分幅不对称索面钢箱梁斜拉桥主梁安装控制

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1、桥梁建设2014年第44卷第3期(总第226期)114BridgeConstruction，Vo1．44，No．3，2014(TotallyNo．226)文章编号：1003—4722(2014)03一O114—06分幅不对称索面钢箱梁斜拉桥主梁安装控制贾少敏，赵雷，卜一之(西南交通大学土木工程学院，四川I成都610031)摘要：针对分幅、不对称索面钢箱梁斜拉桥的结构特点和安装阶段面临的困难，基于几何控制法的原理，以六塔、双幅、空间四索面的嘉绍大桥主航道桥为研究对象，给出了该类桥安装时主梁标高、轴线、横坡的控制方法及操作步骤，即在匹

2、配阶段，通过调整新起吊主梁节段与已安装主梁节段的相对位置来保证主梁线形平顺，使主梁轴线、横坡及2幅主梁间距满足精度要求，又可大幅减小温度及风对施工进度的影响；在斜拉索张拉阶段，通过斜拉索无应力索长的调整，使主梁标高、2幅主梁内侧相对标高满足精度要求，又可方便后续横梁的安装。施工实践表明：嘉绍大桥主航道桥主梁安装顺利，合龙后实测主梁线形平顺，最大标高误差远小于规定的限值。关键词：斜拉桥；钢箱梁；不对称索面；安装控制；几何控制法；误差控制；无应力状态法；线形中图分类号：U448．27；U445．4文献标志码：AErectionCont

3、rolofMainGirderofSteelBoxGirderCable--StayedBridgewithSeparatedDecksandAsymmetricCablePlanesJlAShao-min，ZHA0Lei，BUYi-zhi(SchoolofCivilEngineering，SouthwestJiaotongUniversity，Chengdu610031，China)Abstract：Inviewofthestructuralfeaturesofthesteelboxgirdercable—stayedbridg

4、ewithseparateddecksandasymmetriccableplanesandthedifficultiesthatmaybeconfrontedatthee—rectionstage，themainshipchannelbridgeoftheJiashaoBridgewithsixpylons，separatedtwodecksandspatialfourcableplaneswastakenastheresearchobiect，thecontrolmethodsfortheelevation，axialline

5、andtransverseslopeofthemaingirderofthebridgeofthesametypeattheerectionstageandtherelatedworkingprocedureswereworkedoutbasedontheprincipleofthegeometrycontrolmethod．Specifically，atthematchinganderectionstageofthegirderblocksofthebridge，thesmoothgeometricshapesofthemain

6、girderweretobeguaranteedbyadjustingtherelativepositionsbetweenthenewlyandthepreviouslyinstalledblocks．Theadjustingoftherelativepositionsnotonlycouldmaketheaxiallineandtransverseslopeofthemaingirderandthespacingdistancebetweenthetwodecksmeettheaccuracyrequirements，buta

7、lsocouldreducetheimpactofthetemperaturesandwindontheconstructionprogresstoagreatextent．Atthetensioningstageofthestaycablesofthebridge，byadjustingtheunstressedlengthofthecables，theelevationofthemaingirderandtherelativeelevationoftheinnersidesofthetwodeckscouldbemadetom

8、eettheaccuracyrequirementsandatthesametimetofacilitatethesubsequentin—stallationofthecrossbeams．Theconstructionpracticeshows