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Trouble Diagnosis and Elimination of Pipe Jacking Machine
2020-09-291.Noactionofthecorrectionsystem AΦ1800mmmuddywaterpressurizedpipejackingmachine(canbeexpandedto2000mm),thetotallengthoftherotaryexcavatorsystemis4705mm,thecutterheadtorqueis354kN·m,thecutterheadspeedis2.3r/min,andthedrivingpoweris30×3kW.Thestrokeofthecorrectionhydrauliccylinderis85mm,andthethrustofthecorrectionhydrauliccylinderis980kN×thetotalmassofthemainengine(t).Whenthepipejackingmachinewas200mawayfromthepipe,thecorrectionsystemfailedandthecorrectionactioncouldnotbegenerated,makingtheconstructionimpossible. Thecorrectionsystemoftherotaryexcavationsystemofthepipejackingmachineadoptsanelectro-hydraulicintegratedoperatingsystem,whichconsistsofahydraulicoiltank,anoilfilter,anoilfilterscreen,anelectricmotor,ahydraulicpump,aone-wayvalve,anoverflowvalve,apressuregauge,andasolenoidComposedofreversingvalve,hydrauliclock,overloadreliefvalve,mudwatertankelectromagneticreversingvalve,mudwatertankdoorreliefvalve,correctionhydrauliccylinderandothercomponents. Thehydraulicpumptransmitsthehydraulicoiltothecontrolvalve,andtransmitsittothecorrectionhydrauliccylinderaccordingtotherequiredcorrectionconditions.However,becausetheworkingpressureofthecorrectionhydrauliccylindercannotreachtherequired20MPa(only16MPa),thesystempressureislow.Thecorrectinghydrauliccylindercannotperformnormalcorrectingoperations. Thereasonsforthelowpressureofthecorrectionhydraulicsystemareasfollows:theoverflowvalvefails;theelectromagneticreversingvalveisseverelywornandcausesinternalleakage;thecorrectionhydrauliccylinderisleaked;theoilinletfilterisblocked;thepowerofthehydraulicpumpisreduced. Accordingtotheanalysisresults,adjustingthepressureoftheoverflowvalvehasnoobviouseffect;usingthetranspositionmethodtoreplacetheoverflowvalveofthesametypeinotherpartsfordebugginghasnoeffect,indicatingthattheoverflowvalveisgood.Checktheelectromagneticreversingvalve.Nooilleakage,loosevalvecoreanduncleargearsarefound,indicatingthattheelectromagneticreversingvalveisalsogood.Thepressuretestofthecorrectionhydrauliccylinderwascarriedout,thepressurewasnormal,andnointernalleakagewasfound.Theoilinletfilterwasremovedforinspection,andnoblockagewasfound.Finally,itisjudgedthatthepowerdropofthehydraulicpumpisthemaincauseofthefailure. Stopthecorrectionhydraulicsystem,cutoffthepowersupply,removethehydraulicpumpfromtheoiltank,replacethehydraulicpumpofthesamemodel,andrunthetestmachine.Thesystempressurecanreach26MPa,andthecorrectionworkisworkingnormally. 2.Thecorrectionsystemcannotcorrecttotheleft AΦ2000mmearthpressurebalancepipejackingmachine,afteroverhaulingtheelectricaloperation,hydraulicpressureandsoildumpingsystems,duringtheomni-directionaladjustmentandtestmachineprocess,itwasfoundthatthecorrectionsystemoftherotaryexcavationsystemdidnotmovetotheleft,andtheotherdirectionswerenormal. First,usethetranspositionmethodtotranspositiontheelectromagneticdirectionalvalveontheleftandright,buttheresultisthattheleftsidecannotbecorrected.Thentheleftandrighthydrauliccylindersaretransposedanddebugged,andtheleftsidestillcannotbecorrected.Throughtheabovetranspositiondebugging,itshowsthatthehydrauliccircuitofthecorrectionsystemisgood.Whencontinuingtheinvestigation,thefrontswingpartandtherearfollowerpartoftherotaryexcavationsystemweredisassembledandseparated,anditwasfoundthatthepipelinewaterproofrubberringatthejunctionofthefrontsteelshellandtherearsteelshellwasaginganddeformed,whichaffectedtheleftwardmovementofthecorrectionsystem. Theaginganddeformedpipewaterproofrubberringatthejunctionofthefrontsteelshellandtherearsteelshellwasreplaced.Afterthetestmachine,thecorrectionsystemmovedtotheleftnormally. 3.Failureofthereversingvalveofthehydraulicpumpstation Intheconstructionofsewagepipelines,afterthehydraulicpumpstationofthepipejackingmachineworkedcontinuouslyfor1h,thereversingvalvecouldnotbechangedsmoothlyasrequired,sometimesgoodandsometimesbad. Thehydrauliccircuitofthishydraulicpumpstationisrelativelysimple.Itusesthe4WE16G/EW220solenoiddirectionalvalve.After1hofoperation,thesolenoidvalveheatsupandcannotchangedirectionnormally. Removethesolenoiddirectionalvalve,surveyandmapthesolenoiddirectionalvalvebase,andfindamanualdirectionalvalvemodel4WMM16G50accordingtothesizeofthebase,anditworksnormallyafterinstallation. 4.Mudentersintothereducerboxofthespiralsoilconveyor AΦ3000mmearthpressurebalancepipejackingmachineundertakestheconstructiontaskofjackingΦ3000mmsteelpipeswithatotallengthof1km.Whentherotaryexcavationsystemwasdiggingto800m,itwasfoundthattherewasmudinthereducerboxofthespiralsoilconveyor. Therearetworeasonsforthisfailure:oneisthatthesealingringofthescrewshaftjournalisseverelywornandthejournalisnotwellsealed,whichcausessoiltoenterthereducerboxfromthescrewshaftjournal;theotheristhattheearthpressureofthespiralsoilconveyorisgreaterthanThepressureinthereducerboxcausessoiltoenterthereducerbox.However,thesealingringofthescrewshaftjournalisanewpartthatisreplacedbeforeconstructionandwillnotwearsoquickly.Therefore,theearthpressureisgreaterthanthepressureinthereducerboxasthemainreasonforthefailure.Itisunderstoodt
