Abstract
The Nishikigaoka No.3 Overbridge of the Hokkaido (traversing) Expressway, a PC diagonal tension bridge, which is the first full-fledged highway bridge ever constructed in Japan. The bridge constructcion has a 3 chamber box girder with 2 continuous spans of an independent single column 3 layer harp type. The main tower constructed by a post tension system is eccentricall positioned in both the axial direction of the bridge and the right angle direction of the bridge axis, resulting in continuous torsions. Using the Freyssinet method (27H15), the diagonal tension cables were inserted after the installation of protective pipes. This study covers the design and construction of the bridge.
