文献翻译提升机基础设计的几个问题.docx

文献翻译提升机基础设计的几个问题.docx

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文献翻译提升机基础设计的几个问题

原文：

Hoistthebasicdesignofseveralissues

Abstract:

Thispaperhoistandloadtransferbetweentheconcretefoundationforamoredetailedanalysis;comparedwiththenormsonthebasisofthedeterminationofstabilityfactoronthebasisofthestabilityofthehoistrecommendationsCoefficientvalue;andsetsouttoimprovetheupgrade ResistanceCapabilityofmachinebasemeasuresfordesign.

Keywords:

localpressure;shearkeys;overturning;anti-slip;stability

Preface

Surfacecoalminehoistroomisanimportantpartoftheproductionsystem. TiedwithDerrickimportantstructuresfortheupgradingofthesystem. Withtheincreaseincoalproductioncapacity,upgradingtheprevioussingle-modecannolongermeettheneedsofmodernproduction,theprogressivedevelopmentofmulti-round,multi-ropeliftingway. Enhancetherope'spullalsoincreasedandroleoftensionbasedonthehoistisalsogrowing. Thepast,thebasisofasingleShengtiliftweightalonecanmeettherequirementstoenhancethestabilityofmachine. Requirementsmayconstructthefoundationmadeofplainconcretefoundation. Mineisalargemachineusedinmultirope,thenpartofthefoundationalonehoistweightfallsfarshortofbasicstability. Needtobroadenthebasisofweightorothertechnicalmeasuresusingotheranchor. Therebyenhancingmachine-baseddesignraisesnewproblemsandnewdemands,moreandmoreattentionbytheengineeringandtechnicalpersonnel.

1Hoist-basedstressanalysis

1.1Determinationofhoistropetension

Wireropeatoneendandraisethecontainerskiporcageconnectedtotheotherendisconnectedwiththehoistdrum. Derrickandhoistthroughthesupportformthebasisofforcebalancesystem. Therefore,thewireropeintheropeloadderrickloadcanindeed .Determinedasfollows:

1）Thenormalworkloadwhenthehoistrope（Qk）Standardvalue:

press"Mineheadframedesign"GB50385-2006No.41113inthecalculation. 

2）whenthewireropeoffropeload（Ak）standardvaluesforsingle-ShengTil,inwhicharopeforthebreakShengHesetout,theother2timesthenormalload;formultirope,ofwhichthesideShengHesetallthebrokenrope,theothersideofthe0133timesforalltheropeoffShengHeset.

1.2Hoistequipmentandbasicloadtransferbetween

Generalequipmentmanufacturerstoprovideinformationtoenhancemachine-based,andstructureassociatedwith:

Equipmentandsizepointoftheforce,Hole,casing,boltsandsteelshearkeysandsoon. Figure1.

KnownbytheFigure1:

hoistbyboltsintension,shearsteelshearkeytothelevelofforcetransmissiontothefoundation. 

Hoistthebasisofthewhole,forthemassivefoundation. Computationalmodelofarigidbody,basedonrelativelylittlebetweenthevariouspartsofdeformation,stresslevelislow,generallymayfromtimetocalculateanoverallstrength. 70'sRedFlagFactoryinthe20thcenturybrandcompressorassembly-baseddeterminationofthesurfaceofsteelstressisonly70~140N/cm2[1]. Thelargevolumeofconcretefoundationconstructionconcretehydrationheatinordertopreventtheformationofinternalandexternaltemperature,andthetemperaturecracks,generallyrequirebasicstructuralsteelsurfaceconfiguration. Butintheelevatorequipmentandthedirectinteractionbetweentheconcretefoundationofsomeofthestressconcentrationsignificantly,theneedforcomputingandreinforcement,thedesignerofteneasytooverlook.Mainlyforthefollowingtwoparts:

thebasisofconcretelocalofficeboltpressureplate,steelembeddedinconcreteshearkeypart. Thetwositesofforcetransmissiontothebasehoistthekeypartsofthedesignshouldenhancethemachine-basedreinforcementcalculationoflocalstressandattention. Thefollowingdetaileddiscussionofthesetwopartsseparately.

1.2.1Partialpressureofconcrete

Generalboltsprovidedbythemanufacturer,askedthelocationofcivilengineeringprofessioninthecorrespondingburiedsteelcasing,elevatorboltandpullthroughthenutonthelocalpressureofconcretedeliveredtotheconcretefoundation. Concretelocalforcemodelsimilartotheanchorplatewithend. Concreteinthebase450alongthefailuresurfacediffusiontoformacone. Inordertoavoidbrittlefracture,canbeextendedtoformalargerconeboltfailuresurface,oraroundthebolttoconfigurethereinforcedconcretesothattheboltpullinwholeorinpartbythereinforcedpassedon. Atthispointrequestedbythedestructionoftensilereinforcementintheconebaseplaneandthelowerpartofthelengthofnotlessthanthetensilereinforcementanchoragelength.

 Nutwasherinconcreteinthelocalcompressivestressisconcentrated,inordertopreventlocalcrushingofconcrete,thisshouldbepartofthereinforcedconcreteconfigurationindirectbinding,thespecificcalculationandconstructionrequirementsseethe"designofconcretestructures"GB50010-2002relatedtotherequirementsofsection .

