钢网架结构拼装工艺标准(-)（standard for assembly of steel grid structures (-)）

'钢网架结构拼装工艺标准(506-1996)（Standardforassemblyofsteelgridstructures(506-1996)）RangeTheprocessstandardisapplicabletothegroundassemblyofsteelgrid,boltedsphericaljoints,weldedballjointsandweldedsteelplatejoints.Constructionpreparation2.1materials:2.1.1steelgridassembledsteelandconnectingmaterials,high-strengthbolts,weldingrodandothermaterialsshouldcomplywiththedesignrequirements,andshouldbefactorycertification.2.1.2boltball,hollowweldingball,auxiliaryweldingball,taperhead,sleeve,sealplate,netframemember,weldedsteelplatenodeandothersemi-finishedproductsshallcomplywiththedesignrequirementsandthecorrespondingnationalstandards.2.1.2.1steelproductsusedinthemanufactureofsteelstructurespacetrussesmustcomplywiththedesignspecificationsandtechnicalspecificationsandstandardsforthecorrespondingmaterials.Boltballisprohibitedfromoverheating,cracksandhiddendangers.Thefinishedballmustbetestedfortensilestrengthofthelargestscrewhole.Thequalityrequirementsandinspectionmethodsoftheboltball shallconformtotheprovisionsoftable5-14.Allowabledeviationofboltballandtestmethodtable5-14Theallowabledeviationofsubproject(mm)inspectionmethodD=120,+2.0-1.0D>120+3.0-1.5D=1201.5D>1202.53boltballscrewendandthespherecenterdistance+0.20withverniercaliper,heightgaugeinspection,measuringmandrelOnthesameaxistwoscrewD1200.20HoleendfaceparallelismD>1200.30Theanglebetweenthe5adjacenttwoscrewholesisequalto30".Themandrel,therulerandtheindexheadarecheckedbythemeasuringmandrel0.5%r6screwendverticalitywiththeaxisoftheindicatorNote:Ristheendradiusofthescrewhole.2.1.2.2assemblyofhigh-strengthboltsofsteelmustcomplywithdesignrequirementsandthecorrespondingtechnical standards.Highstrengthboltsforsteelgridstructuresmustadoptthenationalstandard"steelstructurewithhighstrength,sixanglebolts",theperformancegrades8.8Sor10.9S,andshouldbecheckedaccordingtothecorrespondinggraderequirements.Checkthefactorycertificateofhighstrengthbolts,checkthetestreport,andcheckthereinspectionreport.Thesurfacehardnesstestofeachhighstrengthboltshallbecarriedoutbeforeassembly,andcracksanddamageshallbestrictlyprohibited.Theallowabledeviationandtestmethodofhighstrengthboltsshallconformtotheprovisionsoftable5-15.Allowabledeviationofhighstrengthboltandtestmethodtable5-15Theallowabledeviationofsubproject(mm)inspectionmethodThe1threadlength(t+2t0ZiXi?2boltlength+2t-0.8t3+0.2groovedepthwithrulerandverniercaliperinspection4keywaystraightness<0.25position<0.5Thematerials,specificationsandqualityoftheweldingballmaterialsusedfor2.1.2.3assemblymustcomplywiththedesignrequirementsandtherelevantstandards.Weldingelectrodes,weldingflux,weldingwireandprotectivegasshallcomplywith thecorrespondingtechnicalrequirementsandregulations.Theweldingballshallhavethefactorycertificateandthesteelballbearingtestreport.Theweldedballforassemblyshallcomplywiththeprovisionsoftable5-16.Allowabledeviationofweldingballandtestmethodtable5-16Theallowabledeviationofsubproject(mm)inspectionmethodThe1ballweldheightisequaltotheoutersurfaceoftheballby0.5+.Usetheweldgaugetocheck8pointsalongthecircumferenceoftheweld2balldiameterD=1.5+1.5withcaliperandverniercaliperinspection,eachballmeasuringanisotropythree3balldiameterD>300+2.5value4ballroundnessD=300=1.5withcaliperandverniercaliperinspection,eachballmeasuringthreepairs,eachpairofeachotherTheroundnessofD>300=5,theball2.5into90degrees,withthreeoftheaveragediameterdifferencemeter6ofthetwohemispheresofthealigndeviationvalueislessthanorequalto1withmoldandverniercaliperinspection,eachmaximumstaggeredgepoint2.1.2.4steelgridassembly,sealingplate,coneheadandsleevesteelmustcomplywiththedesignrequirementsandthe