AS法悬索桥锚靴及拉杆锚固可靠性研究  

Study on Anchorage Reliability for Strand Shoe and Pull Rod of Air‑Spinning Suspension Bridge

作　　者：黄安明 杨博[2] 陈龙 谢俊 陈鑫[3] HUANG Anming;YANG Bo;CHEN Long;XIE Jun;CHEN Xin(Deyang Tengen Heavy Industry Co.,Ltd.,Deyang,Sichuan 618000,China;CCCC Second Highway Engineering Co.,Ltd.,Xi'an,Shaanxi 710000,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China)

机构地区：[1]德阳天元重工股份有限公司,四川德阳618000 [2]中交第二公路工程局有限公司,陕西西安710000 [3]西南交通大学土木工程学院,四川成都610031

出　　处：《中外公路》2024年第1期133-140,共8页Journal of China & Foreign Highway

基　　金：贵州省交通运输厅科技项目(编号:2020⁃122⁃032)。

摘　　要：AS法(空中纺线法)施工的悬索桥,主缆各索股钢丝套接锚固在两岸的锚靴上,锚靴通过拉杆将索股力传递给锚固系统。锚靴与主缆钢丝相互作用后锚靴的承载能力、钢丝小曲率弯折后的应力状态、拉杆安装精度对锚固可靠性的影响均需要定性定量的研究以及试验验证。该文以AS法架设主缆悬索桥——阳宝山特大桥为背景,对锚靴及索股进行了6 150 kN设计荷载下拉杆无偏转状态、拉杆相对于锚固垫板在水平向、竖直向和45°向偏转0.5°共4种工况下的试验研究。结果表明:锚靴承载能力满足设计要求,钢丝小曲率弯折后无异常变形和破坏;锚靴及拉杆构造连接可靠,装配性好,构造采用球面垫圈结构可以保证拉杆具备约1°偏心调节能力,为保证锚靴及拉杆构造设计使用要求,建议拉杆与索股轴向安装控制精度保证在0.5°以内。Each strand wire of the main cable in the suspension bridge constructed by the AS method is sleeved and anchored on the strand shoes on both banks.The strand shoe transmits the strand force to the anchoring system through the pull rod.The bearing capacity of the strand shoe after the interaction between the strand shoe and the wires of the main cable,the stress state of the wires after small curvature bending,and the influence of installation accuracy of the pull rod on the anchoring reliability all need to be qualitatively and quantitatively studied and verified by the experiment.In this paper,the main cable suspension bridge constructed by the AS method,namely Yangbaoshan Bridge,was studied,and experimental studies were carried out on the strand shoe and strand under the four working conditions:design load of 6150 kN in the normal pull rod condition,as well as 0.5°deflection of the pull rod relative to the anchor plate in the horizontal direction,vertical direction,and 45°direction.The results show that the bearing capacity of the strand shoe meets the design requirements.There is no abnormal deformation or damage after the wire bends with a small curvature.The strand shoe and pull rod are connected reliably and have good assembly performance.The spherical washer structure can ensure that the pull rods have an eccentric adjustment ability of about 1°.In order to ensure the design and use requirements of the strand shoe and pull rod are met,it is suggested that the axial installation control precision of pull rods and strands should be maintained within 0.5°.

关 键 词：桥梁工程 AS法悬索桥 主缆 锚靴 拉杆 性能试验 安装精度 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]