Technical Innovation of Wushan Yangtze River Bridge

(1) In the design of long-span concrete-filled steel tubular arch bridge, the influence of web members of steel tubular truss on bending stiffness is considered for the first time, the unified theory of concrete-filled steel tubular is adopted, and the bearing capacity and fatigue calculation method of arch ring joints of concrete-filled steel tubular truss are adopted, thus improving the design method of concrete-filled steel tubular arch bridge. (2) The arch ring adopts many structural technologies, such as full tube truss structure, vertical and horizontal web member arrangement, and the interaction between bridge deck beam and arch ring, which improves the overall mechanical performance of the bridge and is innovative. (3) Innovation and development of lightweight design of suspender beam, bridge deck beam and other structures, design of arch support structure as separation rib, and design of anti-corrosion structure of upper and lower anchors of suspender. (4) The cable crane system with cable span of 576m, lifting weight of 170t, tower height of 150.22m and lifting height of 260m was independently designed and arranged, which solved the problem of hoisting steel tube arch rib segments of super-long-span concrete-filled steel tube arch bridge, and developed and improved the cable hoisting technology without support. (5) In the cable crane system, the active cable carrier is developed for the first time, which solves the problems that the corresponding weight of the lifting rope is too large and the release end of the traction rope is too large. (6) The installation process of steel tube arch rib is implemented by using steel strand buckling cable, self-developed adjustable cable low-stress clip anchoring system and cable crane system, which is summarized as "unsupported cable-stayed buckling method for long-span concrete-filled steel tube arch bridge", which ensures the smooth installation of arch rib. (7) The concrete in the steel tube is continuously poured in sections, and the banks are continuously pumped from the arch foot to the vault according to the order of the first, second and third sections of the design section, which is summarized as "the construction method of concrete filled steel tube for long-span concrete filled steel tube arch bridge", which ensures the continuous pouring of large-volume chord tube concrete. (8) The achievement of "Research on Construction Technology of Super-long-span Concrete-filled Steel Tube Arch Bridge of Wushan Yangtze River Highway Bridge" has solved the technical problems such as hanging buckle of steel tube arch rib segments, continuous pumping and pouring of concrete-filled steel tube, and improved the construction technology level of long-span concrete-filled steel tube arch bridge in China. (9) "Research on Optical Fiber Sensing Monitoring System of Large Concrete Filled Steel Tube Arch Bridge" explores a new method of concrete filled steel tube monitoring and realizes remote monitoring of concrete filled steel tube quality. (10) Some projects carried out in connection with this bridge, such as "Application Research of Chemical Self-stressing Concrete Filled Steel Tube", "Study on the Influence of Void Defects on the Working Performance of Concrete Filled Steel Tube", "Study on the Influence of Initial Stress on the Bearing Capacity of Concrete Filled Steel Tube" and "Experimental Study on the Bearing Capacity of Arch Joints of Steel Tube Truss", have all been applied to this bridge, and the understanding of concrete filled steel tube arch bridge has been greatly improved. Wushan Yangtze River Highway Bridge won the first prize of Chongqing Science and Technology Progress Award, the second and third prizes of China Highway Society, two national patents and one national construction method.