某悬索斜拉索组合式跨越管桥的换索设计

发布时间：2018-02-26 13:23

本文关键词： 悬索斜拉索组合式桥跨越管桥主缆吊索斜拉索更换设计有限元法　出处：《桥梁建设》2017年02期 　论文类型：期刊论文

【摘要】：某(320+500+225)m悬索斜拉索组合式跨越管桥,运营多年后索结构出现防腐保护层老化、破损,钢丝锈蚀严重,索体松弛等病害。为保障管桥结构和运营安全,对全桥主缆、吊索及斜拉索进行更换设计。新索全部采用镀锌钢丝绳。采用整体置换法更换主缆,在锚固墩和塔顶设计新主缆通道,按设计空缆线形架设新主缆;采用单根置换法更换所有吊索,新主缆逐步替代旧主缆;采用单根置换法更换斜拉索,从桥塔向跨中逐根进行,北塔和南塔同步;所有缆索更换完后,进一步调整索力和线形;最后参照公路桥梁缆索的防腐技术对所有新索进行防腐处理,并拆除旧主缆。采用MIDAS Civil 2012进行换索计算,结果表明结构受力均满足规范要求。该管桥已于2015年底成功完成换索,目前运营情况良好。
[Abstract]:In order to ensure the safety of the structure and operation of the pipe bridge, the cable structure of a certain 320 500225m suspension cable-stayed composite crossing pipe bridge has been damaged by corrosion protection layer, damaged steel wire, serious corrosion of steel wire and relaxation of cable body after many years of operation, etc. In order to ensure the safety of the structure and operation of the pipe bridge, the main cable of the whole bridge is protected. The new cable is replaced by galvanized wire rope, the main cable is replaced by the integral replacement method, the new main cable passage is designed at the anchor pier and tower top, and the new main cable is erected according to the design of the empty cable line. The single replacement method is used to replace all the sling cables, the new main cable replaces the old cable step by step, the single replacement method is used to replace the stay cables, from the bridge tower to the middle span one by one, the north tower and the south tower are synchronized; after all the cables are replaced, the cable force and the line shape are further adjusted; Finally, referring to the anticorrosion technology of highway bridge cable, all new cables are treated with anticorrosion, and old main cables are removed. The calculation of changing cable by MIDAS Civil 2012 shows that the structural forces all meet the requirements of the specification. The pipe bridge has successfully completed the cable exchange in end of 2015. At present, the operation is in good condition.
【作者单位】：中交第二公路勘察设计研究院有限公司;
【分类号】：U442.5

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