连续箱梁桥同步顶升技术研究

Research on Synchronous Jacking Technology of Continuous Box Girder Bridge

摘要:

为对连续箱梁桥同步顶升技术进行研究，以淮北某立交桥为研究对象，通过顶升全过程监测以及有限元分析，分析了连续梁桥顶升过程中位移和应力变化情况以及顶升位移偏差对结构内力的影响。结果表明，在更换支座的过程中，结构会产生较大横向和纵向偏位，应密切关注各顶升支点位移情况，同时做好限位措施；顶升过程中，梁底受力方向与桥梁竖向位移差异变化基本一致，顶升施工安全可靠；截面的附加应力对中墩的位移偏差更加敏感。

Abstract:

In order to study the synchronous jacking technology of continuous box girder bridges, taking an overpass in Huaibei as the object of study, and through the monitoring of the whole jacking process and the finite element analysis, the displacement and stress variation of continuous beam bridge during jacking and the influence of jacking displacement deviation on the internal force of the structure are analyzed. The results show that the structure will produce the large lateral and longitudinal deflections in the process of replacing the supports. Therefore, the close attention should be paid to the displacement of each lifting fulcrum, and also the displacement limiting measures should be taken. The stress direction of beam bottom is basically consistent with the difference of vertical displacement of bridge. The jacking construction is safe and reliable. The additional stress of section is more sensitive on the displacement deviation of the middle piers.