Key Technologies in the Design and Construction of Steel Pipe Arch Bridge Connected to Cable Crane in Deep Gorge
Based on the Dongxi River Grand Bridge on the Wuxi-Zhenping Expressway,four sets of cable hoisting systems were designed for its location in a deep canyon,lack of construction access roads,and close proximity to bridges and tunnels,which made it impossible to erect a cable hoisting system that meets the requirements for bridge lifting in one go.A 1-ton temporary working cable is used for the hoisting of small machines,materials,and equipment during the early construction of the bridge.A 30-ton hoisting cable system is used to solve the hoisting of large construction equipment and materials such as slope excavators as early as possible.Two sets of 105-ton cable hoists are used for the hoisting of the arch ribs,upper columns,cover beams,and deck structures of the bridge.The two sets of 105-ton cable hoists use a large drop asymmetric cable hoisting system structure,with only one side equipped with a lateral displacement device and the other side being a fixed structure,which solves the problem of selecting and arranging cable anchoring systems in deep canyon terrain where it is impossible to set up cable towers on one side.Through field practice,a set of cable hoisting design and installation construction techniques suitable for deep canyon terrain conditions has been formed.Through the application of this technology,the construction difficulty of the cable hoisting system in this terrain condition has been greatly reduced and the work efficiency has been improved,with significant economic and social benefits.
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