摘要
连镇铁路五峰山长江大桥采用大跨度悬索钢桥,设计运行速度高,对有砟轨道铺设线形控制提出了较高要求。本文重点研究施工过程中温度、荷载等对成桥线形的影响,并提出相应的有砟轨道线形控制关键技术。结果表明:环境温度、附加荷载对大跨度悬索桥成桥线形影响显著,施工时应当合理控制温度与荷载条件以满足成桥线形设计要求;采用轨道二期恒载均匀布载方案可减轻施工荷载误差对高速铁路大跨度悬索桥成桥线形变化的影响,结合基于环境温度驱动的CPⅢ网随测随用方案与基于测量基准点的轨道线形动态调整技术,可忽略温度变化对测量精度的影响,提高轨道线形动态调整的及时性。现场实测,该桥上有砟轨道实现了TQI(Track Quality Index)值小于7 mm和动检车275 km/h达速通过的预期目标,验证了本文提出的有砟轨道线形控制技术的合理性。
The Wufengshan Yangtze River Bridge on Lianyungang-Zhenjiang railway is a long-span suspension steel bridge, which is designed to operate at a high speed and requires high alignment control of ballasted track laying. This paper focuses on the influence of temperature and load on the alignment of the finished bridge during construction, and puts forward the corresponding key technologies for alignment control of ballasted track. The results show that the environmental temperature and additional load have significant influence on the finished bridge alignment of long-span suspension bridge, and the temperature and load conditions should be reasonably controlled during construction to meet the design requirements of the finished bridge alignment. The adoption of uniform distribution of secondary dead load of the track can reduce the impact of construction load errors on the finished alignment of high speed railway long-span suspension bridge. Combined with the CPⅢ follow-up measurement scheme based on ambient temperature driving and the track alignment dynamic adjustment technology based on the measurement benchmark, the impact of temperature changes on the measurement accuracy can be ignored, and the timeliness of track alignment dynamic adjustment can be improved. Through field test, the ballasted track on the bridge has achieved the expected goal of TQI(Track Quality Index) value less than 7 mm and the moving inspection vehicle passing at 275 km/h, which verifies the rationality of the ballasted track alignment control technology proposed in this paper.
作者
范剑雄
FAN Jianxiong(Nanjing Railway Hub Project Construction Headquarters,China Railway Shanghai Bureau Group Co.Ltd.,Nanjing 210042,China)
出处
《铁道建筑》
北大核心
2022年第12期52-56,共5页
Railway Engineering
关键词
公铁两用桥梁
线形控制技术
现场试验
高速铁路大跨度悬索钢桥
有砟轨道
rail-cum-road bridge
alignment control technology
field test
long-span suspension steel bridge of high speed railway
ballasted track
