悬索桥AS法架设主缆索股股内误差分析与评定  

Analysis and Evaluation on Internal Error of Main Cable Strand Erection by AS Method for Suspension Bridge

作　　者：谭沸良 唐茂林[2] 谢文昌 TAN Fei-liang;TANG Mao-lin;XIE Wen-chang(Sichuan Jiaoda Engineering Testing Consulting Co.,Ltd.,Chengdu Sichuan 610000,China;Southwest Jiaotong University,Chengdu Sichuan 610000,China;Sichuan Mianjiu Expressway Co.,Ltd.,Mianyang Sichuan 621000,China)

机构地区：[1]四川交大工程检测咨询有限公司,四川成都610000 [2]西南交通大学,四川成都610000 [3]四川绵九高速公路有限责任公司,四川绵阳621000

出　　处：《公路交通科技》2023年第12期89-96,153,共9页Journal of Highway and Transportation Research and Development

基　　金：贵州省交通运输厅2020年度科技项目(2020-122-032);中国交通建设股份有限公司科技研发项目(2019-ZJKJ-12)。

摘　　要：为解决我国山区悬索桥主缆索股运输问题以及减小主缆锚固系统尺寸,考虑主缆架设空中纺丝法(AS法)对位于运输条件差山区、超大跨径的悬索桥建设的适应性,以我国内陆首次采用AS法施工主缆的阳宝山特大桥为依托,对AS法架设主缆索股股内误差进行分析和评定,旨在为国内AS法架设主缆的设计、施工及误差评定标准的制订提供借鉴。通过理论分析和数值模拟,并结合现场实测数据,对AS法架设主缆索股股内误差的主要因素进行定量分析。根据猫道的弹性伸长量和丝股的无应力长度对应关系推导了猫道变形影响误差计算的简化理论公式,分别采用简化公式与数值模拟方法计算阳宝山特大桥索股架设长度。通过现场实测温度并运用统计学原理,分析主缆纺丝过程中索股钢丝温差变化规律。对比分析PPWS法索股误差控制要求,结合现场实施误差控制情况,提出AS法架设索股股内误差的控制标准。结果表明:索股股内误差的主要影响因素是猫道变形和索股钢丝温差;采用简化公式计算索股架设长度,与采用数值模拟方法计算结果的误差在可接受范围内,能快速获取猫道初步设计及架设过程调整参数;计算温度变化影响误差时索股纺丝温差取值与主缆跨度成相对正比例关系,不同跨度悬索桥可根据主缆跨度按比例取值;根据不同桥梁跨径,AS法架设索股股内误差的控制标准可按不超过5%取值。In order to solve the transportation problem and to reduce the size of the anchorage system of main cable strands in mountainous suspension bridge,considering the adaptability of air spinning method(AS method)for the construction of suspension bridges located in mountainous areas with poor transportation conditions and large span,the internal error of main cable strands by AS method for suspension bridges is analyzed and evaluated based on Yangbaoshan grand bridge,which is the first bridge in China Mainland by using AS method for main cable construction and provides reference for the design,construction and error evaluation standard for suspension bridges by AS method.Based on theoretical analysis,numerical simulation and on-site measurement data,the main factors affecting the internal strand errors of the AS main cable quantitative analysis are investigated.According to the relationship between the elastic elongation of the catwalk and the stress-free length of the strand,a simplified theoretical formula for calculating the influencing error of catwalk deformation is derived,simplified formula and numerical simulation method are used to calculate the length of cable strands of Yangbaoshan grand bridge.The variation rule of temperature difference of cable strand steel wire during main cable spinning is analyzed by means of field temperature measurement and statistical principle.By comparing and analyzing the requirements of error control of PPWS cable strand and combining with the actual situation of error control,the control standard of internal error of cable strand by AS method is put forward.The result shows that(1)the main factors affecting the internal error of cable strands are the deformation of catwalk and the temperature difference of cable strands;(2)the error between the simplified formula and the numerical simulation method is within the acceptable range,that can quickly obtain the parameters of the initial design and the adjustment of the erection process;(3)the influencing error of calculation temp

关 键 词：桥梁工程 主缆架设 AS法 索股误差 误差评定 

分 类 号：U445.46[建筑科学—桥梁与隧道工程]