沈阳变压器集团有限公司联合厂房桩基础工程设计

摘要本次设计题目来源于沈阳特变电工联合厂房基础工程。设计首先将调研中收集到的沈阳特变电工联合厂房的地质勘察报告、上部建筑结构情况及相关技术的国内外资料进行综合分析，严格遵循《建筑桩基技术规范》(JGJ94-94)并结合地方经验初步拟定了沉管灌注桩，螺旋钻孔压灌混凝土桩基础，钢筋混凝土预制桩三种桩基础设计方案。然后对此三种基础方案进行了初步的设计计算，计算出其工程量，得出各自主要工程项目的概预算。本设计进而通过对拟选方案的技术可行性、经济合理性、工程可靠性三方面综合分析，最终确定螺旋钻孔压灌混凝土桩基础为最佳设计方案，并按优选方案进行工程量及参数设计计算。具体优化参数与概预算总结：选择第五层中粗砂为桩端持力层。桩长为L＝20m。桩径为φ600mm，桩身采用C25的混凝土，桩身主筋为8φ18，箍筋为φ8@120。承台底面埋深为1.5m。桩基础的A承台平面尺寸为3×1.2m2，B承台平面尺寸为3×3m2。螺旋钻孔混凝土压灌桩桩基础含税工程总造价为：821378.38元，相比可知，优选方案较其他方案工程造价将近节省10万元，基本达到优化设计的目的。最后，根据优化方案完成了铁芯车间桩基础工程的施工技术方案和工程质量检测的设计工作。在设计的主要工作及结论部分，本人对设计过程中所获得的主要数据成果进行了分析总结。另外，此次设计的最大特点是将整个设计阶段遇到的最为重要的几个问题单独提出并分析进而表述了自己的见解。关键词沉管灌注桩螺旋钻孔压灌混凝土桩钢筋混凝土预制桩方案优化AbstractThedesignoftopicisfromtheShenyangjointspecialvariableelectricalplantpilefoundationworksThedesignwillfirstanalysizethecollectedmaterialsoftheGeologicalSurveyreportofShenyangspecialvariablelyelectricalJointplant,theupperstructureinformationanddomesticandforeignmaterialsofrelatedtechnology.AndthedesignisabidebytheConstructionPileTechnicalSpecifications(JGJ94-94)strictlycombinedwithlocalexperienceintheinitialdevelopmentofthethreepilefoundationdesignofimmersedtubepiles,screwdrilledgrout-cast-in-situpileandprecastreinforcedconcretepilesSecondly,thisprogrammearebasedonthepreliminarydesign,andcalculatetheamountoftheirworksandtheirbudget.ThenIwillcomparethesethreeprogrammesinthreewaysoftechnicalfeasibility,economicrationalityandreliabilityanalysis.Attheendofthat,Ichoosescrewdrilledgrout-cast-in-situpilefoundationasthebestprogrammeThenIwilldesignandcalculateit.Specificparametersandoptimizethebudgetestimatesummary:Choosethefifthlayerofsandtopile-bearingstratum.LengthfortheL=20m.PileDriveforφ600mm,usingC25pileofconcrete,pileZhujinfor8φ18,stirrupsforφ[e-mail]Planesizeof3×1.2m2,Bflatcapsizeof3×3m2.Spiralboredconcretepilespressureirrigationworksbasedonthetotalcostoftax:821378.38yuan.Comparesmayknow,theoptimalplanwillcompareotherplanbuildingcostofprojectsnearlytosave100,000Yuan.Fromthatweknowthedesignhavebasicallyachievedthethegoal.ofoptimizationdesign.Finally,Ihavefinishedtheworksoftechnicalprogrammesandtheproject’squalitytestingofthepilefoundation.Andinthepartofthemajorworkandconclusionofthedesign,themainoutcomedatawhichweredrewoutfromthedesign’sresultwereanalyzedandsummarized.Inaddition,themostimportantfeatureofthedesignisthatIhavebroughtoutseveralimportantissues,whichwereencounteredduringthestageofthedesign.,andanalyzedthem.Eventually,Iwillgivemyindividualsuggestionsonthat.Keywordsimmersedtubepilesscrewdrilledgrout-cast-in-situpilePrecastreinforcedconcretepilesoptimizedpromgramme-I-目录前言1工程概况........................................................................................................................11.1工程项目简介......................................................................................................11.2场地工程地质条件..............................................................................................12设计及相关技术国内外现状........................................................................................42.1设计要求及参数..................................................................................................42.2设计主要内容及设计思路..................................................................................42.3设计相关技术的国内外现状..............................................................................53工程方案论证及选择....................................................................................................63.1工程方案的初步拟定..........................................................................................63.2沉管灌注桩的设计..............................................................................................73.3螺旋钻孔压灌混凝土桩的设计........................................................................243.4钢筋混凝土预制桩的设计................................................................................393.5工程方案的确定................................................................................................544优化方案的设计计算..................................................................................................574.1选择桩径、桩长、桩材....................................................................................584.2确定单桩竖向承载力设计值............................................................................584.3确定桩的数量和平面布置................................................................................594.4群桩中单桩承载力验算....................................................................................604.5群桩承载力校核................................................................................................604.6群桩沉降计算....................................................................................................624.7螺旋钻孔压灌混凝土桩的截面校核................................................................644.8桩基承台设计....................................................................................................655施工技术方案设计......................................................................................................735.1施工方法设计及技术控制措