correspondingtechnicalstandards.Sealingplate,conesleeve,theappearanceofcrack,woodburningandoxideskin.Thequalityrequirementsandinspectionmethodsforthesealingplate,taperheadandsleeveshallconformtotheprovisionsoftable5-17.Permissibledeviationsandtestmethodsforsealingplates,taperheads,sleeves,Tables5,7Theallowabledeviationofsubproject(mm)inspectionmethod1plate,coneheadbore+0.5Thethicknessofthe2plateandconeheadis+0.5-0.23sealingplate,conebottomplatetwoisparalleltothesurfaceofdegree0.1withdialindicator,Vblockcheck4sealingplate,aconicalheadholeandpipeinstallationstepswith0.2coaxialdialindicator,Vblockcheck5coneheadwallthickness+0.20checkwithverniercaliper6sleeveholesand0.5coaxialcircumcirclewithverniercaliper,dialindicator,checkthemeasuringmandrel7sleevelength+0.2,checkwithverniercaliper8theverticalityofthetwoendsofthesleeveandtheaxis0.5%r 9theparallelismofthetwoendsofthesleeve0.3Note:1.plates,taperheadsandsleevesshallbeinspectedandevaluatedseparately.2.Ristheradiusofcircumcirclesleeve.2.1.2.5steelwiremeshweldedsteelplatemustcomplywiththedesignrequirementsandthecorrespondingtechnicalstandards.Theweldingmaterialsshallhavethefactorycertificateandthecorrespondingtechnicalstandards.Theweldedjointsofsteelplatejointsshallmeetthedesignrequirements.Thequalityrequirementsandinspectionmethodsshallcomplywiththeprovisionsoftable5-18.Allowabledeviationsofsteelplatejointsandmethodsofinspectiontable5-18Theallowabledeviationofsubproject(mm)inspectionmethod1gussetplatelengthandwidth+2.0mm,checkedbysteelplateruler2nodeboardthickness+0.5mm,checkwithverniercaliper3crossgussetangle+20"4thecrossanglebetweenthegussetplateandthecoverplateis20+Thesteelproducts,specificationsandqualityofthe2.1.2.6 steeltrussassemblymustcomplywiththedesignrequirementsandthecorrespondingtechnicalstandards.Theconnectionbetweenthesteelpipememberandthesealingplateandtaperheadmustcomplywiththedesignrequirements,andtheweldingqualitystandardmustmeetthetwogradequalitystandardinthecurrentnationalstandard"codeforconstructionandacceptanceofsteelstructures".Thestrengthtestoftheweldedjointbetweenthesteelpipememberandthesealingplateorconeheadshallbecarriedout,andthebearingcapacityshallmeetthedesignrequirements.Thequalityrequirementsandinspectionmethodsofsteelpiperodsshallconformtotheprovisionsoftable5-19.Bartolerancesandmethodsoftesttable5-19Theallowabledeviationofsubproject(mm)inspectionmethod1steelbarprocessinglength+2withrulercheck2weldedballgridsteelpiperodlength13boltballgridsteelpiperodfinishedlength14baraxisunevennessandmorethan5L/10005plateorconeheadandverticalaxisofsteelpipe0.5%rNote:L,rodlength,R,plateorconeheadradius.2.2mainmachinesandtools Electricweldingmachine,oxygenacetyleneequipment,wheelsaws,pipecuttingmachine,steeltape,steelruler,verniercaliper,thicknessgauge,ultrasonicflawdetector,magneticdetector,hammer,steelwirebrush,calipers,dialindicatortestinginstrument.2.3operatingconditions:2.3.1assemblyweldermusthavethecertificateofweldingtest,andhavethequalificationofweldingmaterialandweldingstation.2.3.2assemblyshouldbedonebeforetheassemblysitesafetyfacilities,fireprotectionfacilities.Todetectfetalassemblypriortoassembly,topreventfetalmovementanddeformation.Theassemblyshallsetasideappropriateallowancepositionofweldingdeformation,preventassemblydeformation,deformationangle.Thedimension,grooveangleandweldgapofthe2.3.3assemblyshallbeinaccordancewiththeregulations.2.3.4familiarwithdrawings,compiletheassemblyprocess,anddoagoodjoboftechnicaldisclosure.Beforethe2.3.5assembly,thehigh-strengthboltsusedforassemblyshallbetestedbyhardnesstestonebyonetoachievethestandardvalue.Operationprocess 