大型跨海沉管隧道施工监测新技术

New construction monitoring technology for large-scale cross-sea immersed tube tunnel

沉管隧道施工荷载变化快,受天气影响大,施工环境复杂,导致土木工程常见监测技术无法满足大型沉管隧道施工需求。为准确掌握沉管隧道在不同施工阶段的荷载变化情况,依托港珠澳大桥沉管隧道,通过多种新的监测技术和方法获得了沉管的超低频振动振幅与振动频率、沉管起浮姿态、管节间差异沉降等数据。通过监测数据的分析,发现端封门存在的风险隐患。新技术新方法的应用使监测工作做到施工全区域、全阶段覆盖。实时监测与定时监测,并辅以定期巡查,确保了监测数据的实时上报与监测系统的稳定运行。

The construction load of immersed tube tunnel changes rapidly,which is greatly affected by the weather and the construction environment is complex,so the common monitoring technology of civil engineering can't meet the construction requirements of large-scale immersed tube tunnel.In order to accurately grasp the load changes of immersed tube tunnel in different construction stages,relying on the immersed tube tunnel of Hongkong-Zhuhai-Macao Bridge project,the data of ultra-low frequency vibration amplitude and frequency,floating pose of immersed tube,differential settlement between the tube joints were obtained.The hidden risk of the bulkhead was found out through the analysis of the monitoring data.The application of new technology and method makes the monitoring work cover the whole construction area and stage.By means of real-time monitoring and timing monitoring,supplemented by regular inspection,it ensures the real-time report of monitoring data and the stable operation of the monitoring system.