Fengdu Yangtze River Bridge Construction Methods And New Technology Research,

Fengdu Yangtze Suspension Bridge is characterized with out-spread overhead curved cable, tunnel-type anchorage and steel-truss stiffening girder. It is well-known for its new structure, complex technology, accurate workmanship, and difficult construction. It is valuable to review its construction method and new technique developed during construction.Concrete pylons are adopted for the Fengdu Yangtze Suspension Bridge, and normal construction methods for the pylons include slide formworks, turning shutters and climbing formworks. Climbing formworks with assembled steel-pipe scaffolding is a newly-developed technique for this bridge .It causes saving of the steel skeleton for construction of the pylons. By utilizing regular simple rods and parts, construction progress is fast and the quality is good. There are many materials and members to be hoisted during construction of the suspension bridge, unfortunately, the out-spread overhead curved cable makes it impossible for hoisting the stiffening girder with normal cable-supported lift. In order to ensure the construction proceeded smoothly, a multifunctional overhead cableway system is developed, thus accommodating all the hoisting tasks for the superstructure (stiffening girder). Subjecting to the bridge features, a light-type temporary footbridge and its erection method, a new wire strand hoisting system, a simplified wire compacting machine and a manual wrapping machine are also developed. Development of abovementioned systems ensures the smooth proceeding of the bridge construction and reducing construction cost to a large extent. This paper presents a detailed description about the development and study of abovementioned new techniques and new workmanship as well as their practical application.Erection and adjustment of the wire strand and the stiffening girder is the key critical work which has large impacts on the construction of the suspension bridge, detailed study is also carried out for these topics during the construction and this article tries to give a presentation.