3.1process:Jobpreparation,ballprocessingandinspection,barprocessingandinspection,smallspellingunit,unitofassembly,welding,assembly,unitacceptance3.2jobpreparation:3.2.1boltballmachine,fixtureadjustment,angledetermination,machineryandequipmentpreparation.3.2.2weldingballprocessing;heatingfurnaceforweldingballpressadjustmenttool,fixturepreparation.Manufactureandinstallationof3.2.3weldingballhalfroundfaceframe.3.2.4weldingequipmentselectionandweldingparametersetting,automaticwelding,automaticweldingequipmentinstallationanddebugging,oxygenacetyleneequipmentinstallation.3.2.5assemblywithhighstrengthbolts,shouldbeprotectedbeforeassembly,onebyone,topreventsmallfightwhenflying,cheap,affectingthethread.3.2.6electrodeorfluxforbakingandheatpreservation,thermalinsulationmaterialshouldbedevotedtobakingoven.3.3ballprocessingandinspection: 3.3.1ballmaterialsizecontrol.Appropriateallowancesshallbereleased.3.3.2markingandprocessingoftheboltball,milling,plane,angle,drilling,tapping,inspectionandsoon.3.3.3thepropertemperatureoftheweldingballmaterialheatedto600~900degreescentigradeshouldbeuniformlyheated.Theheatingfurnaceisbettertobeheatedbythegasfurnace.3.3.4afterheatingsteelinhalffetalframe,graduallypressedintoahalfroundball,shouldtrytoreducepressureandpressurethinthicknessduringpressing,takemeasuresofuniformheating,pressingironoxideshouldbeclearedup,halfballinpositionpositioncantransform.3.3.5halfballoutoftireaftercooling,Adjusttheradianofthehalfballwiththesample,thencuttheplaneofthehalfball,payattentiontotheradius,butleavethemarginofthecircle.3.3.6thehalfballshallbecorrectedaftercuttingandthegrooveangleandformshallbeinlinewiththedesignrequirements.Halfround3.3.7stiffenedandweldedhollowsphericaljointforceisdifferent,sotheimportantnodeofsteeltrussaregenerallyarrangedribbedweldedball,thereareavarietyofribbedforms,withthehelpofsingleanddoubleverticalribs,sotheball,sotheballbeforeassembling,shouldalsobe stiffenedandwelding.Notethattheribheightshouldnotexceedtheradiusofthecirclesoasnottoaffecttheassembly.3.3.8ballassembly,shouldensureassemblyquality,position,roundnessuniformballdiameter,ballassemblyassemblyshouldkeeptheball.3.3.9assembledtheballontheweldingjig,aholeisfixedonbothsidesoftheball,andwiththemachineslowlyrotating,rotatingacircle,adjustthebead,adjusttheheightadjustmentoftheweldingwire,weldingparameters,andthenusethesemiautomaticsubmergedarcweldingmachine(alsocanusegasshieldedweldingmachine)ofmultipassweldingofballflatbeadwelding,untilnow,nomorethanhigh.3.3.10theweldsshallbeinspectedbyultrasonicinspectionafterthetimeof24h.3.4barmachiningandinspection:Qualityinspectionof3.4.1steelpipebarbeforeblanking:appearance,size,varietyandspecificationshallcomplywiththedesignrequirements.Rodblankingshalltakeintoaccountthelengthvariationafterassembly.Inparticular,thesizeofthebartopassthroughshouldtakeintoaccountavarietyoffactors,suchasdeviationsfromtheball,resultinginminorvariationsinbarsize,Seasonalvariationsbringaboutroddeviation.Therefore,thebarmaterialshouldbecarefullyadjustedsize,topreventthematerialafterthebatcherror. 