GNSS精密控制网在特大型桥梁施工监测中的应用——以虎门二桥为例

以虎门二桥为例,介绍了全球卫星导航系统(GNSS)精密定位技术在特大型桥梁中的具体应用,在基线解算时,通过提高概略坐标精度、选择合适的解算策略、合理的约束条件等提高控制网解算精度,使得控制网成果的各项精度指标满足要求．对虎门二桥8期测量成果的统计,进一步验证了控制网的测量精度,通过对部分点位坐标较差的计算,统计了点位的具JP2]体变动情况,采用单点检验法评定了控制点的稳定性,为其他类似跨海工程控制网提供了参考. 

Application of GNSS precision control network in super large bridge construction monitoring: a case of the second Humen bridge

Taking the second Humen bridge as an example, this paper introduces the specific application of GNSS precision positioning technology in extra large bridges. When calculating baseline, the precision of the control network is improved by improving the precision of the approximate coordinates, choosing the appropriate solution strategy and reasonable constraints, so that the accuracy of the control network results can be improved, and the indicators meet the requirements. The measurement accuracy of the control network is further validated by the statistics of the survey results of Phase 8 of Humen Second Bridge. By calculating the poor coordinates of some points, the specific changes of the points are counted. The stability of the control points is evaluated by the single point test method, which provides a reference for other similar cross sea engineering control networks.