Shallow housing construction problems（淺討房屋建筑施工問題）

1/1Shallowhousingconstructionproblems（淺討房屋建筑施工問題）Shallowhousingconstructionproblems（淺討房屋建筑施工問題）ShallowhousingconstructionproblemsHousingconstructionisanimportantmaterialbaseandindispensablefacilitiesforhumanexistence,lifeandwork.Therefore,weshouldpayattentiontothequalityproblemsintheprocessofbuildingconstruction.Atpresent,therearemanyproblemsinhousingconstruction,suchaswallcracking,unevensettlementofbuildings,imperfectsafetymanagement,pollutionoftheenvironment,noisenuisance,andimperfectcostmanagement.Theseproblemsdirectlyaffectthelivesandpropertysafetyofthepeople.1,concreteprotectivelayeranditsuseloadproblemMostoftheconstructionunitsintheprecastblockarenotplacedbelowreinforcedprotectivelayer(afewconstructionunitwiththegravelpad,isnotinconformitywiththeprovisions,becauseofthesmallstoneZiyiwalk,andaprotectivelayerthickness).Whenpouringconcrete,inordertoguaranteetheconcreteprotectionlayer,thesteelskeletonorthesteelnetpieceofthefloorisliftedupwards.Thisiswrong,wecannotachievetherequirementsoftheconcreteprotectionlayer,andthesteelframeorsteelmeshpositioning,moreseriousisthebendingdeformation,cannotguaranteethequality.Intheconstructionprocess,inordertorushperiod,intheconcretefloorbeamonthefloorafewdayslater,theypiledupbrickorotherheavyload,look,notwhatfloorconcretedamage,butearlyconcreteunderheavyload,willleadtoosteoporosis,resultinginthecrackingofconcrete,concreteslabcannotreachthedesignstrength.Inaccordancewiththeprovisionsofconcretepouringandmaintenancefor28days(atleast21days)towithstandpermanentload,orheaviertemporaryload.2,thecolumnstructureandconcreteplacementintheframestructureThestructurefeatureofthecolumndieisthatthesectionsizeisnotbigandtheheightislarger.Therefore,theconstructionofthecolumntemplateismainlyconcernedwithensuringtheverticalityandresistancetothesidepressureofthenewconcrete.Itisalsoeasytopourconcrete,cleanthegarbageandreinforcethesteelbars.However,inactualconstructionoperations,generallylazy.Non-standardwayis:alongthecolumnheight,every3Mdonotopentheirrigationhole,andthestringofbarrelsorpipeandbecausethesteelistoodense,cannotuse.Therefore,theconcretepouringChaimoaccordingtotheprovisions,allkindsofconcretedefects,suchasdelaminationfromdemolition,honeycomb,largeareareinforcementandseriousholephenomenon.Inaddition,whenthefloorheightishigherortheprojectquantityisbig,thecolumnandthebeamplatearedividedintotwotimestopourinthepracticeconstructionprocess,thereistheseriouswrongpractice:2.1whenpouringcementmortartotopappearthick,withnocleanaggregateandcarefullycompacted,thetoplayerofinsufficientstrengthinmortar,beamcolumnjoints,cracks.2.2columnconstructionjoints(includingbeams,platesandotherconstructionjoints)shouldpayattentiontothetreatment.Accordingtotheprovisionsintheconstructionjointscontinuepouringconcrete,theconcretestrengthupto1.2N/msquaremeters,clearconstructionjointsurfacecementfilmloosestonesandweakconcretelayer,thewetting,rinse,andthenalayerofcementmortar,concretepouring,meticuloustamping,theclosecombinationofnewandoldconcrete.3,onthepilefoundationconstructioncommonproblemsandmeasurestaken3.1longspiralboredconcretefillingpileLongspiralconcretefillingpileiswidelyusedintheconditionofnowaterorsand.Theutilitymodelhastheadvantagesoffastconstructionspeed,qualityguarantee,buttheconstructioneasilyappearedinthefollowingproblems:drillingmachinetodrillholebottomelevationshouldstopdrillingstaticliftdial,suchasdrilldrillpipe,resultinginalargenumberofsoilinthebottomofthehole,reducingthepileendbearingcapacity,inpouringconcreteshouldbepouredintothe30-20cmstonewithahammer,thenundercompaction,pouringconcretereinforcingcage.Thecollapseofconcreteperfusioncontrolin10cmistoosmall,easilybrokenpilecollapse,concretepouringshouldbefullofvibration.3.2vibratoryboredpile(ZhenBazhuang)Thevibrationofboredpileingroundwater,muckysoilandthicknessofnotmorethanthreemetersofsandintheconstruction,theconstructioncostislowrelativetootherunderwatercast-in-placepile,Buttheconstructionpilepenetratesthethicknessofmorethanthreemetersoffinesand,mediumsand.Besubjecttocertainrestrictions.Pileconstructioncannotcontroltheelevationalone.Doublecontrolmustprevail.Itisnormaltohavedifferentlengthofpilesinthesameneighborhood.Itisstrictlyforbiddentovibrateforlongtimewhenthepiledoesnotreachthedesignelevation,otherwise,theadjacentpilewillbereducedorbroken.Inconstruction,inordertoimprovethebearingcapacityofthepile,itshouldbecalledagain.Whenitisrehit,thesoilonthevibrationtubemustbecleanedandthenconstructed.Inthesoil,noanti-plug,becausethesoilinthebackoftheplug,itiseasytobringmudtothepile,resultinginbrokenpiles.3.3pressuregroutingpilePressuregroutingpileisnonsandconcretepile,thepilebycementslurryonthepileofsoilpenetration,improvethebearingcapacityofthepile,sandcarryingcapacityis1.1~2timesoftheordinarypile,whichissuitableformostofthegeologicalconditionsofthistypeofpileconstruction,pilebearingcapacityisrelativelyhigh.Thebottomofthepilewithoutsoil,sothebearingcapacityofpileendishigher.3.4superflowconcretepouringpileSuperfluidconcretepiletoadapttovariousgeologicalconstruction,withitshighstrength,highbearingcapacity,fastconstructionspeed,costisrelativelylowinrecentyears,extensiveapplication,thetechnologyofpileconcreteprincipleispressedintotheholethroughthedrillpipewithconcretepumpsuperfluid,formingtheconcreteretainingwall.Theconcretefilledholeunderthesteelcagetothedesignelevationofthepileintheconstructionprocess,thesoilaroundthepileisdense,andthesuperfluidconcretepiletosoilpenetration,improvedthepropertiesofpilesurroundingsoil,brokenpile,necking,putanendtothebottomoftheholesoil,improvethebearingcapacityofthepile.Thebearingcapacityofpileis1.05~2timestheordinaryindeed.Whenthepileisinjectedintotheconcrete,itis1.2to2.2timesthebearingcapacityoftheordinarypileafteritisinjectedwithgrout.4,theconstructionofthesurfacereinforcementlayeristoolargeIntheconstructionoffloorslab,afterthereinforcementisfinished,theconstructionstaffusuallyusethehorsestooltosupportthesteelbaranderectthesteelbaronthefloorsurfacetopreventitfromfallingdown,soastoensurethattheprotectivelayeroftheglutenisnottoobig.Butthisseeminglyreliableapproachinconcretepouringprocessstillcannotreallyplayitsproperrole.4.1mainreasons4.1.1horsestoolstandsteelbarnumberistoolittle.Fortheconstructionofcostsavings,oftenonlyholdingasmallamountofhorsestoolmuscle,becausethedistanceistoolarge,thefloorsurfacelayerisfirmlysupportedonlyreinforcedlocally,butthereisstillalargepartofthesurfacelayerreinforcedtheroleofexternalforceinconstructionandfall,resultingintheprotectivelayeristoolarge.Theinfluenceof4.1.2concretedistributionmethod.Whentheconcretefloorismadeofconcrete,theverticaldropoftheconcretewillformabigimpactforcewhenthebucketisopenedandunloaded,andthereinforcingbarofthestoolistoobig,andthesteelonthesurfaceiseasilydeformed.Similarly,theproblemariseswhenanautomobileconcretepumpisusedtopumpconcretetothefloor.4.1.3constructionpersonneltrampling.Theconcreteopenvibratedafterconcretesurfaceforpreliminaryleveling,atthistime,becausetheslabreinforcementhasbeencovered,theconstructionpersonnelcannotseethehorsestoolsupportingreinforcedparts,onlytrampleonthesurfaceofconcreteoperation,easytoscratchonthesurfaceofsteeltofall,andnoteasytobeaccuratelyreset.4.2inviewofthespecialroleofthehorsestoolreinforcement,thespecifications,types,layoutmethodsandquantitiesofthehorsestoolsupportsteelshallbeclearlydefinedinthedesigndrawings,andtheitemshallbeincludedinthedesignquantity.Thismethodhastwoadvantages:first,thecontractorcannolongerreducethenumberofhorsestoolsforsavingmaterials,andthequalityofconstructionisguaranteed.Two,thesupervisioncanhaveabetterbasisforeffectivesupervisionandmanagement.Inaddition,asthesizeandsizeofthehorsestoolaresmall,andthesurpluswastematerialcanbeprocessedbythereinforcingsteelbar,thecostincreasecausedbythemoderateamountincreaseisslight.4.2.2lookingforwaystoreducecostsandstandardizeconstruction.Theideaofthedevelopmentofalternativematerialsofothereconomy,suchasplasticsupportthecardcanbeblocked,formedaseriesofproductsofdifferentsizesaccordingtodifferentslabthickness,whensettingandscaleproduction,Thecostshouldbelowerthanthehorsestoolmadeofsteelbars.FurtherimprovementistochangeitRecyclabletypetwowithToca,compactionsurfacefloatwiththedemolitioninthefloor,repeateduse.Thiscanfurtherreducethecost,atthesametime,italsocanbeusedasanewbranchofTocaconcretesurfacefortheelevationrodinpeacetime,inordertocontrolthethicknessofslabcasting.5,roofingwaterproofproblemTostrictlycontrolthefinestoneconcretetechnology,watercementratioisgreaterthan0.55,Portlandcementgradeisnotlessthan425#permeterofcementconcretenotlessthan330kg,themaximumsizeofcoarseaggregateshouldnotexceed15mm,mudcontentislessthan1%,sandrateis35~40%,thesandorcoarsesand,atthesametimeappropriate,addingwaterreducingagentorwaterproofagent,bulkingagent,additive.Thethicknessofthewaterprooflayerisnotlessthan40mm,andthetwo-wayreinforcedwiremeshshallbeinstalled.Thefinestoneconcreteshallbecovere