Abstract:The main bridge of Chuan-Dian Jinsha River Grand Bridge is a double-pylon single-span simple-supported steel truss suspension bridge. Its main span is 1 060 m. The steel truss girder of the main bridge is divided into 71 segments, and the largest weight of the standard segment is about 269.3 t. The bridge is located in a geological area of structural weathering and high mountain gorges. The conditions for construction by the support method are not met. Therefore, the steel truss segments are installed using cable crane. Combined with the existing structures of the bridge and overall layout of the site, the spans of cable crane are designed as (193.605+1 060+220.908) m. The design maximum hoisting capacity is 269.3 t, and 1.1 times of impact coefficients are considered including the main cable, anchorage system, pylon top design, traction and hoisting system design (car system, hoisting cable and traction rope), cable supporting equipment design, and lifting lug and lifting gear design. Finally, the key construction technology of cable hoisting is discussed to provide the valuable references and lessons for similar bridge projects.
