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新建城市轨道交通穿越既有线为重大风险工程,综合上跨和下穿两种形式的穿越更应严格控制既有线的变形,保证既有线的安全运营。通过第三方监测和微量位移技术相结合的方式,对首都机场线东直门车站上跨和下穿既有13号线折返线工程进行变形控制。监测过程中密切关注隧道结构和轨道结构的变形,发现多次数据超值现象,经过自动化监测系统和顶升系统的同步应用,对既有折返线进行了有效的位移调控,既有13号线折返线的安全运营未受影响。结果表明第三方监测和微量位移技术的结合可及时掌控既有线的安全状态,有效调整既有线的过量位移,值得类似工程推广。
New urban rail transit through the existing line as a major risk project, the comprehensive cross-and through the two forms of wear and tear should be more strictly control the deformation of existing lines to ensure the safe operation of existing lines. Through the combination of third-party monitoring and trace displacement technology, the deformation control of the project of rebuilding the line of the existing No. 13 line on the crossing of Dongzhimen Station of Capital Airport and the crossing of the existing line 13 is carried out. During the monitoring, the deformation of the tunnel structure and the orbital structure are closely monitored, and many data value phenomena are found. Through the synchronous application of the automatic monitoring system and the jacking system, effective displacement control is performed on the existing reentry line. The safe operation of the return line is not affected. The results show that the combination of third-party monitoring and trace displacement technology can control the safety status of existing lines in time and effectively adjust the excessive displacement of existing lines, which deserves to be popularized in similar projects.