The Design and Construction for Steel Box Girder of Jiashao Bridge

The main navigation bridge for Jiashao Bridge is a steel box girder, six-single-pylon, four-plane cable stayed bridge with span arrangement of 70+200+5×428+200+70=2680m. It is the largest multi-pylon cable stayed bridge worldwide currently with a steel box girder width of 55.6m, total bridge length of 2680m, the longest longitudinal slope for bridge deck of 0.45%, and total steel consumption of 77,000 tons. The main characteristics for separated carriage box girder structure are: the width of one carriage is wider and reaches 24m; the distance between left and right carriages is bigger and reaches 9.8m; the four cable planes make left and right carriages and have a relatively independent loads carrying state; rigid hinges are used in span middle of the whole bridge. This paper introduces the design and construction for steel box girder of Jiashao Bridge, including the erection of girder segments in no cable area, cantilevered assembling erection of four-plane steel box girder, and the closure plan for steel box girder of multi-pylon cable stayed bridge.