温度作用下桥墩高差对桥上无缝道岔影响研究  

Research on the Influence of Height Difference of Piers on the Welded Turnout on Bridge under Temperature Action

作　　者：林红松[1] 徐浩[1] 曹保[1] 潘自立[1] LIN Hongsong;XU Hao;CAO Bao;PAN Zili(China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道工程学报》2022年第6期61-66,共6页Journal of Railway Engineering Society

基　　金：中国科协青年人才托举工程(2019QNRC001);中铁二院科学技术研究计划(KYY2017055(17-20));中铁二院科学技术研究计划(KYY2019032(19-22))。

摘　　要：研究目的:为研究温度作用下桥墩高差对连续梁上无缝道岔的影响规律,本文以某(40+56+40)m变宽连续梁上18号道岔为研究对象,建立岔-梁-墩一体化计算模型,研究温度作用下相邻桥墩高度差引起的竖向变形对桥上无缝道岔的受力及平顺性的影响。研究结论:(1)桥墩升温对桥上无缝道岔纵向受力基本无影响,但对道岔区高低不平顺影响较大;(2)当桥墩升温30℃时,桥上无缝道岔伸缩力增大0.54%,因此检算桥上无缝道岔纵向受力时可不考虑桥墩高度差的影响;(3)随着道岔梁相邻桥墩高差的增大,钢轨竖向变形增大,道岔区高低不平顺偏差增大;(4)当相邻桥墩高度差超过76 m时,采用10 m弦正矢差评价的高低不平顺偏差超过2 mm限值;(5)相关研究成果可为铁路高墩大跨连续梁上无缝道岔设计提供借鉴和参考。Research purposes:In order to study the influence of the pier height difference on the welded turnout on the continuous bridge under the temperature change,this paper takes No.18 turnout on a(40+56+40)m continuous bridge as the research object,establishes the turnout-bridge-pier calculation model,and studies the influence of vertical deformation caused by the height difference of adjacent bridge piers on the stress and irregularity of the welded turnout on the bridge under the action of temperature.Research conclusions:(1)The temperature rise of bridge pier has basically no effect on the force of welded turnout on the bridge,but has a greater impact on the vertical track irregularity of turnout area.(2)The expansion force of the welded turnout on the bridge increased by 0.54%when the pier temperature rises by 30℃.Therefore,the effect of the high difference of the bridge pier could not be considered when checking the longitudinal force of the welded turnout on the bridge.(3)With the increase of pier height difference between adjacent piers of the turnout bridge,the vertical deformation of the rail increases,and the vertical track irregularity deviation on the turnout area increases.(4)When the pier height difference between adjacent piers exceeds 76 m,the vertical track irregularity deviation exceeds the limit of 2 mm using the 10 m string positive sag difference evaluation.(5)The research results could provide reference for the design of welded turnout on continuous bridge with high piers.

关 键 词：桥墩高差 无缝道岔 连续梁 伸缩力 平顺性 

分 类 号：U211.5[交通运输工程—道路与铁道工程]