主講曾紹武陜西鐵路工程第講預(yù)應(yīng)力混課件講解

第20講預(yù)應(yīng)力混凝梁橋后張法施工主講：曾紹武

陜西鐵路工程職業(yè)技術(shù)學(xué)院2能夠掌握后張法的施工過程。目標(biāo)1能夠繪制后張法施工工藝流程圖。目標(biāo)2能夠模擬組織后張法施工。目標(biāo)3能力目標(biāo)target1objective2objective3Canmastertheconstructionprocessoftheposteriortensionmethod.Abilitytodrawthepostconstructionprocessflowchart.Cansimulatetheorganizationafterthetensionmethodofconstruction.任務(wù)導(dǎo)入：大中跨徑的預(yù)應(yīng)力混凝簡(jiǎn)支梁整孔預(yù)制，一般都采用后張法施工。中鐵十八局西潼高速改擴(kuò)建工程尤河大橋項(xiàng)目部，引橋15孔30米簡(jiǎn)支箱梁為工程實(shí)例，介紹后張法是要點(diǎn)。Taskintroduction:thewholeholeoftheprestressedcoagulationsimplesupportbeamwithlargeandmediumspanisprefabricated,whichisgenerallyconstructedbythepost-tensionmethod.InYouxiBridgeprojectdepartmentofXitongExpresswayreconstructionandexpansionprojectofChinaRailway18thBureau,the15holesand30metersoftheapproachbridgeistheprojectexample,andtheZhangmethodisthekeypointafterintroduction.預(yù)應(yīng)力混凝土后張法施工項(xiàng)目任務(wù)

1后張法施工工藝--主線3后張法施工過程所用設(shè)備后張法施工工藝實(shí)施方法123Post-tensionmethodconstructiontechnology--themainlineEquipmentusedinthepost-tensionconstructionprocessImplementationmethodofposttensionconstructiontechnology后張法箱梁制造工藝

一、制梁臺(tái)底模準(zhǔn)備Manufacturingprocessofbacktensionboxbeam1.Beammakingstagebottomformworkpreparation二.底腹板鋼筋綁扎

任務(wù)1鋼筋和預(yù)應(yīng)力筋報(bào)檢內(nèi)容？任務(wù)1解析：鋼筋規(guī)格、間距、尺寸、

數(shù)量、彎曲形式，位置。BindofbottomreinforcementTask1reinforcementandprestressedreinforcementinspectioncontent?Task1analysis:reinforcementspecification,spacing,size,quantity,bendingform,position.任務(wù)2：怎么保證預(yù)應(yīng)力位置？任務(wù)2解析：定位鋼筋，最少每50cm

要求和鋼筋籠焊接牢固Task2:Howtoensuretheprestressedposition?Task2analysis:positioningsteelbar,atleastevery50cmrequirementsandsteelcageweldingfirmly123任務(wù)3：通過圖片分析抽拔式和埋置式制孔器區(qū)別？任務(wù)3解析：形狀、工作原理、材質(zhì)Task3:Analyzethedifferencebetweendrawingtypeandburiedholemakerthroughpictures?Task3analysis:shape,workingprinciple,material三、內(nèi)模安裝

打磨清理內(nèi)模、安裝3.InternalmodeinstallationGrindingandcleaningtheinternalmoldandinstallation四、模板安裝：端模板安裝

4.Templateinstallation:terminaltemplateinstallation模板安裝：側(cè)模板安裝，模板安裝調(diào)整，檢查軸線、標(biāo)高，接縫、預(yù)埋件、連接件Templateinstallation:sideformworkinstallation,formworkinstallationandadjustment,checktheaxis,elevation,joints,embeddedpartsandconnections五、頂板鋼筋安裝

5.Installationofroofsteelreinforcement六、澆筑混凝土

混凝土運(yùn)輸、振搗

注意采用抽拔式制孔器時(shí)間。Six,pouringconcreteconcretetransportation,vibrationpayattentiontotheuseofdrawingtypeholemakertime.蒸汽養(yǎng)護(hù)篷布遮蓋溫度計(jì)鍋樓蒸汽鍋爐七、養(yǎng)護(hù)：薄膜灑水、噴霧、蒸汽養(yǎng)護(hù)Seven,maintenance:filmsprinklingwater,spray,steamcuringsteam-curedthermometerThepotfloorsteamboilerClosurecover八、拆模Eight,moldremoval卷揚(yáng)機(jī)穿鋼束穿束機(jī)械穿鋼束九、穿預(yù)應(yīng)力筋：任務(wù)1穿束前清孔、穿束方法和設(shè)備？任務(wù)1解析：空壓機(jī)，卷揚(yáng)機(jī)，穿束機(jī)

9.Wearprestressedtendons:Task1:Clearholes,piercingmethodandequipmentbeforepiercing?Task1analysis:aircompressor,winist,throughmachineThehoistpassesthroughthesteelbeamMechanicalmechanicalthroughsteelharness穿束二期張拉錨環(huán)鋼絞線十、張拉：任務(wù)1設(shè)備選用、雙控含義、安全？任務(wù)1解析：設(shè)備：穿心式千斤頂，設(shè)備標(biāo)定雙控：應(yīng)力控制、伸長量控制安全：張拉速度，不能超過張拉控制應(yīng)力人不能在設(shè)備后，夾片安裝牢靠Task1Analysis:Equipment:piercingjack,equipmentcalibrationdoublecontrol:stresscontrol,elongationcontrolSafety:thetensionspeed,cannotexceedthetensioncontrolstresspersoncannotbeinstalledaftertheequipment,theclipisfirmlyTask1Equipmentselection,doublecontrolmeaning,safety?十一、清孔、壓漿：壓漿泵壓漿壓漿頭任務(wù)1注意所用的設(shè)備，要求？任務(wù)1解析：壓漿泵、壓接管頭漿體膨脹，飽滿流出Task1analysis:pressureslurrypump,pressurecontrolheadslurryexpansion,fulloutflowTask1Notetheequipmentused,requirements?Xi.Holecleaningandgrouting:封錨前封端十二、封端：stopend后張法施工工藝實(shí)施方案后張法施工工藝后張法施工過程所用設(shè)備

13123小結(jié)：Post-tensionmethodofconstructiontechnologyEquipmentusedinthepost-tensionconstructionprocessPost-tensionconstructiontechnologyimplementationplan(1)橋墩施工情境：10*25m簡(jiǎn)支梁橋，雙柱橋墩，柱高12-30m，矩形柱為1.4*1.8m，橋下無水。要求編制后張法施工方案，制定相應(yīng)的實(shí)施方案。(2)教材P199，5.21，5.23

作業(yè)卡片關(guān)鍵：根據(jù)橋梁施工情境和施工單位的人員、材料、設(shè)備條件來選擇經(jīng)濟(jì)合理的施工方法。(1)Pierconstructionsituation:10*25msimplysupportedbeambridge,doublecolumnpier,columnheight12-30m,rectangularcolumnis1.[]4*1.[]8m,nowaterunderthebridge.Itisrequiredtopreparethepost-methodconstructionplanandformulatethecorrespondingimplement