The Designs And Constructions Of The Steel Tube Arch Rib-assembling For Wushan River Steel Tubular Arch Bridge

In recent years, Concrete-Filled Steel Tubular (CFST) arch bridge as a new arch bridge, which takes full advantages of concrete filled steel tube materials, increase the bearing capacity of the bridge. It has been developed greatly beacause of its good adaptation and construction of simple, beautiful shape.This paper takes the Yangtze River Bridge in Wushan as engineering background, whose net span is the number one of the same kind of bridge in the world. Studying on cable hoisting system design and construction of the CFST arch bridge, the paper takes systematic analysis and calculations on the key construction technology of the CFST arch bridge ,and puts it in practice successfully which provides experience for the similar long-span bridge construction of the follow-up construction.As the span is large, cable hoisting system installed steel tube arch rib Wushan Yangtze River Bridge, there are many technical difficulties in the implementation: the span of cable crane system is very long, tube arch rib major segmental carrying is large , hanging is difficult, the tower of cable hoisting system is high, how to ensure its stability is difficult; the lifting height of arch rib segmental component is also very tall, both conditions of the bridge located is steep terrain, seting transverse direction wind cable is diffcult when install arch rib segments, navigation is not forbidden , the location of the bridge is on the gold channel of the Yangtze River, which is in the Wu Gorge Gap, where the wind is big , the surface of the river is narrow, the water is deep and flow rapidly, many passing ships, it can not be forbidden too long in the construction period, only short-term.The purpose of this paper is to design and develop the systems of cable hoisting and cable-stayed regarding to the above key technologies.The systems have the Characteristics of lang-span and big carrying capacity, which adapt to the need of arch rid successful installation of long-span CFST arch bridge , through studying and claculating. In this paper, the research results are as follows:1. The assembling techniques of arch rid of CFST arch bridge are introduced. The key techniques, and emphases and difficulties of construction are studied.2. The tensile force and deformation of the main cable are studied and the tensile force of the main cable are calculated when the arch rib is installed being close to the tower. The effects of temperature changing on the assembling system of main cable are investigated. The details about the conformation are optimized. Thus the assembling system of main cable is designed successfully and is put in practice. 3. The strength of cable tower is checked and the effect of offset of cable tower on main tower is studied by using finite element program. The stabilities and strength of the main tower are validated.