深中通道桥梁工程环氧钢绞线张拉用限位板的张拉限位距离  

Research on Limiting Distance of Prestressing Using Limiting Plates for Epoxy-Coated Steel Strandin the Shen-Zhong Channel Bridge Project

作　　者：陈炳耀 陈善行 CHEN Bingyao;CHEN Shanxing(Guangdong Bay Area Transportation Construction Investment Co.,Ltd.,Guangzhou Guangdong 511455,China;Guangdong Shengxiang Traffic Engineering Testing Co.,Ltd.,Guangzhou Guangdong 511400,China)

机构地区：[1]广东湾区交通建设投资有限公司,广东广州511455 [2]广东盛翔交通工程检测有限公司,广东广州511400

出　　处：《广东公路交通》2024年第2期41-47,共7页Guangdong Highway Communications

摘　　要：以深中通道项目的桥梁工程为对象,针对环氧钢绞线的张拉施工,通过理论分析、室内试验和现场检测,围绕限位板的限位距离对锚口摩阻及预应力损失的影响进行了分析。首先分析了锚具系统锚口摩阻的构成和影响因素,通过试验数据和理论计算验证了不同限位距离对锚口摩阻损失和钢绞线回缩损失的影响;然后通过计算与在实际桥梁工程中进行试验,对比了不同限位距离下钢绞线的磨损情况及锚下有效预应力值,得出了限位距离为12mm时张拉本项目的单丝环氧钢绞线能够有效降低预应力损失的结论;最后总结了分析结果,并提出了在深中通道桥梁工程中使用限位距离为12mm的限位板进行环氧钢绞线张拉的建议,为类似工程的预应力施工提供实践经验。In this paper,taking ShenZhong Channel Project as the research object,focusing on the tensioning construction of epoxy-coated steel strands,through theoretical analysis,indoor experiments and in-situ inspections,the impact of the limiting plate distance on anchor pocket friction and prestressing loss has been deeply studied.Firstly,the composition and influencing factors of anchor pocket friction in the anchorage system have been analyzed.Then,the influence of different limiting distances on anchor pocket friction loss and steel strand relaxation loss has been verified through experimental data and theoretical calculations.Subsequently,through calculations and experiments in actual bridge engineering,the wear condition of steel strands and the effective prestressing value under the anchor have been compared at different limiting distances.The conclusion has been drawn that a limiting distance of 12mm can effectively reduce prestressing loss when tensioning single-strand epoxy-coated steel strands in this project.Finally,in this paper,the research results have been summed up,the recommendation of using a limiting plate with a distance of 12mm for tensioning epoxy-coated steel strands in ShenZhong Channel Project has been proposed,which could provide scientific theoretical basis and practical guidance for similar prestressed construction projects.

关 键 词：桥梁工程 环氧钢绞线 预应力张拉 限位距离 预应力损失 

分 类 号：U445.471[建筑科学—桥梁与隧道工程]