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为获取大跨度桥梁水中塔墩在不同时间、不同工况以及运营阶段的沉降变形趋势,提出了长距离精密三角高程测量的水中塔墩沉降观测方法,并开展了沉降观测点布设、沉降观测网构建、野外观测实施和观测数据处理等方面的理论与实践研究。以黄冈公铁长江大桥为工程实例,采用精密三角高程测量的方法对大桥2号、3号主塔墩进行沉降观测,监测结果表明两座主塔墩的总沉降值约为2mm。
In order to obtain the trend of settlement and deformation of pylons in long-span water bridges at different time, different working conditions and operating phases, a long-distance precise triangular elevation measurement method for settlement of underwater pylons is proposed. The settlement observation points layout and settlement observation network Construction, implementation of field observations and observation data processing and other aspects of theoretical and practical research. Taking the Huanggang public railway Yangtze River Bridge as an example, the settlement of the main pylons of Bridge No. 2 and No. 3 was measured by the precise trigonometrical height measurement. The monitoring results showed that the total settlement of the two pylons was about 2mm.