过海地铁隧道陀螺定向测量技术——以厦门地铁2号线为例

Gyro orientation survey technology in the first cross-sea metro shield tunnel of China

针对我国首条过海地铁盾构隧道的高精度贯通问题,本文在分析陀螺全站仪定向测量原理的基础上,详细介绍了Y/JTQ-1陀螺全站仪的定向工作流程、数据处理过程,进行了定向精度分析,讨论了减弱措施及其在城市轨道交通工程盾构隧道中的实际应用。工程应用实例表明,采用Y/JTQ-1下架式陀螺全站仪辅助定向,不仅能够满足隧道掘进过程中的定向精度要求,有效指导现场施工,而且降低了隧道掘进贯通的风险,提高了隧道的贯通精度,为其他同等规模类型的隧道掘进贯通提供宝贵的控制测量经验。

This paper mainly aims at the problem of high precision penetration of the first cross-sea shield tunnel of China,the oriented work flow,data processing and precision analysis,orientation error sources and weakening measures along with the practical application of the Y/JTQ-1 gyro total station are presented in details.By adopting the photoelectric integration method of the gyro total station under the frame,we can not only satisfy the precision of orientation survey in the process of tunnel excavation and effectively guiding the construction on site,but also improve the accuracy of tunnel breaking through and reduce the risk of tunnel holing-through.It can provide valuable experience in control survey for other tunnels of the similar scale type.