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1、Analysisandtreatmentofcracksincast-in-placereinforcedconcretemembers（现浇钢筋砼构件裂缝的分析与处理）WuhanKedaConstructionProjectSupervisionCo.,Ltd.MaPeimingAtpresent,alargenumberofhigh-risebuildingsinourcountryadoptreinforcedconcreteframeorreinforcedconcreteframeshearwallstructureThedefectsintheconstruc
2、tionandthedamageduringthelong-termusecausethewallorfloorknifetocrackandproducecracksofdifferentdegrees.Ifthecracksarenotdealtwithintime,theywillinevitablyaffecttheuseofbuildingsandevenstructuralsafety.Inordertoimprovethequalityoftheproject,thispapercomprehensivelyanalyzesthetypesofcracks,
3、thecausesandtreatmentmethods,andmeasurestopreventcracks.Hopethatthroughsummingupanalysis,canmakeoneselfinconstructiontechnology,qualitymanagementlevelhascertainimprovement.1.Themaincharacteristicsofcracksinreinforcedconcretemembers:Becausethetypeofreinforcedconcretemembersismore,thecauses
4、ofcracksofvariouscomponentsaredifferent,inordertomaketheconclusionreachacertaindepthInthispaper,thetwotypesofreinforcedconcretewallandfloorareanalyzed.1.1themaincharacteristicsofreinforcedconcretewallcracks:(1)themajorityofthemareverticalcracks,andmostofthemareclosetothewallheight,andthee
5、ndsofthemgraduallybecomethinanddisappear;(2)alargenumberofcracks,widthisgenerallysmall,morethan0.3mmofthefew,mostofthecracksarenotgreaterthan0.2mm;(3)crackstimeintheformworkshortlyaftersomeandthesuddendropintemperature;(4)astimecrackscontinuetodevelop,thenumberincreases,butthewidthofthese
6、amincreaseslittle;(5)thebasementwallhasfewercracksalongbothsidesofthelongwall,andthereismoreinthemiddleandnearby.Afterthebasementbackfill,commoncracksareleaking,buttheamountofwaterisgenerallynotlarge.1.2themaincharacteristicsofcracksinreinforcedconcretefloor:(1)cracksaregenerallyshort,not
7、morethan1meterslong,mostlyinthe300-600mm;(2)thenumberofcracksislargeandthewidthisabout0.5-3mm;(3)thefracturedepthisdifferent,andsomeofthethicknessthroughtheslabissomewhat3-100mm;(4)thedistributionofcracksisusuallyintheboxenclosedbythesecondarybeam,andsomeofthemaredi
