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地形平坦开阔,地层由第四系全新冲积层,第四系上更新统冲层组成,局部表覆第四系全新统人工堆积层。第四系全新统冲积层厚度约25~50m,岩性主要为黏土、粉质黏土、粉土、粉砂、细砂;第四系上更新统冲积层厚度大于50m,岩性主要为黏性土、粉土、粉细砂等。管桩深度范围内地层主要为:粉土、黏土、粉质黏土,局部表层为杂填土。couplingCentreshallbechecked,thesecondpouredconcretestrengthofmorethan70%.Intheprocessofreamingorboring,apartfromthespecialprovisionsinfactory,doesnotallowanyworkthatmayaffectthecouplingCentre,suchasirrigation,tocylinderconnectionstofloodthecondenserpipesandsoon.Wellboring,hingeboltholeflangewithcouplingofvertical,notoblique.Mountingboltsshouldbeaddedlubricants,typinggentlywithasmallhammer,nottoolooseortootight,packedtheboltswiththecorrespondingsealscrewholeshouldbemarked.6.4.5.4.2couplingreamedandpairingsisclosetothediameterofboltbearinggoodhingeholes,dressedwithagoodtwocouplingboltsbeforeyoucanmovetherotor,boring-reamingholeinturn.Couplingboltsmustbetightcouplingissymmetricaldiameter,inboring,reaming,twoboltsout.Wellboring,hingeboltholeflangewithcouplingofvertical,notoblique.Duetothecouplingboltsinaccordancewithhingeholescorrespondingtothediameterofthescrewholesonebyoneafterprocessing,processingbackboltinstallationlocationcannotbechanged,soaccordingtoboltaftertheactualweightdifferenceofnutandlockwashertomatch.Generalrequirementsforcouplingtwosymmetricaldiameterbolt,nutandlockwasher'stotalweightdifferenceshouldnotbegreaterthan10gandknocksstampedmark.(SeeFigure18)Thecouplingboltsapplylubricant,andthengentlywithcopperhome,nottoolooseortootight.BoltAssemblyisfinished,symmetricaltighteningallboltsto30%,50%,70%,100%force,andcheckthecouplingflutterandbeforeconnectingthecirclegraduallychangesitsvalueshouldbelessthan0.02mm.Tighteningtorqueofthecouplingboltsshallcomplywiththetechnicalrequirementsmanufacturersdrawings,withadynamometricwrenchorlogtensiontools.Threewheelrotorswingtestcouplingconnectionsshouldbechecked:takingleave,预制箱梁首件工程施工方案1、工程概况1.1、首件工程目的通过首件工程认可制工作的开展,使我们能够熟练掌握新工艺、新材料、新设备以及其它关键性技术的要求,并在实施过程中发现、分析和解决出现的各类问题,不断提高技术水平和工艺水平。1.2、首件工程的编制依据《公路工程质量评定标准》JTCF80/1-2004《公路桥涵施工技术规范》JTG/TF50-2011黄延高速公路扩能工程施工设计图纸1.3、适用范围TJ-4标段首片40米箱梁施工。1.4、工程简介黃延高速扩能工程试验段LJ-4合同段共需预制小箱梁总计295片,其中40m箱梁265片,20m箱梁30片。预制厂内设100T大型龙门吊一套,净跨24m,净高8m,负责提梁运梁,辅助吊运模板;内设小型龙门吊1套,净高5m,专门负责吊装模板和混凝土施工,两种龙门吊共用一条轨道。箱梁台座基础直接座在灰土顶层上,在台座两端采用长3m,宽2m,厚50cm的混凝土扩大基础,并铺设两层Ф12@200mm*200mm的钢筋网片,防止小箱梁张拉后,台座两端应力集中压坏台座,台座扩大基础采用C20混凝土浇注;台座采用混凝土结构,厚30cm,宽度同小箱梁底宽,台座基础达到一定强度后,用经纬仪放出台座两侧边线,地形平坦开阔,地层由第四系全新冲积层,第四系上更新统冲层组成,局部表覆第四系全新统人工堆积层。第四系全新统冲积层厚度约25~50m,岩性主要为黏土、粉质黏土、粉土、粉砂、细砂;第四系上更新统冲积层厚度大于50m,岩性主要为黏性土、粉土、粉细砂等。管桩深度范围内地层主要为:粉土、黏土、粉质黏土,局部表层为杂填土。