Study On Design And Construction Technology Of Composite Cable Hanging Basket Of Cable-stayed Bridge

It has been hundreds of years since the appearance of cable-stayed bridges.With the development of the structure and scale of cable-stayed bridges,the construction methods are also diversified.Among them,the hanging basket has the characteristics of light weight,convenient construction,and reusability.Therefore,it has been widely used in cast-in-place concrete bridges.However,due to various factors during the construction process,the hanging basket structure is often deformed,and then It affects the quality of concrete pouring,increases construction costs and affects the safety of construction workers.For the cast-in-place main girder of the cable-stayed bridge,the traditional hanging basket has certain defects.In this paper,a new type of composite hanging rope structure is designed by combining the respective advantages of the hanging rope hanging basket and the rear fulcrum hanging basket.This paper discusses the applicability and safety of the composite drag rope hanging basket in the cantilever pouring construction of the long-span cable-stayed bridge,which has significant benefits for improving the construction quality of the cable-stayed bridge and reducing the construction cost.The main work of this paper is as follows:1.Comparing with the conventional construction technology,the characteristics and principles of the construction method for the composite guyed traveler.2.Analyzed the structural design features of the composite dug-rope basket.Taking the composite dug-rope basket used in the construction of Xiangxianghe Bridge as an example,the overall finite element model of the structure of the cable-stayed bridge cantilever cantilever construction stage and the fine structure of the basket were analyzed.Finite element model,with detailed analysis of structural force and deformation.3.Through the analysis of the construction control process of Xiangshuihe Bridge,the correctness of the overall finite element modeling,calculation and analysis of the cantilever construction stage of the composite lanyard is verified,which provides a certain theoretical basis for the bridge alignment control.At the same time,the influence factors of vertical formwork elevation and deflection control in the construction process are analyzed,and the construction temperature and the rigidity of the hanging basket have a great influence.4.On the basis of the impact matrix method,the cable tension could be calculated accurately by finite element software combined with iteration method.After the bridge closure,there are only 6 stay cables which the cable force is unqualified.After adjusted by the hierarchical iterative method,the cable force error of the bridge is controlled within 2%.5.The mechanical properties of the Xiang-shui River Bridge were evaluated through the structural performance tests.The values of stress and deflection are smaller than the calculated ones,and for the natural frequency is on the contrary.The measured impact factor is 1.04 which is in good agreement with the calculated value 1.05.It is also further verified that the mechanical performance of the cable-stayed bridge in the operation stage can be ensured by the construction method of composite guyed traveler.