Study On Theory Of Construction Control And Control Precision For Long-span Cable-stayed Bridge

The Cable-stayed bridge structure system is complicated,super quiescent high frequency, forming process is complicated (different construction scheme has different forming process, forming process is also the system conversion process)and will be affected by many factors. in the formation process of cable-stayed bridge, the power system of the structure is constantly changing and the internal and linear is also constantly changing, in order to ensure in the bridge construction process, the structural si safe and the internal force and linear can meet the design requirements, we must carry on the construction control. China has built more than 100 of the cable-stayed bridge but still don't establish a reasonable construction precision control standards. So for a long span cable-stayed bridge the research of construction control accuracy has important theoretical significance and value. Based on JingYue changjiang river highway bridge engineering background, the paper are mainly for the following content of researchFirst, Introduced hybrid girder cable-stayed bridge design and construction characteristics, Briefly explain the JingYue Yangtze river bridge's design and construction.Usinging the plane BDCMS program (bridge construction control system design and the construction control calculation) simulation the construction process, Using the installing calculation method according to the order of the bridge construction and phase step simulation the calculation of structure formation process to determine the construction stages of structure and linear .Secondly, Introduces the construction control analysis method of the JingYue Yangtze river bridge and the geometrical monitoring, force stress and RC monitoring of Objective and content. The text summarized from Linear, stress and RC force results of the construction control and puts forward the bridge in the error correction method and procedure .Again, Introduces the error sources in the construction process of the cable-stayed bridge, errors In the process of the construction control of are discussed and analys comprehensivily the various parameters on the effect of bridge structure. Through the main control parameters such as weight, main beam, the stiffness of tower and stay-cables and tension etc to identify the sensitivity analysis of main design parameters. By error analysis method, this paper built on the bridge of the recent data statistics and analysis the JingYue Yangtze river bridge in the construction phase and bridge phase and gave the construction control precision phase target.Finally,Studied the JingYue Yangtze river bridge construction control precision analysis method, by the parameter of the weight of the girder which is sensitive as the only– one and other parameters of the influence of the parameters remain unchanged, analysis on the main control bending moment and elevation effects.