couplingCentreshallbechecked,thesecondpouredconcretestrengthofmorethan70%.Intheprocessofreamingorboring,apartfromthespecialprovisionsinfactory,doesnotallowanyworkthatmayaffectthecouplingCentre,suchasirrigation,tocylinderconnectionstofloodthecondenserpipesandsoon.Wellboring,hingeboltholeflangewithcouplingofvertical,notoblique.Mountingboltsshouldbeaddedlubricants,typinggentlywithasmallhammer,nottoolooseortootight,packedtheboltswiththecorrespondingsealscrewholeshouldbemarked.6.4.5.4.2couplingreamedandpairingsisclosetothediameterofboltbearinggoodhingeholes,dressedwithagoodtwocouplingboltsbeforeyoucanmovetherotor,boring-reamingholeinturn.Couplingboltsmustbetightcouplingissymmetricaldiameter,inboring,reaming,twoboltsout.Wellboring,hingeboltholeflangewithcouplingofvertical,notoblique.Duetothecouplingboltsinaccordancewithhingeholescorrespondingtothediameterofthescrewholesonebyoneafterprocessing,processingbackboltinstallationlocationcannotbechanged,soaccordingtoboltaftertheactualweightdifferenceofnutandlockwashertomatch.Generalrequirementsforcouplingtwosymmetricaldiameterbolt,nutandlockwasher'stotalweightdifferenceshouldnotbegreaterthan10gandknocksstampedmark.(SeeFigure18)Thecouplingboltsapplylubricant,andthengentlywithcopperhome,nottoolooseortootight.BoltAssemblyisfinished,symmetricaltighteningallboltsto30%,50%,70%,100%force,andcheckthecouplingflutterandbeforeconnectingthecirclegraduallychangesitsvalueshouldbelessthan0.02mm.Tighteningtorqueofthecouplingboltsshallcomplywiththetechnicalrequirementsmanufacturersdrawings,withadynamometricwrenchorlogtensiontools.Threewheelrotorswingtestcouplingconnectionsshouldbechecked:takingleave,并在两端3米范围内适当增加Ф12@200*200的钢筋网片,防止台座扩大基础对上部台座的剪切破坏,然后施工10cm的混凝土垫层,将预先制作好的50槽钢框架同台座预埋钢筋焊接整体后安装固定,支立模板,在距台座顶面10cm每隔一定距离设置一根φ7cm两端封口的PVC管,方便以后横穿拉杆加固模板使用,台座采用C30混凝土浇注,浇注完成混凝土达到一定强度后,在台座顶面角钢框架上焊一层厚6mm钢板作为底模,在钢板与钢板之间预留2mm伸缩缝,并用原子灰填平,防止由于台座混凝土与钢板之间伸缩不同步,造成钢板起拱破坏,底模钢板必须用刨光机打磨、除锈、刨光,保证混凝土外观质量。根据箱梁数量,设置40m小箱梁台座16个,模板加工5.5套;其中40m箱梁4套,其中中梁2套,内外边梁各1套;20m箱梁1.5套,台座数量为40m小箱梁16个。台座总数量为16个,分4排,每排4个,台座间距4.4m,预制厂中间预留7.9m宽混凝土罐车运输通道;每排台座之间按3m设置,梁场两端各预留3.5m宽龙门吊活动空间。为了提高台座使用效率,将40m及20m台座设置成40m通用台。2、主要施工方法施工艺流程清理台座→刷脱模剂→绑扎底板钢筋→绑扎腹板钢筋→波纹管定位→立侧模→立内模→绑扎顶板钢筋→浇筑混凝土→养生→拆除内、外模→张拉→压浆→封端→移梁。2.1、钢筋、钢绞线加工及箱梁钢筋绑扎钢筋、钢绞线要有出厂质量证明书和试验报告单,并按规范要求的频率进行抽验,按不同规格挂牌堆放,下垫上盖,为避免锈浊和污地形平坦开阔,地层由第四系全新冲积层,第四系上更新统冲层组成,局部表覆第四系全新统人工堆积层。第四系全新统冲积层厚度约25~50m,岩性主要为黏土、粉质黏土、粉土、粉砂、细砂;第四系上更新统冲积层厚度大于50m,岩性主要为黏性土、粉土、粉细砂等。管桩深度范围内地层主要为:粉土、黏土、粉质黏土,局部表层为杂填土。couplingCentreshallbechecked,thesecondpouredconcretestrengthofmorethan70%.Inth
本文标题:预制箱梁首件施工方案
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