基于无应力状态法的悬臂施工桥梁远端控制技术

Bridge Remote Control Technology for Cantilever Construction Based on the Sress-free State Method

济宁市京杭运河新建辅道桥主桥采用连续梁桥悬臂拼装施工,施工控制是分阶段成形桥梁施工控制的重点和难点,钢梁线形控制精度要求高,在现场拼装时需要保证成桥平面与竖曲线线形,控制难度大。文章分析了传统施工控制方法的不足与无应力状态法的应用原理。采用桥梁专用有限元软件Midas Civil进行施工前有限元仿真计算。基于无应力状态法理论提出了通过远端调节方法实现悬臂拼装快速合拢的方法,降低施工控制难度,加快进度提高效率。

The main bridge of the newly-built auxiliary road bridge of the Beijing-Hangzhou Canal in Jining City adopts continuous bridge cantilever assembly construction.Construction control is the key and difficult point of the construction control of the shaped bridge in stages,the requirements of steel beam linear control accuracy are high,it is necessary to ensure the plane and vertical curve linear shape of the finished bridge when assembling on site,so it is difficult to control.This paper analyzes the shortcomings of traditional construction control methods and the application principle of the stress-free state method,uses Midas Civil,a special finite element software for bridges,to carry out finite element simulation calculation before construction,and proposes a method to realize the rapid closing of cantilever assembly through the remote adjustment method based on the theory of the stress-free state method,so as to reduce the difficulty of construction control,accelerate progress and improve efficiency.