多拱面系杆拱桥吊索张拉控制方法的创新技术研究

Research on Innovative Techniques for Suspenders Tensioning Control of Multi-Rib Tied-Arch Bridges

摘要: 本文以宜丰县工业园至火车站公路新建工程的跨武吉高速立交桥三拱面钢箱系杆拱桥为研究背景，探讨了施工中多拱面系杆拱桥张拉力计算方法以及不同施工阶段的索力测试方法。针对多拱面系杆拱桥吊索张拉创新提出并采用了在张拉阶段采用以张拉千斤顶和相应的油压表为主、频率法为辅助的组合式控制，在吊索非张拉阶段采用张拉阶段标定的索力系数和吊索的弯曲刚度作为依据并用频率法进行测试的综合控制方法。经过实际应用表明，该综合方法在多拱面系杆拱桥施工过程中对吊索索力的控制取得了较为理想的效果，能够为未来类似桥梁的索力控制提供参考。

Abstract: This paper takes the three-rib steel box tied-arch bridge of the cross-Wuji Expressway overpass in the newly constructed road project from the Industrial Park to the Railway Station in Yifeng County as the research background. It explores the calculation method for tensioning forces in multi-rib tied-arch bridges during construction and the cable force testing methods at different construction stages. For the tensioning of suspenders in multi-rib tied-arch bridges, an innovative approach is proposed and adopted: during the tensioning stage, a combined control method is employed, primarily relying on tensioning jacks and corresponding pressure gauges, supplemented by the frequency method; in the non-tensioning stage of the suspenders, a comprehensive control method is used, based on the cable force coefficient calibrated during the tensioning stage and the bending stiffness of the suspenders, with testing conducted via the frequency method. Practical applications have shown that this comprehensive method achieves satisfactory outcomes in controlling the cable forces of suspenders during the construction of multi-rib tied-arch bridges, and it can serve as a reference for cable force control in similar bridges in the future.