Manufacturerstoprovidetheembeddedsteelcasingandinternalboltgapbetweentherelativelylarge,refertotheanchorprestressinganchorageendstheconstructionrequirements,shouldsetthebasisforconcreteandsteelpipeweldedsteelplateembedded. Steelplatesizetonomorethanthereservedendsboltholewidthisappropriate. Setofsteelplatehastheadvantageofstresscanbefurtherspreadandreducethestresslevelofconcretearoundthecasing.

3.AmericanPetroleumInstitute,Spec!

fication/brWireRope.APISpec（fication9A（Spec9A）,23rdedn.Washington,DC,1984.

4.Djivre,M.,MineShaJ~Ropes:

OntarioDestructit~eWireTestin,qProgram.OntarioMinistryofLabour,Sudbury,Ontario,16January1991,p.5.

2Calculatedbasedonthestabilityofthehoist

Hoistbyboltsandsteelandconcreteshearkeybasefusedtoworktogether. Ropeforceupgradeprocessrequirementsunderthedirectionofthehorizontalangleisgenerallynotlessthan50°. Improvethelevelandtheverticalcomponentropearerelativelylarge,androughlyequal. Enhancethepullropeonadiagonalbasisofthestabilityofnegativefactors. Therefore,thestabilityoftheneedforbasiccomputing. Stabilitycalculationbasedalsoincludestwoaspects:

thebasisandfoundationforoverturningtheanti-slip.

2.1Overturningthebasisofcalculation

2.1.1Overturningstabilitycalculationsdeterminetherotationaxis

Hoistbyboltsandsteelandconcreteshearkeybasefusedtoworktogether. Ropeforceupgradeprocessrequirementsunderthedirectionofthehorizontalangleisgenerallynotlessthan50°. Improvethelevelandtheverticalcomponentropearerelativelylarge,androughlyequal. Enhancethepullropeonadiagonalbasisofthestabilityofnegativefactors. Therefore,thestabilityoftheneedforbasiccomputing. Stabilitycalculationbasedalsoincludestwoaspects:

thebasisandfoundationforoverturningtheanti-slip.

2.2Calculatedbasedonanti-slip

Therearetwopossibilitiesbasedonsliding,asurface-basedsubstrateandthesubstratetoovercomethefrictionbetweensoilandslidingalongthesubstratesurface. Anotherlevelofforcetoovercometheinternalfrictionofsoiltofoundationandthebearinglayerofsoilwiththeslidingpart. Thelattergenerallydifficulttooccurbecausethesubstratetoallowthegeneralstressofacertainsafetyfactor,whichguaranteesthebasalsoilwillnotproducelocalizedplasticflowtoachievetheultimatebalance. Therefore,theonlycasebeforetheanti-slidestabilitychecking. 

   Intheslidetherearetwofavorablefactorsinthecalculationarenottakenintoaccount. ①roomwithacertainthicknessofconcretemadeonthebasisofrigidanti-slideflooreffect,infact,reasonablyrigidfloorstructurehasagoodfoundationtopreventslidingfunction;②backfillaroundthesolidbasisofaroleinstabilizingcertainbasic effect. Alsobasedonthefoundationsoilbeforethepassiveearthpressurearegenerallynotconsideredbecauseofpassiveearthpressureoftenassociatedwiththebasisoffullslidingoccurs,andisnowcommonlyusedCoulombtheorytoyieldthevalueofpassiveearthpressureistoolarge. Therefore,takentogether,canreducethesafetyfactoragainstsliding,especiallyinthecaseofaccidentalloads.

   "Mineheadframedesign"GB50385-2006providesthat:

derrick-basedanti-slipstabilityfactorof112. Alsoprovides:

thefoundationandbasisfor,fromtimetobrokenrope,anti-droppingbrakingeffectofseismicloadeffectandthecombinationofchecking. 

   Therefore,thebasisfortheelevator（squat-typeshallowfoundation）intheoffShengHesetstableundertheactionofanti-slipcoefficientismoreappropriateforthe111~112,projectscanbeeconomical.

3Otherissuesneedingattention

1）Sometimes,inordertoincreasethebasisofweight,oftenthereducer,motorbaseandhoistbaseasasingleentity. Atthispoint,therearecenter-basedforcetogetherwiththeprojectionropehoistpositionofgreatereccentricity. Inthedesignbasisshouldbeadjustedtosomeofthegroundbelow,sothatthecenterofthetwoascloseaspossible. Weightinordertofullymeetthetheoreticalassumptions. 

2）Astheelevatorbasedonthedesignlayoutofthemainstructurebythesurroundinglayoutandcannotre-expandsize. Canbetakentoincreasetheanti-slide,anchorandupliftpiles. ToensurethatthefoundationShengHesetoffunderthestability. 

3）Toimprovethecapacityofhoist-basedslidingtheoptionfollowingstructuralmeasures:

①setrigidfloor,foundationbackfillaroundthefillinglayercompactingram;②forsoilunderthefoundationunderside;③increaseDepthofFoundation; ④headframeandhoistroombasedontheactuallayoutofthesituation