Hoisting Structural Design And Analysis Of Hong Kong-Zhuhai-Macao Bridge CB04Section Of131Abutments

The modular hoisting operation of the preformed units (the independent pier) in the CB04-section of Hong Kong-Zhuhai-Macao Bridge is the key factors during the engineering construction of Hong Kong-Zhuhai-Macao Bridge. The operation is difficult, and the environment is dangerous and complex. Also, the engineering requirement on precision is high. The pier was constructed as the reinforced concrete structure and its total weight is2044tons. In view that the hook fitting is big, and the hoisting operating environment lifting work environment is complex, in this paper a safe and feasible complex hoisting system was designed, including the hangers, upper lifting slings, lower lifting slings and hoisting riggings and so on so as to ensure the safety, reliability and accuracy of the independent pier modular hoisting procedure.The steel box girder structure is of many benefits such as high bending strength, stability, anti-fatigue performance, hoisting capacity, low-deflection deformation and so on. At the same time, considering the factors such as feasibility, economy and construction environment, the steel box structure was finally chosen in the lifting slings of pier hoisting. The material selection for lifting sling components is also vital. Q420B low alloy steel was chosen as the material of the cover plate and outside web and other main parts in the steel box girder lifting sling structure, and Q345B low alloy was selected as the material of the secondary parts such as the reinforcing plate, division plate and shell flange. The40Cr material was used in the connecting shaft and high strength bolts of the component steel. According to the factors, such as different hoisting weight, high-performance knotless loop was chosen for the rigging during the pier lifting sling.In this article combing with the design scheme of the pier lifting sling and using Pro/E, HyperMesh, Ansys and other software the structural design,3D modeling, finite element stress and strain analysis and reliability analysis were carried on. According to the analysis, the sling structure was optimized further, and the final solution was obtained. Also, on the basis of sling analysis results, the process of hoisting technology was formulated. Analysis results of the final solution show that first order buckling coefficient of the whole framework in the pier lifting sling is27.334, the second order buckling coefficient is29.451, and the third order buckling coefficient is40.984. The stability of the sling structure is good, which can meet the engineering requirements. And the stress and strain values of the sling structure are in the material allowable range, thus its strength and stiffness meet the engineering requirements.This paper has provided technical support for the safe and reliable operation of the modular hoisting operation of the preformed units (the independent pier) in the CB04-section of Hong Kong-Zhuhai-Macao Bridge. At the same time, it is of great significance on improving the efficiency, accuracy, security and predictability of behavior during the process of hoisting large components.