跨大面积水域桥梁墩柱沉降监测方法研究

Study on monitoring method for pier settlement in long span bridge over large water area

在跨大面积水域进行桥梁墩柱沉降监测,无法采用常规的水准测量方法。以某跨湖区桥梁为例,研究提出了采用水准测量和三角高程测量相结合的方法,利用水准测量方法对工作基点高程进行测量,用三角高程测量方法对工作基点和监测点之间的高差进行测量,并对三角高程测量的可行性和精度进行分析。结果表明,该方法不需要量取仪器高和目标高,仪器架设位置自由,测量速度快,且能达到监测精度要求。

The conventional water leveling methods faile to be used to monitor the settlement of bridge piers and columns in a large area of water. Taking a bridge in a crossing lake area as an example, this paper puts forward the method of combining water leveling with trigonometric leveling. The water leveling method is used to measure the elevation of working base point, the trigonometric leveling method is used to measure the elevation difference between working base point and monitoring point, and the feasibility and accuracy of trigonometric leveling are also studied and analyzed. The results show that the method does not need to measure the height of the instrument and the target height, while the position of the instrument is free, the measuring speed is fast, and it meets the requirements of monitoring accuracy.