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1、预应力混凝土小箱梁预制施工技术探讨余良碧摘要永安村公路桥为南水北调中线京石段渠道项目S6标段最大的一座跨渠道交通桥，桥梁汽车荷载为公路-Ⅰ级，桥梁上部结构为3×25m装配式预应力混凝土小箱梁，梁体预制采用后张法施工。关键词南水北调中线；交通桥；预应力混凝土小箱梁；桥梁预制1前言永安村桥是南水北调京石段渠道项目S6标段中与渠道交叉的最大一座交通桥，桥梁汽车荷载为公路—Ⅰ级。桥梁上部结构为3×25m装配式预应力混凝土小箱梁，采用先简支后连续体系。桥面宽26m，每跨8片箱梁，共计24片梁。梁高1.4m，梁顶面宽2.4m，底板宽1.0m，中段腹板厚18c
2、m，梁端腹板厚25cm，横隔板间距8m，板厚18cm。详见图1、图2。图1永安桥纵断面图2桥梁施工工艺流程2.1施工工艺流程预应力混凝土小箱梁施工工艺流程见3。2.2施工工艺说明2.2.1预制梁场布置及底模施工依据施工总体规划，在施工辅道和省道之间布置永安桥预制梁场。为避免冬季施工过长而影响预制施工进度，现场一次性建造24个台座。考虑梁体吊运过程中拖车及吊车通行，台座采用每两个分组布审稿：冯文彬图2永安桥横断面图massestour;Increasetheintensityoftheinvestigationandmediationofdispu
3、tes,fullimplementationofthebacklogforprocessingoflettersandcallssystemofleadingcadres;Keepagainstallformsofillegalandcriminalactivitiesofhighhanded,ensureagoodsocialorder;Strengthenthecollectionofintelligenceanalysis,closelyguardedactivitiesofevilcults;Fullimplementationofthe
4、socialsecuritypreventionandcontrolinkeyareasandthetreatmentofseriouspublicsecurityissuestotroubleshoot,ensuringharmonyandstability.Fourfurtherstrengthenpublicityandideologicalwork.Typicalhighlightsofselectedtreecultivation,andmoralexemplarsintheprovincedonothaveemerged,respec
5、tingthemoralmodelHangLiPoh,theprovincialworkerYuYoubo,State-levelmodelworkerFanYouzhi,HuJingqiu,includingYunnan,nujiang'sfinest,promotedthetheme,thecombinationofapositiveenergy.HunansatelliteTVinwangjiduVillagecompletedthemetamorphosisoftheshow'sfilming,silentnunutelevisionpr
6、ogramairedthe"busybody"LaoLi,ancientvillage,woodandJiacunandXXmvillageswereratedasprovincialandStatelevelcivilizedvillage.XXinternationalvisibilityandreputationfurtherenhanced.Inaddition,wecontinuetopromotedemocracy,people'scongresses,politicalconsultativeconferenceroleplay,g
7、ongqingfu,amassorganizationtobetterservethescientificdevelopment.Further置，组与组之间预留8m宽的过车通道。预制场地平整压实后，制作混凝土台座，每个台座结构尺寸为28m×1.0m×0.4m，台座四周采用砖砌体，厚度10cm，以便固定拉杆孔预埋管（拉杆孔采用φPVC管，间距80cm），中间填充C20砼，表面磨光整平，铺地板革脱模层。强度合格预制梁台座施工安装底板和腹板钢筋波纹管安装定位安装侧模、内模波纹管内安装套管、仓号验收安装端模、锚垫板、绑扎顶板钢筋拆模混凝土养护预应力孔道
8、清理、穿钢绞线孔道压浆、养护钢绞线编束立模浇筑封端混凝土移梁存放拌制浆体设备标定、锚具检查安装支座预埋钢板预制梁场准备张拉钢绞线同期养护
