大跨斜拉桥预拱度设置对无砟轨道线形的影响

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摘要 研究目的: 针对时速350 km高速铁路大跨度斜拉桥无砟轨道竖向变形易超限的问题,研究设置合理的预拱度是有效的解决方法之一。本文运用60 m弦测法和列车行为动力学评价法对南玉高铁百合郁江特大桥主桥在不同荷载组合作用下的线形进行评价分析,探究不同预拱度方案对大跨度斜拉桥无砟轨道线形控制的影响规律。
研究结论: (1)收缩徐变是影响无砟轨道线形标准控制的主要因素,应在无砟轨道施工前确保足够的沉降变形观测期;(2)在所有温度荷载和徐变作用下,“取列车单线运营活载的变形反向等值”的预拱方案对线形标准控制效果最为显著;(3)设置预拱度能够有效增大等效曲率半径和降低离心加速度;(4)大跨度斜拉桥线形最不利位置为桥塔和主跨跨中处,需加强施工质量控制和运营期观测养护;(5)本研究成果可为大跨度无砟轨道斜拉桥的设计和施工提供借鉴和参考。

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	王俊冬

关键词 ：大跨度斜拉桥, 无砟轨道, 预拱度, 60 m弦测法, 列车行为动力学

Abstract：Research purposes: To address the problem that the vertical deformation of large span ballastless track cable-stayed bridges of 350 km/h high-speed railway is easy to exceed the limit, setting a reasonable pre-camber is one of the effective solutions. This paper uses 60 m chord measurement method and train behavior dynamic evaluation method to evaluate and analyze the alignment of the Baihe Yujiang Main Bridge of Nanning-Yulin High Speed Railway under different load combination deformation, and explores the influence of various pre-camber schemes on the alignment of large span ballastless rail cable-stayed bridge.
Research conclusions: (1) Concrete shrinkage and creep is the main factor affecting ballastless track alignment standard control, and sufficient observation period of settlement deformation should be ensured before construction of ballastless tracks. (2) Under the effect of all temperature load and creep, the pre-arch scheme of "taking the negative value of the vertical deformation caused by a train operating on the bridge" has the most significant effect on alignment standard control. (3) Setting the pre-camber can effectively increase the equivalent radius of curvature and reduce the centrifugal acceleration. (4) The most unfavorable position of the large-span cable-stayed bridge is at the tower and the middle of the main span, which needs to strengthen the construction quality control and observation and maintenance during the operation period. (5) The research results can provide reference for the design and construction of large span cable-stayed bridge.

Key words： large span cable-stayed bridge ballastless track pre-camber 60 m chord measurement method train behavior dynamics

收稿日期: 2022-09-26

PACS:

U212.3

基金资助:陕西省自然科学基础研究计划资助项目(2022JQ-303);中铁第一勘察设计院集团有限公司科技开发计划项目(院科19-90)

作者简介: 王俊冬,1986年出生,男,高级工程师。

引用本文:

王俊冬. 大跨斜拉桥预拱度设置对无砟轨道线形的影响[J]. 铁道工程学报, 2022, 39(12): 41-48.
WANG Jundong. Research on the Influence of Pre-camber Setting of Large Span Cable-stayed Bridge for High-speed Railway on Ballastless Track Alignment Control. Journal of Railway Engineering Society, 2022, 39(12): 41-48.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I12/41

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