大坡度高落差桥梁挠度监测方案试验研究

Experimental Study on Deflection Monitoring Scheme of Steep Gradient and High Drop Bridge

为了研究大坡度桥梁特别是大坡度中小桥梁挠度观测难的问题,对各种监测方法从测量精度、测量速度和测量范围等方面进行深入的分析与比较,指出各种方法的应用范围和特点。通过应用静力水准仪测试黑龙江牡丹江三股线大桥挠度,分析了静力水准仪的两种安装方法在测量过程中产生测量误差的原因,并进行误差精度分析。数据分析表明在中小桥梁挠度监测中,连通管液位式挠度测量法是目前常用方法中最适合的监测方法;而在高坡度中小桥梁中外接支架测量法比转接点测量法不仅降低成本,处理数据方便,而且精确度很高,可以在今后的检测工作中大规模推广使用。

In order to study the problem of difficulty in observing and measuring steep gradient bridges,especially middle-small-scale steep gradient bridges, various monitoring methods from the aspects of measurement accuracy,measurement speed and measurement range are deeply analyzed and compared,and the application scope and characteristics of various methods are also pointed out. Through the application of static force level gage in deflection testing on Heilongjiang Mudanjiang Sanguxian bridge,the causes of measurement error of static force level gage using 2 installation methods in the measuring process are analysed,and the error precision analysis is conducted. The data analysis shows that（ 1） in the monitoring of middle-small-scale bridge deflections,the connected pipe liquid level deflection measuring method is the most suitable one among present common methods;（ 2） compared to transferring point measuring method,external support measuring method applied in steep gradient middle-small-scale bridges can lower the cost,make data processing more convenient and achieve a higher accuracy,it can be widely used in the future measurement.