大跨度三塔悬索桥主缆系统施工技术创新及改进

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1、桥梁建设2015年第45卷第1期(总第230期)BridgeConstruction，Vo1．45，No．1，2015(TotallyNo．230)文章编号：1003—4722(2015)01—0006—07大跨度三塔悬索桥主缆系统施工技术创新及改进叶觉明(中铁大桥局集团桥科院有限公司，湖北武汉430034)摘要：针对大跨度悬索桥主缆系统施工存在的一些技术难题，介绍近年国内3座三塔悬索桥主缆系统施工技术方面所做的创新和改进。通过使主索鞍底面在底板上直接滑移，简化主索鞍滑动副结构，方便施工过程索鞍顸推；设计制造支座型散索鞍结构，改善散索鞍摆动性能；采用左右对

2、合的双吊耳板索夹结构，改善索夹结构受力性能；采用了主缆PPWS索股水平成盘放索架设方法，减少PPWS索股架设“呼啦圈”和散股问题。针对索鞍槽和主缆索股的抗滑移问题，探索应用了中塔主索鞍加厚鞍槽隔板和91丝规格PPWS索股增加“填充钢丝”的密实整形入鞍等方法。关键词：公路桥；三塔悬索桥；主缆架设；索鞍滑移；索股安装；索夹；水平成盘放索；桥梁施工中图分类号：U448．25；U443．38文献标志码：AInnovationandImprovementofConstructionTechniquesforMainCableSystemsofLongSpanThre

3、e。-TowerSuspensionBridgesYEdue—ming(BridgeScienceResearchInstituteLtd．，ChinaRailwayMajorBridgeEngineeringGroup，Wuhan430034，China)Abstract：InthelightofsometechnicalproblemsexistingintheconstructionofthemaincablesystemsofIongspansuspensionbridges，theinnovationandimprovementhavingbee

4、nmadeintherecentyearsfortheconstructiontechniquesforthethreelongspanthree—towersuspensionbridgesinChinaarepresented．Byslidingthebottomofatowersaddleofthethree-towersuspensionbridgesdirectlyonthebaseplateofthesaddle，theslidingsetstructureforthesaddleissimplifiedandthepushingofthesa

5、ddleintheconstructionishencefacilitated．Thebearingtypesplaysaddleisdesignedandfabricatedandthependulatingfunctionofthesaddleisimproved．Theapplicationofthedoubleliftingearplatescablebandofleftandrighthalvesimprovesthemechanicalbehaviorofthecableband．Themethodoferectingtheprefabrica

6、tedparalle1wirestrands(PPWS)forthemaincable．usingthehorizontallyPPWSunreelingineachreelminimizestheproblemsofthePP—WShulahoopingandlooseningintheerection．TocopewiththeproblemofslidingresistanceofthePPWSinthetowersaddletrough，themethodofdenselyreshapingandsettingthePPWSintheinterme

7、diatetowersaddlebythickeningthesaddletroughpartitionplatesandbyaddingthe“fillerwires”tothePPWSof91wireshasbeenstudiedandapplied．Keywords：highwaybridge；three—towersuspensionbridge；maincableerection；saddleslid—ing；PPWSerection；cableband；horizontallyPPWSunreelingineachreel；bridgecons

8、truction1概述桥(2012年建成)和马鞍山长江公路大桥(2