邻近既有线桥梁冲击钻施工振动监测与安全措施优化研究  

Research on Vibration Monitoring and Safety Measures Optimization of Percussion Drill Construction for Bridges Adjacent to Existing Lines

作　　者：周国华 ZHOU Guohua(China Railway 11th Bureau Group Co.Ltd.,Wuhan Hubei 430061,China)

机构地区：[1]中铁十一局集团有限公司,湖北武汉430061

出　　处：《铁道建筑技术》2025年第1期135-139,共5页Railway Construction Technology

基　　金：中国铁建股份有限公司科技研发计划项目(2022-B03)。

摘　　要：随着交通基建推进,邻近既有线桥梁的冲击钻施工增多,其振动危害大,可致桥梁疲劳损伤等,与列车振动叠加引发共振更危及安全。通过工程案例的特定地点冲击钻施工,分析其施工振动传播特性;通过现场监测,分析既有线桥体稳定性、振动情况,表明桥墩顶部对振动更敏感;进而开展安全措施优化研究,采取选用低振动设备、注浆加固地层、设置隔振屏障等措施。优化后监测结果显示,既有线桥体各部位速度与加速度降幅达40.6%~55.2%,振动频率下降48%~52%。列车通过时,优化前后桥身振动频率变化明显,如60 min无列车时从30 Hz降至14.4 Hz,有列车时从34.2 Hz降至15.6 Hz,有力保障了既有线桥梁的稳定性与安全性,可为类似工程提供参考。With the promotion of transportation infrastructure,the construction of percussion drill for bridges adjacent to existing lines has increased,which poses significant vibration risks that can contribute to fatigue damage to bridges and other structural issues,and the resonance caused by superposition with train vibration is more dangerous to safety.The analysis of the construction vibration propagation characteristics was conducted through percussion drilling at a specific site of the project case.Field monitoring was employed to analyze the stability and vibration of the existing cable bridge,revealing that the top of the pier is more sensitive to vibrations.Subsequently,optimization research on safety measures was conducted,including the selection of low-vibration equipment,using grouting to reinforce the ground,and the installation of vibration isolation barriers.The optimized monitoring results indicate that the speed and acceleration at various parts of the bridge were reduced by 40.6%to 55.2%,and the vibration frequency decreased by 48%to 52%.When the train passes,the vibration frequency of the bridge body before and after optimization changes significantly,dropping from 30 Hz to 14.4 Hz when there is no train in 60 minutes,and from 34.2 Hz to 15.6 Hz when there is a train,which effectively enhances the stability and safety of the existing bridge and provides a valuable reference for similar projects.

关 键 词：冲击钻施工 振动监测 安全措施优化 共振风险 地层加固 隔振屏障 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U445.551[交通运输工程—道路与铁道工程]