摘要
孟加拉国帕德玛大桥铁路连接线为设计轴重25 t的客货共线铁路,桥上采用无砟轨道及跨区间无缝线路。基拉里甘杰站咽喉区位于简支梁桥上,此运营条件下的简支梁上无缝道岔群在国内外较为罕见。为保证结构安全,通过建立“岔梁墩一体化”计算模型,对伸缩、挠曲、断轨、制动工况下的道岔强度和纵向稳定性进行了分析,结果表明:(1)基拉里甘杰站钢轨纵向力最大值出现在正线(即“股道-2”)上,铺轨及运营过程中应重点关注正线的无缝线路服役状态;(2)钢轨纵向应力、钢轨断缝值、尖轨尖端位移、心轨位移、转辙器处基本轨位移、间隔铁纵向力等指标均满足规范要求,设计方案合理;(3)本文所采用的无缝道岔检算方法,既论证了25 t轴重条件下简支梁上铺设无缝道岔的可行性,同时也对中国标准“走出去”指导海外铁路跨区间无缝线路设计有一定的指导意义。
The Padma Bridge on a railway connecting line in Bangladesh,which is a mixed passenger and freight railway with a design axle load of 25 t,and ballastless track and trans-section continuously welded rail track are laid on the bridge.The throat area of Keraniganj Station is located on a simply-supported girder bridge.Under this operation condition,the continuously welded rail turnout group on the simply-supported girder is rare both in and out of China.In order to ensure the structure safety,the strength and longitudinal stability of the turnout under the working conditions of expansion,deflection,broken rail,and braking were analyzed by establishing an integrated calculation model of the turnout,girder,and pier.The results show that:(1)The maximum longitudinal force of rail at Keraniganj Station appears on the main track(i.e."Track-2"),and attention shall be paid to the service state of the continuously welded rails of the main track during track laying and operation.(2)Longitudinal stress of rail,rail fracture value,displacement of the point of switch rail,displacement of point rail,displacement of stock rail at the switch,the longitudinal force of spacer block,and other indexes meet the specification requirements,and the design scheme is reasonable.(3)The method for checking calculation of continuously welded rail turnouts applied in this paper not only demonstrates the feasibility of laying continuously welded rail turnouts on simply supported girders under the condition of 25 t axle load,but also has certain significance for the Chinese standards"going global"to guide the design of trans-section continuously welded rail tracks of overseas railways.
作者
杨文茂
林红松
徐井芒
徐浩
赵思琪
YANG Wenmao;LIN Hongsong;XU Jingmang;XU Hao;ZHAO Siqi(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;Southwest Jiaotong University,Chengdu 610031,China)
出处
《高速铁路技术》
2023年第2期13-18,47,共7页
High Speed Railway Technology
基金
中铁二院工程集团有限责任公司科学技术研究计划(KSNQ213031)
中铁二院工程集团有限责任公司科学技术研究计划(KSNQ223022)。
关键词
简支梁
无缝道岔
岔桥墩一体化模型
纵向力
位移
simply-supported girder
continuously welded rail turnout
integrated model of turnout,girder,and pier
longitudinal force
displacement
