About the author:

1. China Railway Baoji Bridge Group Co.,Ltd., Baoji, Shaanxi 721006,China; 2. Guangdong BayArea Transportation Construction Investment Co., Ltd., Guangzhou, Guangdong 511400,China;3. China Railway Baoji Bridge Group （Zhoushan） Co.,Ltd., Zhoushan, Zhejiang 316000,China

Abstract:

The Shiziyang Bridge is the key control project of the super project Shiziyang Channel in theGuangdong-Hong Kong-Macao Greater Bay Area. The tower is 342m high and adopts steel shell-concretecomposite structure. The cable tower is novel in structure and difficult in technology. As the core stresscomponent of the cable tower, the manufacturing and construction quality of the steel shell is directlyrelated to the overall safety and durability of the bridge. In this paper, the key technologies ofmanufacturing and construction of steel shell of super high cable tower of Shiziyang Bridge are studied,including steel shell manufacturing, coating construction and machining. The application of automaticwelding technology of complex panel unit, automatic welding technology of shear stud and welding groupcontrol technology of bridge ring port is introduced. Engineering practice shows that the step-by-stepassemblywelding + phased correction manufacturing process adopted by the panel unit can effectivelysolve the problems of difficult control of thin-walled welding deformation and low manufacturingefficiency. The vertical assembly process adopted by the double-wall cavity large-section steel shellsegment improves the manufacturing quality. The application of wheel-mounted intelligent mobile platformequipped with spraying robot ensures the quality of steel shell coating. Automation and welding groupcontrol technology ensure the intelligent and high quality of welding process.