3.4.2barsshallbecheckedforbendingandshouldbecorrectediftheyarebent.Barshallbeopenedaftercuttinggroove,weldingClubwallthicknessoflessthan5mm,cannotbeopenedgroove.Thestudmustbeopened.3.4.3steelrodandthesealingplateassemblyrequirements:rodandsealplateassemblymusthavepositioningfixture,ensuretheconsistencyofthelengthofthebarassembly.Whentherodandthesealplatearefixed,thedepthandwidthofthebeadshallbechecked,andthesidesofthebarandthesealingplateshallbeopenedwith30degrees,andthereisagapof2~5mmtoensuretheweldingqualityofthesealingplate.Sealingplateweldingshouldbecarriedoutontherotatingweldingbracket,weldingseamshouldbeweldedthrough,plump,uniform,donotbitemeat.3.4.4steelrodandconeassemblyrequirements:rodandconeassemblymusthavepositioningfixture,maintainassemblyrodlength,rodandconeanchorsolid,checkthebeadwidthanddepth,rodandconeonthebilateral30degreegroove,and2~5mmclearance.Toensureweldpenetration.Theconeweldingshallbecarriedoutontherotatingweldingbracket,andtheweldshallbeweldedfully,evenlyanduniformlywithoutbitingthemeat.3.4.5boltsandballnetbarsshallbeembeddedinthehighstrengthboltsbeforethesmallsplicing.Beforetheembedment,thehighstrengthboltsshallbetestedonebyoneandtheexteriorqualityshallbechecked.Thehighstrengthboltsofdoubtshallnotbeembedded. 3.4.6weldingwillproducedamageofhighstrengthboltshasbeenburied,suchasflint,splashandotherphenomena,sointheassemblingandweldingofsteelbarbefore,Highstrengthboltsshouldbeburiedprotection,preventelectricityignitionarcandpreventsplashsplashingintothethread,itisusuallyintheburiedafterthepluspackageisprotected.3.4.7steelbargridproductprotection:steelbarsshallbepaintedwithantirustpaint,highstrengthboltsshouldbeprotectedtopreventcorrosionofsteelbar,thesamevariety,specificationsshouldbeneatly.Smalltrussunitof3.5steelgrid:Thesmalltrussunitofthesteelgridgenerallyreferstotheassemblyoftheweldingballnet.Theboltballgridcanbeinstalledaftertheassemblyoftherodandtheassemblyofthebearing,withoutcarryingoutthesmallspellingunit.3.5.1steelframeshallbetestedonstrengthoftheassembledsteelballbeforeitissmall,anditcanbestartedonlyafterconformingtotheregulation.3.5.2forsmallfightsiteclean-up,forsmallspellingunitsize,shape,positionlofting,marking.Accordingtothepreparationofagoodschemeofsmallassemblingproductionassemblydesignandassemblingofthefetalposition,fetalpositionshouldbeconsideredtofacilitateconvenient assemblyandbodiless.Topreventdeformationof3.5.3welding,assemblingthefetalposition,retesttheassemblysize.3.5.4weldedballgridhastwokindsoflinerandnoliner,wherealllinersshouldbelined,andtheballshallbefixedandfixedontheballfirst.3.5.5steelspacetrussweldingballsmallform:3.5.5.1oneballoneshotisthesimplestform,shouldpayattentiontosmallspellsizeandweldingquality.3.5.5.2aballrodtype,assemblingandweldingshouldpreventdeformation.3.5.5.3oneball,threepoletype.Afterassembly,attentionshouldbepaidtotheangleandsizeofsemi-finishedproductstopreventweldingdeformation.3.5.5.4oneshot,fourpoletype,Notethattheweldingdeformationshouldbeassembled,preventingdeformationoftheworkpiece,thegeneralshouldaddtemporarylinkinthelegs,keeptheangleandsize.3.5.6weldedballnetframeshouldbeweldedfirmlyafterwelding.Theweldingseamisfullandwelded.Theweldingslopeisuniform.Aftertheweldisexamined,ultrasonicexaminationisnecessary. 