TheDesignofSteelCofferdamCrane(Sets)BoxforConstructionofPileCapsinDeepWater桥梁深水承台施工双壁钢吊(套)箱围堰设计摘要近年来我国修建了不少跨越大江大河甚至跨越海湾的深水基础，取得了很大的成绩。桥梁深水基础往往处于水深流急，地质条件极其复杂的环境，修建深水基础时采用的防水技术一般就是围堰和钢吊箱。双壁钢围堰具有结构强度高，防水性能好的特点，在桥梁深水基础中得到了广泛应用，并且它能承受较大的水压力，结构简单，施工简便。本设计就是对围堰进行结构和施工的设计。根据承台尺寸()及水深()拟定围堰结构尺寸，在不同的施工工况荷载作用下对围堰的刃脚、壁板、竖肋、隔舱板、水平桁架等围堰各组成部分进行受力分析和验算，若不合格重新拟定尺寸，然后运用MIDAS有限元分析软件对围堰建模进行整体计算并将结果与手算结果进行对比分析，最后合理确定围堰分节下沉的施工方案。关键词：深水基础双壁钢围堰有限元分析施工方案AbstractInrecentyearsmanydeepwaterfoundationsovercrossinggreatriverseventhebayareconstructedinChinaandreachgreatachievement.Bridgedeepwaterfoundationisusuallyintheenvironmentofdeepwater,torrentandcomplicatedgeographiccondition.Atthegeneralsituationcofferdamandsteelhangingboxareusedtoconstructthedeepwaterfoundationswiththefunctionofwaterproofperformance.Thedouble-wallsteelcofferdamiswidelyappliedinbridgedeepwaterfoundationduetothatitisofcharacteristicsofhighstructuralstrengthandgoodwaterproofperformanceandthedouble-wallsteelcofferdamcanbearmajorwaterpressurewithsimplestructureandconvenientconstruction.Thecontentofthispaperisthedesignofstructureandconstructionofconfferdam.Thestructuraldimensionofconfferdamisdecidedaccordingtothecapsize()andthedepthofwater().Thestressofcomponentofcofferdamincludingedgefoot,wainscot,verticalstiffeningrib,compartment,horizontaltrussareanalyzedandcheckedupundertheactionofdifferentconstructionbehaviourloads.Thedimensionmustbestudyoutagainifthestressischekeduptobeineligible.ThefiniteelementanalysissoftwareMIDASisusedtomodeltheconfferdamforholisticcomputation,thentheresultiscomparedwiththeresultofmanualcalculationsforcontrastiveanalysis.Finallytheconstructionschemeofsteppedsubsidingisdeterminedinreason.Keywords:deepwaterfoundationsdouble-wallsteelconfferdamfiniteelementanalysisconstructionscheme目录第1章绪论..........................................................................................................................11.1国内外现状.................................................................................................................11.2工程背景.....................................................................................................................41.3钢围堰施工工艺简介.................................................................................................51.4双壁钢围堰受力分析.................................................................................................8第2章围堰结构设计——结构力学方法..........................................................................92.1围堰构造.....................................................................................................................92.2设计荷载...................................................................................................................102.2.1荷载种类.............................................................................................................102.2.1.1流水压力............................................................................
