Research on the System Transformation Construction Scheme of Egongyan Railway Bridge

ZHANG Haishun, TANG Yougang

Journal of Railway Engineering Society ›› 2020, Vol. 37 ›› Issue (7) : 57-62.

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Journal of Railway Engineering Society ›› 2020, Vol. 37 ›› Issue (7) : 57-62.
Main Line: Bridge Engineering

Research on the System Transformation Construction Scheme of Egongyan Railway Bridge

  • ZHANG Haishun1, TANG Yougang2
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Abstract

Research purposes: The Egongyan railway bridge is a self-anchored suspension bridge with the span of 600 m. Due to the constraints of surrounding factors, only the method of cable-stayed suspension system conversion can be used for the bridge construction for the first time in the world. The cable suspension system transformation conversion process is the most important steps in the process of building the bridge construction. More construction links, complex interference factor, cross control parameters, small deformation large displacement of the nonlinear characteristics significantly are the overall characteristics of the cable suspension system transformation process. In order to reduce the difficulty of the sling tensioning schemes in the process of system transformation, the optimization design of the main girder alignment was adjusted after the completion of cable-stayed bridge, and the elevation difference between main cable and girder was reduced, which ensures the safety of the system conversion and greatly optimizes the system transformation scheme. Through the gradual decomposition of the actual construction scheme, and the combination of the actual monitoring bridge structure response and the finite element simulation, a systematic study on the transformation of cable-stayed cable system was carried out, to guide the whole process of construction.
Research conclusions: (1) The structural stress of cable stayed-suspension coupling system was complex, it was necessary to combine the actual monitoring data extraction analysis and numerical simulation research to study the mechanical changes in the system transformation process of two independent cable crane systems. (2) The cable index and measured cable force in the process of girder alignment adjustment were given, as well as the whole transformation process of the system including the measured cable tension. (3) The research results can provide reference for the completion of the large span self-anchored suspension bridge without support.

Key words

self-anchored suspension bridge / system transformation / transitional cable-stayed bridge / sling tension / alignment adjustment of main beam

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ZHANG Haishun, TANG Yougang. Research on the System Transformation Construction Scheme of Egongyan Railway Bridge[J]. Journal of Railway Engineering Society, 2020, 37(7): 57-62

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