Research On Construction Control Of Large-tonnage Rotary Cable-stayed Bridge

In recent years,with the increasing development of the national economy,China’s highways,railways and other transportation undertakings have developed rapidly,and the density of road networks has increased significantly.The newly planned transportation lines will inevitably conflict with existing transportation lines and bridges can be well resolved.This problem,as an indispensable part of the transportation line,the bridge will definitely become the top priority of the development of transportation in the future.In order to meet the increasing travel needs of the people,and to build new transportation lines that do not affect the transportation operation when crossing existing lines,bridge rotation construction technology was born.Due to the unique advantages of the swivel bridge and its ability to meet the needs of modern transportation development,it has been adopted by more and more engineers.As the environment that the swivel bridge needs to cross becomes more and more complex,the technical standards of the swivel bridge also become higher and higher,so it has a high scientific research value in academic terms.In this paper,an example of a cable-stayed bridge with a weight of more than 80,000 tons that spans 21 railway lines and the main road of the city(145 + 240 + 110)with a single cable plane priestesses concrete double-rotation low-tower tower is used as an example Midas/ Civil and FEA simulated the stress of the entire bridge,beam,and swivel system,and analyzed a series of analyses on the construction control of the swivel cable-stayed bridge,which can be completed smoothly and safely for the entire construction process.Provide an effective basis.The main research contents of this article are: First,based on the actual characteristics of the bridge,the full bridge model of the bridge was established using the finite element software Midas / Civil,and it was accurately analyzed to determine the ideal state of each bridge construction stage and completion stage,providing theory for on-site construction in accordance with;Second,the construction control method using feedback control method is used to feedback control the linearity,stress and cable force of each important construction condition of the bridge,so as to ensure the safe and smooth completion of the construction of the bridge;Thirdly,for the case that the weight of the rotating body is too large to apply jacking force only at the turntable position,a method of jointly applying jacking force at the turntable position and beam end position is proposed,and the calculation formula for joint weighing is derived,The influence of the two combined weighing methods on the beam end weight and the lifting force exerted on the beam end on the linearity,stress and cable force is compared and analyzed.Provide reference again;fourth,due to the weight of the swivel,the eccentricity of the ball hinge caused by the unbalanced moment of the beam has a great impact on the swivel system.Different eccentricity hasdifferent effects on the swivel system.In order to ensure that the swivel system is not damaged,through Midas FEA The local model of the swivel system was established by finite element software,and the stress of the swivel system under different eccentricity was analyzed,which provided a theoretical basis for the on-site swivel construction and a reference for the design of the swivel system in the future.