大跨度提篮拱桥吊杆索力的测试技术研究

Research on the Measurement Techniques for the Cable Tension of the Hanger Rods of Long-spanned Basket Arch Bridges

大跨度提篮拱桥的吊杆索力测试结果的正确与否直接关系到桥梁状态的合理确定。对目前吊杆索力测量的几种方法进行简单介绍与分析,并对本桥所采用的频率测量法的原理、测试方法进行了重点阐述和分析,对影响测量精度的要素——索长进行了修正,以保证索力测试的精度,能够为今后桥梁施工和监控提供更有价值的参考数据。

The accuracy of the measurement of the cable tension and hanger rods of long-spanned basket arch bridges is closely related to the correct evaluation of the condition of bridges.Several currently used measurement methods for monitoring cable tension are briefly introduced and analyzed in the paper,with greater stress placed on the presentation and analysis of the principles and the test methods of the frequency measuring method adopted for our present bridge,upon the basis of which the most influential factor of measurement accuracy,namely,the length of the cable,is modified so as to ensure the accuracy of the measurement.It may serve as a very valuable reference for bridge construction and monitoring in the future.