural complement to the cutting-edge technology of U-shape structure concept viaduct. The SYSTRA design focused on structure optimization and standardization to accommodate both budget and construction sequence constraints for this project located in a dense urban location. The design led to an optimized typical section, with capacity for two tracks and all necessary E&M systems and train operation requirements. Adjustments on key and end segment lengths enable a very flexible distribution of spanning, without major impact on mould numbers, hence providing further budget savings.