摘要
盾构隧道施工下穿既有桥梁基础,势必引起既有桥梁基础沉降、位移。文章基于盾构隧道连续多次下穿铁路线桥梁基础工程实例,分析了盾构穿越过程中桥梁变形情况、风险辨识及控制标准,主要采取优化盾构隧道线型设计、提高盾构自身控制、落实地面控制措施、落实工后控制措施四个措施减少施工影响,降低施工风险。在此基础上,提出了盾构隧道下穿铁路质量控制措施。结果表明,施工过程桥梁桩基最大沉降值为1.263 mm,最大位移值为0.198 mm,沉降、位移监测结果均满足限值要求,保证了盾构施工过程既有铁路线运营安全。
Shield tunnel construction undercrossing the existing bridge foundation is bound to cause the settlement and displacement of the existing bridge foundation.Based on the example of shield tunnel undercrossing the bridge foundation engineering of railway line for many times,this paper analyzes the bridge deformation,risk identification and control standard in the process of shield crossing,and mainly adopts four measures to reduce the construction impact and reduce the construction risk,such as optimizing the linear design of shield tunnel,improving the self-control of shield,implementing the ground control measures and implementing the post-construction control measures.On this basis,the quality control measures of shield tunnel under railway are put forward.The results show that the maximum settlement value of the bridge pile foundation during the construction process is 1.263 mm,and the maximum displacement value is 0.198 mm.The settlement and displacement monitoring results meet the limit requirements,which ensures the operation safety of the existing railway line during the shield construction process.
作者
许建营
XU Jianying(China Railway 15th Bureau Group Urban Rail Transit Engineering Co.,Ltd.,Yangzhou 225100,Jiangsu,China)
出处
《工程技术研究》
2024年第7期68-70,共3页
Engineering and Technological Research
关键词
盾构隧道
铁路桥梁
变形预测
自动监测技术
shield tunnel
railway bridges
deformation prediction
automatic monitoring technology
