大吨位斜拉桥钢主塔竖转施工技术研究与应用

Research and Application of Vertical Rotation Construction Technology for Steel Main Pylons of Large-tonnage Cable-stayed Bridges

摘要:

针对合肥市龙岗路跨南淝河特大桥2 450 t钢主塔竖转工程，重点研究竖转专项方案中的力学计算体系，通过转体系统受力分析、液压同步提升参数设计和动态监控方法，解决了超大荷载转体稳定性难题。通过建立桥梁钢主塔竖转整体模型，分析集中荷载效应最不利施工状态，并据此建立主塔转铰分析模型，分析其局部受力性能，同时结合有限元仿真与现场实测数据，验证了“格构压杆+液压控制”体系的可靠性，为同类工程提供力学计算范式与施工控制参数参考。

Abstract:

For the vertical rotation project of the 2 450-t steel main pylon of the Longgang Road Bridge over the Nanfei River in Hefei City, the mechanical calculation system in the special vertical rotation scheme is specially studied. Through the force analysis of the rotation system, the parameter design of hydraulic synchronous lifting, and the dynamic monitoring method, the problem of the stability of the super-large load rotation is solved. An overall model of the vertical rotation of the steel main pylon of the bridge is established to analyze the most unfavorable construction state of the concentrated load effect. Based on this, an analysis model of the main pylon rotation hinge is established to analyze its local mechanical performance. Combined with the finite element simulation and on-site measured data, the reliability of the “lattice compression bar + hydraulic control” system is verified, providing a mechanical calculation paradigm and construction control parameters for similar projects.