嘉绍跨江大桥双壁钢吊箱围堰施工

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1、嘉绍跨江大桥双壁钢吊箱围堰施工代强波，钟海，周爱兵33文章编号：1003—4722(2010)S1—0033—03嘉绍跨江大桥双壁钢吊箱围堰施工代强波，钟海，周爱兵(1．中铁大桥局嘉绍跨江大桥项目经理部，浙江海宁314415；2．嘉绍跨江大桥工程建设指挥部，浙江绍兴312366)摘要：嘉绍跨江大桥北副航道桥为四跨连续刚构桥，采用群桩承台基础。根据钱塘江特殊的水文地质条件，采用双壁钢吊箱围堰作为基础施工的挡水结构，兼做承台施工的模板。围堰在后场分块制作，现场拼装成整体后，采用4台100t液压千斤顶下放围堰到设计标高，围堰下放到位后进行围堰封底和抽水施工。为保证涌潮冲刷下围堰的下放安全、封底混凝

2、土浇筑，在围堰侧板上焊接2层围堰导向、在底板布置8个撑杆螺丝以加强横向稳定。目前已有8个围堰完成封底并进行了承台施工，围堰拼装及下放后平面位置偏差符合规范要求，封底一次成功且围堰均不漏水。关键词：桥梁基础；双壁钢吊箱围堰；桥梁施工中图分类号：U445．556文献标志码：AConstructionofDouble--WallSteelSuspensionCofferdamsforJiashaoBridgeDAIQiang—bo，ZHONGHai。，ZHOUAi—bing(1．SectionofJiashaoRiver-CrossingBridgeConstructionProject，Chin

3、aRailwayMajorBridgeEngineeringGroupCo．，Itd．，Haining314415，China；2．ConstructionHead—quartersofJiashaoRive卜Cr0ssingBridgeProject，Shaoxing312366，China)Abstract：ThenorthauxiliaryshippingchannelbridgeoftheJiashaoBridgeisa4-spancon—tinuousrigid—framebridgeemployinggroupboredpileandpilecapfoundations．Inth

4、elightofthespecialhydrologicandgeologicconditionsoftheQiantangJiangRiveratthebridgesite，thedoub—le—wallsteelsuspensioncofferdamsareusedasthewaterretainingstructuresthatatthesameserveastheformworkforthepilecapsintheconstructionotthefoundations．AcofferdamsiSfabricatedinsectionsandiSassembledintoanint

5、egrityinfield．ThecofferdamiSthenloweredtothedesignedelevationby4setsof100一thydraulicjacks．Afterthecofferdamissetinplace，thecofferdambaseissealedbytremieconcreteandthewaterinsidethecofferdamispumpedout．Toensurethesafetyofloweringofthecofferdamandcastingofthetremieconcreteunderstrongtideandscouring，t

6、hetransversestabilityofthecofferdamisreinforcedbyinstalling2levelsofguid—ingdevicesonthesideplatesand8strutboltsonthebottomplate．Atpresent，thebasesealingof8cofferdamshasbeencompletedandtheconstructionofpilecapshasbeencarriedout．Thedeviationsoftheplanpositionsoftheassembledandloweredcofferdamscancom

7、plywiththerel—evantrequirementsinthetechnicalspecification．Thebasesealingofacofferdamissuccessfullycompletedinonetimeandnowaterleakageproblemhasbeenfound．Keywords：bridgefoundation；double—wallsteelsuspension