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The key to pipe jacking construction depends on the main jacking cylinder jacking
2020-09-23Pipejackingconstructionreferstotheconstructionprocessofjackingsteelpipes(includingmulti-sectionsteelpipes)orconcretepipesfrompointAtopointBbyhydraulicpowerwithoutdiggingtrenchesonthesurface.TheprocessprincipleandprocessofpipejackingconstructionTheMing-layingpipelineischangedtousemachineryasthedrivingforcetotransferthepipelinefrompointAtopointBunderthesurface.Themainmechanicalequipmentincludeshoistingequipment,high-pressureoilpumps,large-tonnagejacks,backpilesandbackbeams,guiderailsandexcavatedtools,theodolite,andlevel.Thefunctionandquantityofthemachinetoolsaredeterminedaccordingtothediameter,lengthandweightofthepipesectionbeingpushedinto. Pipejackingengineeringisasub-subjectoftrenchlessengineeringoraprocessoftrenchlessengineeringconstruction.Itisaconstructiontechnologythatpassespipelinesthroughauxiliaryequipmentwithoutexcavationsurface,andcanpassthroughroads,railways,rivers,groundbuildings,undergroundstructures,andvariousundergroundpipelines.Thepipejackingprojectmainlyreliesonthethrustofthemainjackingcylinderandtherelayroombetweenthepipelinestopushthetoolpipeortheroadheaderfromtheworkingwellthroughthesoiltothereceivingwellandatthesametimepushthepipelineintotheworkinghole.Thepipelineispushedinbythemainjackingcylinder,andpeopleusuallycallthiskindofprojectapipejackingproject. Processcharacteristicsandscopeofapplication:Pipejackingundertheroad,andtheroadisunblocked;thepipejackingunderthebuildingdoesnotaffectthefunctionofthebuilding;shortensthepipelinelayingcycleandreducestheprojectcostsignificantly;theequipmentissingleandtheoperationissimple;itissuitableforrailways,highwaysanddifficultorUndergroundpipelineconstructionthatisnotsuitablefortrenchexcavation.
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Risk management in pipe jacking machine
2020-09-23Theriskmanagementinthepipejackingmachineistoanalyzetherisksinthepipejackingmachinethroughriskidentification,riskestimationandriskevaluation.Basedonthis,avarietyofmethodsandmeansareusedtoeffectivelyimplementtherisksinvolvedinthepipejackingmachine.Itisageneraltermforthewholeprocessofcontrollingtheriskevents,maximizingthebeneficialresultsoftheriskevents,andproperlyhandlingtheadverseconsequencescausedbytheriskevents.Includingseveralstagessuchasriskidentification,riskevaluationandriskcontrol. 1.Identificationofrisks 1)Factorsinhydrogeologyandengineeringgeology.Thegeologicalsoillayerwherethepipejackingmachineislocatedchangesfrequently.Ifthehydrogeologicaldataisinaccuratebeforeconstructionstarts,constructionaccidentswillbecaused. 2)Influencingfactorsindesign.Thereliability,scientificity,andpertinenceofthedesignplanwillalsoaffecttheconstructionprocess. 3)Constructionfactors.Theselectionofconstructionmethods,theselectionofconstructionequipment,thedeploymentofpersonnelandthequalityofpersonnelwillallaffecttheconstruction. 4)Economicfactors.Forexample,thecostoftheprojectandtheavailabilityoffundswillaffecttheorganizationandmanagementoftheconstructionunit.Ifthebidpriceoftheprojectislowandthefundsarenotinplaceintime,thecontractor'sinvestmentinordertoreducecostsandreducetheinvestment,aswellastheflukepsychology,willalsoaffecttheconstruction. 5)Factorsrelatedtosupervisionandowners.Iftherelevantmanagementpersonnelhaveinsufficientprofessionalknowledgeandpoormanagementcapabilities,blindlycommandandtakerisksduringtheconstructionprocess,itwillalsoaffecttheconstruction. 2.EvaluationofriskThegeologicalandsoillayersalongthepipelinechangefrequently,sounderstandthechangesofthegeologicalandsoillayersbeforethepipejackingmachine.Inaddition,thesoftfoundations,karstcavesandothersectionstobepassedthroughneedtobetreatedinadvancetopreventexcessivesurfacesubsidencefromcausingroads.Collapse.Atthesametime,whencrossingtheriver,theoverburdenandthegeologyofthebottomoftheriverbedshouldbeascertained,andtheelevationduringjackingshouldbecontrolledtopreventtheinfluxofriverwaterduetothebreakthroughofthesoillayer.
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What are the characteristics and parameters of the main jack cylinder and the main jack pump station?
2020-09-14主顶油缸、主顶泵站的特点和参数？
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