合福铁路铜陵长江大桥3号墩沉井精确着床控制技术

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1、桥梁建设2013年第43卷第1期(总第218期)BridgeConstruction，Vo1．43，No．1，2013(TotallyNo．218)9文章编号：1003—4722(2013)01—0009—06合福铁路铜陵长江大桥3号墩沉井精确着床控制技术覃勇刚，涂满明，王东辉(中铁大桥局股份有限公司设计分公司，湖北武汉430050)摘要：合福铁路铜陵长江大桥主桥为主跨630m的三索面钢桁梁斜拉桥，其北桥塔3号墩采用圆端形沉井基础，沉井着床采用“二次定位、注水快速着床”的方案。为使沉井精确着床，采用MIDAS2006有限元软件建立沉井和拉缆系统空间模型，模拟沉井着床过程，分

2、析沉井着床过程中的偏移及拉缆索力变化规律，确定定位时沉井底与河床的距离为2m。为减小冲刷、河床平面土质分布不均、波浪和涡激振动等对沉井精确着床的影响，分别采取了注水快速着床、绞锚纠偏回位、增加沉井边锚数量、增加边锚刚度、增加沉井质量或阻尼等措施。关键词：斜拉桥；基础；沉井；控制；桥梁施工中图分类号：U448．27；U443．131文献标志码：AControlTechniqueforAccurateLandingofCaissonofPierNo．3ofTonglingChangjiangRiverBridge0nHefei-FuzhouRailwayontoRiverbed

3、QINlong—gang，TuMan—raing，WANGDong—hui(DesignCompany，ChinaRailwayMajorBridgeEngineering，Inc．，Wuhan430050，China)Abstract：ThemainbridgeofTonglingChangjiangRiverBridgeonHefei—FuzhouRailwayisasteeltrussgirdercable—stayedbridgewiththreecableplanesandwithamainspan630m．ThePierNo．3ofthenorthpylonof

4、thebridgeissupportedonthefoundationofround—endedcaissonthatwasconstructedbytheschemeof”tWO—timepositioningandquicklandingofthecaissonontotheriverbedbywaterpumping”．Tomakesurethatthecaissoncouldbeaccurately1andedontotheriverbed，thespatialmodelforthecaissonanditstieanchorropesystemwassetupby

5、thefiniteelementsoftwareMIDAS2006，theprocessofthelandingofthecaissonwassimulated，thechanginglawsofthecaissonoffsettingandanchorropeforcesintheprocessofthelandingwereanalyzedanditwasdeterminedthatthedistancebetweenthebottomofthecaissonandtheriver—bedshouldbekept2matthetimethecaissonwasbeing

6、positioned．Tominimizetheinfluencesofthescouring，soilnon—uniformityoftheriverbed，wavesandvortexvibrationontheaccuratelandingofthecaissonontotheriverbed，themeasuresofpumpingwaterintothecaissonforquicklandingofthecaisson，rectifyingtheoffsettingofthecaissonbywinchingtheanchors，increasingthenum

7、bersandrigidityofthesideanchorsofthecaissonandincreasingthemassanddampingofthecaissonitselfwererespectivelytaken．Keywords：cable—stayedbridge；foundation；caisson；control；bridgeconstruction1工程概况为4线铁路(合肥至福州客运专线铁路双线和合肥合福铁路铜陵长江大桥主桥为(90+240+至铜陵I级铁路双线)，上层为6车道高速公路。北630