3.5.7smallsizeshouldbeconsistentwiththespellcheckunittothefactoryregulations:smallassemblingunitsforsinglecone,chordlength,coneheight+2.0mm;thelengthofthediagonalwindingis+3.0mm;lowernodescenteroffsetis2.0mm;Iftheunitisnotasinglecone,thecenterofthenodeallowstheoffsettobe2.0mm.Theweldedballjointandthecenterofthesteelpipeallowdeviationof1.0mm.Unitofsplicingin3.6weldedballnetframe:Intheconstructionofweldedballgrid,3.6.1canalsobeassembledinthegroundandassembledathighaltitude.Theassemblyformcanbedividedintostripshape,blocktype,blockshape,andsolidtype.Inthe3.6.2control,thesizeanddeformationoftheunitmustbesufficientlyrigidtoensurethegeometricinvarianceoftheunitaftertheassembly.Otherwise,temporaryreinforcementmeasuresshouldbetaken.3.6.3inordertoensurethesmoothassemblyofthegrid,inthestripandstrip,orblockandblockclosure,boltcanbeusedtoinstallmeasures.3.6.4erectionspellbracket,thepositionofthesupportbracketshouldbelocatedinthebottomnode.Thestentiscalculatedtodetermineitsbearingcapacityandstabilityand, ifnecessary,testpressuretoensuresafetyandreliability.Thesupportshouldalsobepreventedfromsinking.In3.6.5grid,theunitshouldreducetheintermediatetransportation.Incaseoftransportation,Measuresshouldbetakentopreventthegriddeformation.Assemblingandweldingof3.7steelgrid:Weldingprocedureandweldingsequenceshallbeworkedoutbeforeassemblyof3.7.1weldedballnetrack.Thecontentsofweldingcurrentandvoltage,operationmethod,weldinglayerandweldgroove,clearancenumber,etc.,isthekeytoensurethequalityofwelding:weldingsequenceweldingassemblylineisbetweenpoints,withdeformationcontrolcomponent.Theweldingtechnologyof3.7.2steelspacetrussisdifficultandrequireshighquality.Therefore,thenetworkstructureassemblyweldermusthaveallpositionwelderexaminationcertificate,thatis,withflat,vertical,horizontal,invertedstationtestcertificate,beforetheycanmountguard.Afterbaking,theinsulationmaterialshalluse3.7.3weldingassembly,inordertoensuretheweldingperformanceofmaterials.Weldingoperationof3.7.4steelgrid:3.7.4.1steelpipeweldingwithsteelballisthemainweldingseamofsteelgrid.Thestartingarcshallbe20to30mmonthe leftofthecenterlineofthesteelpipe,andthearcshallbearcinginthebeadtopreventtheburnoftheparentmaterial.3.7.4.2totheleftofthearctotherightsideofthewelding,thestripmethodusingobliquesawtoothmethod,topreventthelossofmoltenironandmeat,obliquesawtoothmethodshouldbeusedtopreventslagbackflow.Whenthe3.7.4.3electrodeto1/4circle,tograduallychangethetransportpractices,canbechangedtocrescenttransportpractices,whenapproachingtheupperpart,shouldusethereverseobliquesawtoothshapedtransport,preventthebiteofmeat.3.7.4.4weldarcintheweldcenterlineshouldbemorethan20~30mmarc,donothavetofillthecratercompletely.3.7.4.5thenweldedtheotherhalfofthesteelpipe,Fromtheweldcenterlineontherightsideofthe20~30mmarcwelding,totheleft,thezigzagmethod,graduallylefttowelding,untilnearly1/4circletocrescenttransport,whenweldedtotheupperpart,andthenusedinconformitywiththeprovisionstostartsmallspell.Thereversezigzagstripmakestheweldbeautifulandfullofshape.3.7.4.6arc.Whentheweldingelectrodegraduallyintotheupperpart,thisisclimbingweldinghasbecomeflatwhenthesteelpipetotheupperpart,thentheelectrodeshouldcontinuetoweldingthecenterlineof20~30mm,coveredwithaseam,untilitfillsthecrater. 