摘要
国家大跨越输电线路建设方兴未艾,这些新建的长距离电力输送通道档距大且铁塔高,同时面临恶劣环境的严峻挑战。在大跨越超高输电铁塔的施工中,双平臂抱杆是最重要的吊装施工装备。在施工期内高空作业的双平臂抱杆面临复杂的风环境,高长细比的柔性结构特征也对其抗风安全提出了更高的要求。针对组立江阴长江大跨越385 m高塔的双平臂抱杆,开展了高频天平测力风洞试验研究。在多个来流风向角下,针对各个抱杆构件的多种工作姿态完成了高频天平测力试验。由风洞试验可知:抱杆标准节整体体型系数在各风向角下的变化存在线性规律;抱杆整体结构体型系数的规范取值会偏于风险,应在抱杆结构抗风验算中予以重视。同时,还提出了基于构件总计法的抱杆标准节风荷载精细化计算方法。
The construction of long-span power transmission lines in China is booming.These transmission lines run through large distances with high-rise towers,and are facing severe challenges from harsh environments.For construction of long-span and ultra high-rise transmission towers,the crane structure with double-flat-arm derrick has become the most important lifting equipment.During the construction process,the crane operates has to face the complex and extreme wind environment.The crane structure with a large slenderness ratio is quite wind-sensitive.Wind tunnel tests were carried out for the double-flat-arm derrick for erecting the 385 m high tower crossing the Yangtze River in Jiangyin.High-frequency force-balance wind tunnel tests were conducted for different working positions of flat arms under various incoming wind angles.The obtained shape coefficients of the standard tower body segment exihibited a linear relation with the incoming wind angles.It was also found that the overall shape coefficients of the crane structure obtained by the code might be risky,and should be paid more attention to the wind resistance calculation of the derrick structure.A refined wind loading calculation formula was proposed based on the member assembly method.
作者
夏顺俊
赵俊
马龙
张仁强
戴如章
李锡民
XIA Shunjun;ZHAO Jun;MA Long;ZHANG Renqiang;DAI Ruzhang;LI Ximin(Jiangsu Electric Power Transmission&Transformation Corporation,Nanjing 210028,China)
出处
《工业建筑》
北大核心
2023年第4期1-7,74,共8页
Industrial Construction
基金
国网江苏省电力有限公司500千伏凤城—梅里长江大跨越工程超大型组塔双平臂抱杆系统研制及应用科技项目(SGJSJSOOXMJS2000254)。
关键词
抱杆结构
超高输电铁塔
风洞试验
体型系数
构件总计法
crane structure
ultra high-rise tower
wind tunnel test
shape coefficient
member assembly method
