异型拱桥顶系梁安装吊杆的施工分析与监测

针对全钢异型拱桥的受力特点,提出一种简单适用的顶系梁安装吊杆的施工方法。通过对1座机耕桥工程实例的计算分析及现场监测比较发现,该方法可以简单快捷地使吊杆获得合理的初张力,并使主梁线形满足设计要求。成桥后,顶升点附近的吊杆索力远大于其他吊杆索力,并承担了全桥主要恒载及活载。

Analysis and Monitor of Hanger Rod Installation by Jacking Tie-Beam on Heterotypical Arch Bridge

For the features of force on the full steel heterotypical arch bridge,an easy and appropriate method is proposed for installation of the hanger rod by jacking the tie beam.With calculation and analysis and comparison of results from site monitoring of a bridge for plowing tractors,it is found that the method can easily obtain adequate initial tension and has the main girder reach the design alignment.After completion of the bridge,hanger rod near the jacking spot is in the cable force much greater than other hanger rods and bears the main dead and live loads of the full bridge.