3.7.4.7whenmultipassweldingisusedorthebeadgroovehasnotbeenfilled,theweldslagshallbecleanedandweldedcontinuouslyinaccordancewiththeaboveorderuntilitreachesthesizespecifiedbytheweld.3.8assemblyunitacceptance:The3.8.1assemblyunitshallcheckthelength,size,width,diagonaldimensionandlengthofthegrid,andshallbewithintheallowabledeviationrange.3.8.2checkthequalityofweldingball,andtestreport.3.8.3inspectionofbarqualityandrodtensileloadtestreport.3.8.4checkthehardnesstestvalueofhighstrengthboltsandcheckthetestreportofhighstrengthbolts.3.8.5checktheweldingqualityandweldappearancequalityoftheassemblyunit,mainlytopreventbitingmeat,bitethedepthofthemeatcannotexceed0.5mm;afterwelding24h,inspecttheinternalqualityoftheweldingseamwithultrasonictesting.qualitystandard4.1theprojectshallcomplywiththefollowingrequirements:4.1. 1thevarieties,models,specificationsandqualityofthesteelshallcomplywiththedesignrequirementsandthecurrentrelevantstandardsofthestate.Inspectionmethod:checksteelqualitycertificateorreinspectionreport.StandardSpecificationforsteelrulerorcaliperinspection.Thespecifications,varietiesandqualityof4.1.2weldingball,boltball,gussetplate,highstrengthbolt,taperhead,sealingplate,sleeveandrodshallcomplywiththedesignrequirementsandthecurrentrelevantstandardsofthestate.Inspectionmethod:checkqualitycertificate,exfactorycertificateandtestreport.4.1.3thesafetylevelofthebuildingstructureshallbelevelone,andthepublicbuildingnetworkstructurewithspanover40mandthequalityshallbedoubted,andthefollowingitemsshallbereexaminedatthesite;Theweldedjointof4.1.3.1shallbetestedaccordingtothedesignofthesteeltubeandball,andthebearingcapacityoftheone-wayaxleundertensionandcompressionshallbetested.4.1.3.2boltballjointsshallbetestedfortensilestrengthofthethreadofthemaximumboltholeofthefinishedball.Theresultshallbeinlinewiththecurrentrelevantstandardsofthestate. Inspectionmethod:checkthequalitycertificateandreinspectionreport.4.1.4weldingballsshouldberustremovedbeforeassembly,andcoatedwithantirustpaint.Methodofexamination:observationandexamination.4.1.5spacetrussstructureshallnotbeforcedtodeformduringassembly.Inspectionmethod:observation,inspectionandinspectionrecordofassembly.4.2thebasicitemsshallmeetthefollowingrequirements:Appearancequalityofweldedball,bolt,ballandrodafterassemblyof4.2.1:Qualified:partialconcaveandconvexofballsurfaceshouldnotbegreaterthanl.5mm,Surfaceoil,splash,etc.shouldbecleanedup.Good:thesurfaceoftheballshouldnotbemorethan1.0mmlocalbump,surfacegrease,splashandsoonshouldbecleanedup.Checkquantity:accordingtothenumberofnodes,check5%,butshouldnotbelessthan5.Testmethod:usingacurvedcovermould,feelerand observation.Appearancequalityofgussetplateandrodafterassemblyof4.2.2:Qualified:thesurfaceshouldbenoobviousconcaveanddamage,thescratchdepthshouldnotbegreaterthan0.5mm,weldingscars,burrsshouldbebasicallycleanup.Good:thesurfaceshouldbenoobviousconcave,damage,scratches,weldingscars,burrsshouldbecleaned.Checkthequantity;check5%bythenumberofnodes,butnotlessthan5.Testmethod:observationandexamination.4.3theallowabledeviationitemsshallcomplywiththefollowingprovisions:Theallowabledeviationitemsandinspectionmethodsofthesmallassemblingunitsofthe4.3.1spacetrussshallcomplywiththeprovisionsoftable5-20.Theallowabledeviationitemsandinspectionmethodsofthe4.3.2gridstructuredividedorseparatedandassembledshallconformtotheprovisionsoftable5-21.Checkthenumberoflandblockfullinspection.Theallowabledeviationitemsandinspectionmethodsofthe