지하철 3호선 동호철교 하로판형교 구간 콘크리트도상화개량 시공 사례

In this report, we introduce the design criteria, construction case and performance of our track improvement project from ballasted track to concrete track on the example section of Dong-Ho Bridge (girder-plate type bridge) in Seoul Metro Line No. 3, after monitoring 3 years which is from Dec. 2002. 15-year-old Dong-Ho Bridge's ballast was crushed, worn away, reduced track absorption, had draining problems from the crushed ballast, and corrosion was progressing in steel bridge because the waterproof underneath track was partially damaged. So, we applied changing the track on bridge area from ballasted to concrete in order to keep the track watertight and improve durability of bridge by reducing its weight. This investigation is based on the design criteria and construction case of the concrete track on the girder-type bridge in operating line. We explain the main design, materials, and other performance results in detail and hope it to be helpful for the track improvement in operating line.