某悬索斜拉索组合式跨越管桥的换索设计.pdf

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1、桥梁建设２０１７年第４７卷第２期（总第２４３期）BridgeConstruction，Vol．４７，No．２，２０１７（TotallyNo．２４３）９５文章编号：１００３－４７２２（２０１７）０２－００９５－０５某悬索斜拉索组合式跨越管桥的换索设计高洪波，丁志凯（中交第二公路勘察设计研究院有限公司，湖北武汉４３００５２）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

2、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MIDASCivil２０１２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。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；有限元法中图分类号：U４４８．１９；U４４５．７文献标志码：ADesignofCa

3、bleReplacementofaCombinedCable‐StayedandSuspensionPipelineBridgeGAOHongbo，DINGZhikai‐‐（CCCCSecondHighwayConsultantsCo．，Ltd．，Wuhan４３００５２，China）Abstract：Thedeteriorationsliketheaginganddamageofthecorrosionprotectionlayers，se‐vererustofthesteelwiresandrelaxationofthecablesthemselvesha

4、veoccurredinthecablestruc‐turesofacombinedcable‐stayedandsuspensionpipelinebridgewithspanarrangement（３２０＋５００＋２２５）mafteryearsofoperationofthebridge．Toensurethestructuralandoperationsafetyofthebridge，thereplacementoftheexistingmaincables，slingsandstaycablesofthewholebridgewasdesigned

5、andforallthenewcablestoreplacetheexistingones，thegalvanizedsteelwireropeswereused．Themaincableswerereplaced，usingtheintegralreplacementmethod．Atthetopsoftheanchorpiersandtowers，thenewmaincableaccessesweredesignedandthenewcableswereinstalledaccordingtothedesignedgeometricshapesofthe

6、emptyloadcables．Alltheslingswerereplacedslingbyslingandthenewmaincablesweretoreplacetheexistingonesgradually．Thestaycableswerereplacedcablebycablefromthetowerstowardsthemidspanandsynchronouslyfromthetowersonboththenorthandsouthsides．Afterallthecableswerereplaced，theforcesandgeometr

7、icshapesofthenewcableswerefurtheradjustedandfinally，thecorrosionprotectionforthenewcableswastreatedwithreferencetothecorrosionprotectiontechniquesforthecablesofhighwaybridgesandtheexistingmaincableswerethencompletelyremovedaway．TheMIDASCivil２０１２wasusedinthecalculationofthecablerepl

8、acementandtheresultsofthec