totalfloorerectionofthe4.3.3gridstructureshallcomplywiththeprovisionsoftable5-22.Inspectionquantity:fullinspection.Finishedproductprotection5.1smallassemblingunitsassembledshouldbeneatlystacked,notcluttered,preventdeformation.5.2gridsemi-finishedball,highstrengthboltsshouldbeplacedinacleanplace,topreventcontaminationofoil,topreventdamagetothescrew.Theallowabledeviationitemsandtestmethodsofsmallassemblingunitsofgridstructures5-20Itemallowabledeviation(mm)inspectionmethodCrossgussetplatewithanangleof+20"Crossgussetplateandcoverplatewithanangleof+20"TherodaxisunevennessL/1000cableandsteelcheckChordlengthofsinglecone=2.0mmTheheightoftheconeofasingleconeis+2.0mmSingleconewindingdiagonaldifference3.0mm Bottomnodecenterdeviation2.0mmsingleconeThecenteroffsetofassemblyunit2.0mmOffsetbetweenweldedballjointandsteeltubecenter1.0mmNote:LHuanShunfor?Theallowabledeviationitemsandtestmethodsofthegridstructuredividedintostripsorblocksareshownintable5-21Itemallowabledeviation(mm)inspectionmethodSinglespan+10Multispancontinuous+5Singlespan+20Multispancontinuous+10Theallowabledeviationitemsandtestmethodsofthetotalfloorerectionofthegridstructure5-22Itemallowabledeviation(mm)inspectionmethod+L/2000+30L/300030Theheightdifferencebetweenadjacentsupportsandadjacent supportsisL/40015Thebiggestdifferencewiththeruler,the30supportlevelexaminationTheelevationdifferenceofadjacentsupportofmultisupportgridisL1/80030L2/10005Note:1.Lisverticalandhorizontallength.2.L1isthedistancebetweenadjacentbearings.3.L2isthelengthofthemember.Five3aftertheunitisassembledinthegrid,transportationshouldbeavoidedtopreventthedeformationofthegridinthecourseoftransportation.5.4,aftertheendofthegridassembly,shouldbepaintedintimeantirustpaint,topreventcorrosionofthegrid.AttentionshouldbepaidtoqualityproblemsThedimensionofthesmallunitofthe6.1steelgridassemblyshouldbecontrolledinthenegativetolerance,andifthepositivetoleranceaccumulates,themeshsizewillincreaseandtheaxiswillbeshifted. 6.2thesteelframeshouldbecheckedregularly,topreventthediefrombeingoutofshapeandtodeformthesmallunit.6.3assembledsteelballsandrodsshallbenumberedandmarkedsoastopreventmixingwhenused.Thesteelballshouldalsohaveacentrallinesign,especiallyaribbedsteelball.Thedirectionofitsuseisstrictlyspecified,sothedirectionofitsassistanceshouldbeclearlymarked.6.4packingandshipment.Whenthesteelframeisassembled,thesemi-finishedproductsshouldbepacked.Thepackingshallbecarriedoutafterthedryingofthecoating.Thepackageshallprotectthecoatingfromdamage,ensurethatthecomponentsandpartsarenotdeformed,notdamagedorlost,andthepackingshallcomplywiththerelevantprovisionsoftransportation.QualityrecordThisprocessstandardshallhavethefollowingqualityrecords7.1weldingball,boltball,highstrengthboltmaterialproofandfactorycertificate,aswellastheabovevarieties,specificationsofthetensiletestreport.7.2materialcertificateofsteelandreexaminationreport.7.3weldingmaterialandcoatingmaterialproof,exfactorycertificate. 7.4materialofsleeve,taperheadandsealingplate,reportandexfactorycertificate,ifusingimportantsteel,shouldhaveweldabilitytestreport.Seven5thespecificationsandvarietiesofthesteelpipeshallbecertifiedorreexamined.7.6steelpipeandsealingplate,coneheadoftherodshouldhavebearingtestreport.Themovable(sliding)bearingofthe7.7steelgridshallhavethefactoryqualificationcertificateandthetestreport.7.8welderqualificationcertificate,withcorrespondingstationproject,correspondingweldingmaterialitems.7.9inspectionandacceptancedataofassemblyunit.7.10weldappearanceinspectionandacceptancerecord.7.11weldingseamultrasonicinspectionreportandrecord.7.12coatinginspectionandacceptancerecord.'