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- Title
高速铁路大跨度钢桁架桥接触网腕臂安装技术研究.
- Authors
卢广苗
- Abstract
The longitudinal expansion and contraction of the long-span steel truss bridge is large and the displacement is complex in high-speed railways, which is an important factor affecting the normal and safe operation of the Cantilever deflection in overhead contact system ( OCS). At present, there are few researches on how to solve the coordination between the installation, offset adjustment of OCS cantilever and the expansion of steel beam in China. By studying the principle of cantilever deflection affected by the expansion and contraction of the conductor, and the principle of expansion and contraction of long-span steel truss bridges, by analyzing the influence of long-span steel truss bridge expansion and contraction on cantilever offset under different OCS layout plan, by point-by-point analyzing and summarizing the relationship between steel beam expansion and conductor expansion on cantilever deflection under different working conditions, a set of calculation method for cantilever installation curve under the combined actions of conductor expansion and steel beam expansion is proposed. Base on the calculation of typical cases, this paper holds that the recommended anchor section layout under different span steel beams can effectively reduce the cantilever deflection, and suggests that more attention should be paid to such matters as the cantilever deflection of the anchor section on both sides of the expansion joint, the length of the anchor section should be reduced when the cantilever deflection is superimposed and when the steel beam span is greater than 720 m, the calculation of double cantilevers spacing on both sides of the expansion joint should be optimized. The research contents and calculation formula can provide theoretical support for systematically solving the technical problems such as design, construction, operation and maintenance of OCS cantilever deflection on the long-span steel truss bridge in high-speed railways.
- Publication
Railway Standard Design, 2024, Vol 68, Issue 4, p186
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202211060001