Photograph source：Nippon High strength Concrete Co.,Ltd
| Structure name | Koryu Bridge |
|---|---|
| Structure type | PC 8-span continuous box girder bridge |
| Structural factors | Length of bridge 801m Span length 79.5+4@106.5+2@109.0+74.5m |
| Client | Sapporo Deparement of Public Works Management,Sorachi General Subprefectural Bureau,Hokkaido Government |
| Designer | Civitec co.Ltd |
| Contractor | Joint-venture group Nippon High strength Concrete Co.,Ltd・DPS Bridge Works Co.,Ltd. Joint-venture group Nippon High strength Concrete Co.,Ltd・YamadaGumi Co.,Ltd. |
| Location | Ebeotsucho,takikawa City ～ Uryucho,Uryugun. |
| Route name | Ebeotsu-Uryu line, General Prefectural Road |
| River system | Ishikari River・Uryu River |
| Completion date | 2011. |
| Overview | The long-span Old Kohryu-bridge was replaced with a new bridge because it had a narrow carriage way and no sidewalk, its ratio of large vehicle traffic volume was 56％, and, due to its age, the durability was poor. The pier position and direction of the bridge were decided considering the impacts due to the bridge’s location near the merging of the Ishikari and Uryu Rivers. A pneumatic caisson method was applied for 6 of the 7 foundations due to the comparative quality of the ground conditions, and the superstructure was constructed using the cantilever method during the winter. Seismic isolation bearings were also adopted to improve the seismic performance. The pier position and direction of the bridge were decided considering the impacts due to the bridge’s location near the merging of the Ishikari and Uryu Rivers. A pneumatic caisson method was applied for 6 of the 7 foundations due to the comparative quality of the ground conditins, and the superstructure was constructed using the cantilever method during the winter. Seismic isolation bearings were also adopted to improve the seismic performance. |
