运营期钢绞线斜拉索索套管适应性调整关键技术  

Key Techniques for Adaptability Adjustment of Steel Strand Cable Sleeves during Operation

作　　者：赵金磊 刘力 ZHAO Jinlei;LIU Li(Anhui Traffic Control Group Construction Company,Hefei 230088;China Railway Bridge Research Technology Company,Wuhan 430034)

机构地区：[1]安徽交控集团建设公司,合肥230088 [2]中铁桥研科技有限公司,武汉430034

出　　处：《公路交通技术》2024年第2期150-156,共7页Technology of Highway and Transport

摘　　要：为解决钢绞线斜拉桥运营过程中索套管变形过大、塔端露出延伸管,影响钢绞线耐久性等问题,提出将传统的伸缩端从布设在塔端调整为梁端的方案,以减小索套管在自重和温差组合效应下的伸缩长度,使拉索结构趋于稳定,并依托某主跨806 m的双塔四索面全漂浮体系斜拉桥用于现场工程改造实践。工程应用表明:1)采用新方案后索套管线形明显平顺,塔端作为固定端杜绝了索套管运营过程中脱离延伸管的风险,梁端布设伸缩装置可方便后期的养护维修;2)梁端索套管可作为后期钢绞线检查窗口,并起到防火护套的作用,避免车辆火灾导致的斜拉索损伤,提高了拉索结构的整体耐久性;3)该优化方案及相应的施工技术可供同类桥梁索套管的病害处理参考。In order to solve the problems of excessive deformation of the cable casing and the exposure of the extension pipe at the tower end during the operation of the steel strand cable-stayed bridge,which affects the durability of the steel strand,it is proposed to adjust the traditional telescopic end from the tower end to the beam end to reduce the expansion and contraction length of the cable casing under the combined effect of self-weight and temperature difference,so that the cable structure tends to be stable,and an on-site engineering transformation practice is relied on a double-tower four-cable surface full-floating cable-stayed bridge with a main span of 806 m.The engineering application shows that:1)after adopting the new scheme,the linear shape of the cable sleeve is obviously smooth,the tower end is used as the fixed end to eliminate the risk of the cable sleeve breaking away from the extension pipe during operation,and the expansion device at the beam end can facilitate the later maintenance and maintenance;2)The beam end cable casing can be used as a steel strand inspection window in the later stage,and plays the role of fire sheath,avoiding the damage of the cable-stayed cable caused by vehicle fire,and improving the overall durability of the cable structure;3)The optimization scheme and the corresponding construction technology can be used as a reference for the disease treatment of similar bridge cable casings.

关 键 词：斜拉桥 钢绞线斜拉索 索套管 温度伸缩 养护维修 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]