预应力等效预压技术在大跨度连续梁施工中的应用研究  

Research on the application of the prestressed equivalent preloading technology in the construction of large-span continuous beams

作　　者：李思维 LI Siwei(China Railway 18th Bureau Group First Engineering Co.,LTD.,Zhuozhou 072750,China)

机构地区：[1]中铁十八局集团第一工程有限公司,河北涿州072750

出　　处：《华北科技学院学报》2025年第1期34-39,68,共7页Journal of North China Institute of Science and Technology

摘　　要：为了提升大跨度连续梁的承载能力和稳定性,减少施工过程中的变形问题,研究预应力等效预压技术在大跨度连续梁施工中的应用情况。以连续梁中的悬臂支架和吊篮为预压对象,计算施工荷载与预压荷载,做好前期准备工作。预应力等效预压技术包含预埋墩顶螺纹钢、拼装预应力等效预压支架、拼装预应力等效预压悬臂、吊篮加载预应力等效预压等步骤,使用有限元软件计算预压后连续梁各项数据变化,以此分析施工效果。试验结果显示,使用预应力等效预压技术后,实际测量支架和吊篮的应力变化与计算结果较为接近,证明预应力等效预压技术的有效性。在采用该技术后,大跨度连续梁施工中的悬臂支架与吊篮的变形量及挠度值均呈现出清晰的线性规律变化。这表明预应力等效预压技术能够精准地控制关键构件的形变,进而在施工过程中优化应力分布状态,有效减少不必要的结构损伤。这一优势不仅确保了大跨度连续梁施工的安全性与结构质量,还显著提升了整体施工效果与效率。In order to improve the bearing capacity and stability of large-span continuous beams and reduce deformation problems during construction,the application of equivalent prestressing technology in the construction of large-span continuous beams is studied.The cantilever support and suspension basket in the continuous beam are used as preloading objects,and the construction load and preloading load are calculated to prepare for the preliminary work.The prestressed equivalent preloading technology includes:embedding the threaded steel at the top of the pier,assembling the prestressed equivalent preloading support,assembling the prestressed equivalent preloading cantilever,and loading the prestressed equivalent preloading with a hanging basket.Finite element software is used to calculate the changes in various data of the continuous beam after preloading,in order to analyze the construction effect.The experimental results show that after using the prestressed equivalent preloading technology,the actual measured stress changes of the support and suspension basket are close to the calculated results,proving the effectiveness of the prestressed equivalent preloading technology.After adopting this technology,the deformation and deflection values of the cantilever support and suspension basket in the construction of large-span continuous beams show clear linear changes.This indicates that the prestressed equivalent preloading technology can accurately control the deformation of key components,thereby optimizing the stress distribution state during construction and effectively reducing unnecessary structural damage.This advantage not only ensures the safety and structural quality of large-span continuous beam construction,but also significantly improves the overall construction effect and efficiency.

关 键 词：预应力 等效预压技术 大跨度 连续梁 变形量 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]