高速铁路千米长联桥铺设无砟轨道施工控制
Construction Control of Laying Ballastless Track on Kilometer Long Joint Bridge of High Speed Railway
孙洪斌 1王品皓 2渠述锋 1郭玉鹏 1李俊 2杨荣山2
作者信息
- 1. 山东铁路投资控股集团有限公司,济南 250103
- 2. 西南交通大学 高速铁路线路工程教育部重点实验室,成都 610031
- 折叠
摘要
千米级长联大跨桥的桥面线形在塔-梁-索温度变化、桥上荷载变动作用下易产生较明显的竖向变化.本文结合新建郑州—济南铁路长清黄河大桥工程,建立轨道-桥梁系统一体化有限元模型,并根据不同施工阶段的实际温度及桥上压重荷载对模型进行实时修正,提出线形控制技术优化方案,以实现千米级长联大跨斜拉桥上无砟轨道的高精度施工.结果表明:利用修正后的相对高差控制底座板放样施工,可将全桥底座板偏差控制在-10～10 mm内,计算相对高差时要考虑二期恒载的影响及实际施工温度与设计温度的偏差;利用修正后的绝对高程来控制轨道板精调,可使最终实测线形与设计线形的偏差控制在-2.0～1.6 mm内,每跨施工作业周期内温度变化不超过2℃;采用60 m弦中点弦测法对精调后的轨面线形进行复核,测得最大弦测值为2.67 mm,满足规范要求.
Abstract
The bridge deck alignment of a kilometer level long joint large span bridge is prone to significant vertical changes under the influence of tower-beam-cable temperature fluctuations and load changes on the bridge.This article combined the construction of the Changqing Yellow River Bridge project on the Zhengzhou-Jinan railway to establish an integrated finite element model of the track-bridge system.The model was modified in real-time based on the actual temperature and bridge load at different construction stages,and an optimization scheme for alignment control technology was proposed to achieve high-precision construction of ballastless tracks on kilometer level long joint large-span cable-stayed bridges.The results show that using the corrected relative height difference to control the layout construction of the base slab can control the deviation of the entire bridge base plate within-10～10 mm.When calculating the relative height difference,the influence of the second phase dead load and the deviation between the actual construction temperature and the design temperature should be considered.By using the corrected absolute elevation to control the precise adjustment of the track slab,the deviation between the final measured alignment and the designed alignment can be controlled within-2.0～1.6 mm,and the temperature change during construction operation period of each span should not exceed 2℃.The 60 m chord midpoint chord measurement method was used to review the fine tuned rail surface alignment,and the maximum chord measurement value was measured to be 2.67 mm,which meets the specification requirements.
关键词
铁路桥梁/施工控制/有限元模型/长联斜拉桥/无砟轨道/相对高差/中点弦测法Key words
railway bridge/construction control/finite element model/long joint cable-stayed bridge/ballastless track/relative height difference/midpoint chordal measurement method引用本文复制引用
出版年
2024
NETL
NSTL
万方数据