Research on Key Technologies of Cantilever Lifting of Large Cantilever Spoke Truss Structure with Inner Support

In the conventional implementation projects using hydraulic lifting construction methods, the lifted structures have bilateral or multilateral lifting support boundary conditions, good structural stability. For cantilevered structures, especially cantilevered structures with particularly high heights, it is difficult to adopt the lifting construction method because it is impossible to set a balanced lifting point. The Xi’ an Silk Road Happy World Center Tower project is an all-steel special-shaped tower, consisting of an inner cylinder steel frame, an outer cylinder mesh shell, a large cantilever hub-and-spoke skirt truss, a top Mobius ring and an outer barrel shaped ribbon. Taking the Xi’ an Silk Road Tower project as the object, the cantilevered lifting construction technology used in the steel structure construction of the large cantilever hub-and-spoke skirt truss with inner support was studied. Through numerical analysis, the influence of different temporary reinforcement ( a circumferential bar or truss for reinforcement) on the structure during the lifting process is compared, a circumferential truss reinforcement is recommended for the lifting structure according to the comparison results. The influence of different lifting points on the structure during the lifting process was studied, and the recommended number of lifting points was given the number of 5 was optimal for this project. The technical points in the construction process were discussed and the experience was summarized, and the key points that need to be paid attention to in the lifting construction and temporary measures design of the steel structure of the large cantilevered spoke skirt truss were expounded. It expands the application scope of hydraulic lifting construction technology.