节段预制悬臂拼装连续梁线形控制技术与实施

Linear Control Technology and Implementation of Segmental Precast Cantilever Assembly Continuous Beam

针对悬臂拼装短线法预制、施工、合龙段线形控制难度大、精度要求高的问题,结合郑州东四环快速化工程项目节段预制悬臂拼装连续梁桥施工实例,基于精细化有限元分析与短线法理论,提出了施工线形及多种纠偏措施的主梁线控技术。通过精细化分析与现场实测数据的对比,提出不同的线形纠偏方案,并选取合适方法对悬臂拼装连续梁的线形进行有效控制,最后经过线形控制及纠偏得到良好的合龙线形。研究表明,运用空间三维坐标转换原理,得到理论安装线形,通过有限元施工阶段模拟,可为悬臂拼装节段梁的受力及线形参数提供参考;结合不同方法的特点充分利用各方法的优点共同控制线形变化,有效提高线形控制的精度和灵活性。

Aiming at the requirements of difficult linear control and high precision in the precast,construction and closure segments of cantilever assembly short-line method,combined with the case of constructing the segmental precast cantilever assembly continuous beam bridge of East Fourth Ring Expressway in Zhengzhou city,and based on refined finite element analysis and short-line method theory,the main beam linear control technology of construction alignment and various corrective measures was proposed in the research.Through the comparison of refined analysis and field measured data,different alignment rectification schemes were proposed,and the appropriate method was selected to effectively control the alignment of cantilever assembled continuous beams.Finally,better closure alignment was obtained through alignment control and rectification.The research shows that the theoretical installation alignment can be obtained by using the space three-dimensional coordinate transformation principle,and the finite element construction stage simulation can provide reference for the stress and alignment parameters of cantilever segmental beam.Combined with the characteristics of different methods to make full use of advantages of each method to control line shape change,it can effectively improve the accuracy and flexibility of linear control.