利用中间三角高程传递法进行桥梁水中墩沉降观测

Settlement Observation of Immersed Bridge Piers with Midpoint Trigonometric Leveling Method

桥梁墩身的沉降观测是高速铁路线下沉降观测的重要内容之一,但当遇到大面积水域时,常用的几何水准测量就难以进行了。为此,文中引入中间三角高程传递法,并以某高速铁路线下工程水中墩观测为实例,分析该方法的测量精度。结果表明,中间三角高程传递法能满足规范要求,施测速度快,且观测精度能满足无砟轨道线下工程桥梁墩身沉降变形观测的技术要求,可以确保建设期和运营期沉降观测数据的质量和观测期次,并为沉降评估提供了可靠的沉降监测数据。

The settlement observation of bridge piers is a major task in settlement observation of works under track on high speed railway. However, it＇s hard to be implemented by geometric level measurement in large area of water. Therefore, taking an observation of immersed piers on a certain high speed railway for example, this paper introduces the observation and calculation of midpoint trigonometric leveling method, and analyzes the measuring precision of the method. The results show that these methods meet the requirements in code, and with a quick observation, they satisfy the technical requirement for precision, which can ensure the observation quality and frequency in construction stage and operation stage and provide reliable monitoring data of settlement assessment as well.