Planning and working of overall recoating for long-span bridges

摘要

The Ohnaruto Bridge is a suspension bridge with the main span of 876 meters,rncompleted in 1985 as the Japanese longest suspension bridge. Due to the severe corrosive condition,rnthe overall recoating for the truss-type stiffening girders and the truss-type main towersrnwas carried out from the fiscal year of 1998 to 2005. Especially, the automatic coating methodrnwas developed and applied to the main towers of the Ohnaruto Bridge for the first time in thernexisting long-span bridges. This paper describes the planning and working of overall recoatingrnfor the stiffening girders and the main towers of the Ohnaruto Bridge, considering the surroundingrnnatural condition, the working ability/safety and the coating quality/efficiency.