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Main jacking cylinder for pipe jacking, guiding (correction) cylinder, and intermediate cylinder
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- Time of issue:2020-09-10 15:13
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(Summary description)1.Maintopcylinder Themainjackingcylinderisinstalledinthejackingworkpitandisusedtojackthepipelineintothesoil.Mostofitsformisahydraulicallydrivenpistontypedouble-actingcylinder.Thecharacteristicofthisdouble-actingcylinderisthatitcanbeextendedorretracted;themainjackcylinderscurrentlyusedaremostlydouble-actingcylinders,themosttypicalbeingthedouble-actingcylinders.Thisdouble-actingjackingcylinderismainlycomposedofsixparts:cylinderblock,piston,pistonrod,guidesleeve,sealandslidingshoe.Amongthem,thecylinderbodyisthemainpartofthejackandmusthavesufficientwearresistanceandpressureresistance.Mostofitsmaterialis45#seamlesssteelpipe,whichcanalsobemadeofforgedsteelandcaststeel.Thecylinderbodygenerallyneedsmultipleprocessessuchasturning,boring,rolling,andheattreatmenttocomplete,anditsmachiningaccuracyrequirementsarerelativelyhigh. Pistonsaremostlymadeofductileironandcopperalloy.Therearetwotypesofpistonrods:hollowandsolid,andtheyaregenerallyforgedwith45#steel. Theguidesleeveisaringthatactsasaguidewhenthepistonreciprocates.Itisfixedonthefrontedgeofthecylinderandthesurfaceisinclosecontactwiththesurfaceofthepistonrod.Itmusthavegoodwearresistanceandhighstrength.ItisgenerallyusedMadeofhigh-qualitycopperalloy. Sincethejackisaclosedpressurevessel,themovingpartofthepiston,thestaticpartbetweentheendcoverandthecylindertubeallneedtobereliablysealed.Therearevarioustypesofseals.Staticsealsoftenuse"O"-shapedrubberseals,whiledynamicsealsgenerallyuse"U","V",and"L"-shapedseals. Theequalthrustmainjackcylinderisanewtypeofsecondarycylinder.Itscharacteristicisthatthethrustofthefirststageandthesecondstageareequal,andthestrokeofthesecondstagecylinderisthesameandlonger.Pipejackingconstructionusingthiscylindercanincreasethestrokewithoutadditionaljackingiron,whichcangreatlyimprovetheefficiencyandsafetyofpipejackingconstruction. Thepowerunitofjackingequipment(suchashydraulicworkstation,etc.)andjackingequipmentareusuallyseparated,butsometimestheycanbeintegrated.Inthearrangementofjackingequipmentinpipejackingconstruction,thenumberofjackingcylinderscanbeanynumbergreaterthan2.Thetotaljackingcapacityofjackingcylindersisrelatedtotheload-bearingcapacityofthejackingpipesection.Atthesametime,largeronesshouldbeconsidered.Thereisacertainsafetymargininthecaseoftheinitialtopforce.Whenjackingintothebox-typepipesection,thenumberofjackscansometimesreach20sets,andthetotaljackingcapacitycanreachseveralthousandtons. Intheprocessofpipejacking,atwo-stageorthree-stagetelescopiccylindercanbeusedtoapplycontinuousjackingforce.Themaximumstrokeofthiscylindercanreach4000mm,whichissuitableformostpipelinejacking.Thiskindofoilcylinderisusuallyfixedonthebackseatoftheworkingwell,anditsbasepartisquitelong,andalongworkingwellisalsorequiredintheretractedstate. Thesecondtypeofjackingmethod,thejackingframeisequippedwithashort-strokecylinder(strokeisonly300mm),butthejackingframecanbemovedalongitslowerbase,andcanbelockedinbyasuitablegroovepindeviceOnthepedestal.Aftertheendofeachstrokeofthejacking,releasethejackingframeandmoveforward,andthenre-lock,jackingintothenextstroke. Thethirdjackingmethodistokeepthepositionofthejackingcylinderunchanged,anduseconcreteorsteelspacerstoextendthejackinglengthaftereachjackingprocess.Whenmultiplespacersareused,inordertoavoiddanger,correspondinglockingmeasuresshouldbeadoptedforthespacers. Inadditiontotheabove-mentionedjackingmethod,thereisalsoamainjackingdevicecomposedofacombinedoilcylinder.Multiplecylindersworktogetheronasteelbackplatetoensurethatthejackingforceisevenlytransmittedtotherearseatwall;inaddition,thepressureequalizingringatthefrontcanevenlydistributethepressureontheendsurfaceofthejackingpipeHere,thestructureandshapeoftheequalizingringarerequiredtobeconsistentwiththeendsurfaceofthepipeline.Atthesametime,thethrustcylinderandtheequalizingringareconnectedbyasphericalhinge,whichisalsoconducivetotheuniformtransmissionofthepushingforce. 2.Guiding(correcting)cylinder Theguidecylinderisinstalledbehindthefirstpipeortoolpipetoadjustthedeviationoftheelevationandaxis.Thestrokeoftheguidecylinderisgenerally50~100mm,andthejackingforceis500~1000kN.Duringconstruction,thetonnagevalueoftheguidecylindershouldbeselectedaccordingtofactorssuchaspipediameter,jackingmethod,toolpipelength,andgeologicalconditions.Figure4-5showsthestructureoftheguidecylinder.Inordertoadapttothechangeintheangleofthetooltubeduringcorrection,thetwoendsoftheguidecylinderarenotparallel.Inordertoavoidtheeccentricforceoftheguidecylinder,considerthatoneendofthejackishingedandtheotherendisspherical,sothatitcanbeadjustedbyitselfsothattheguidecylindercanbeartheaxialpressuretoensuregoodworkingconditionsoftheguidecylinder. 3.Relaystationcylinder Theoilcylinderoftherelaystationisinstalledinthemiddleofthejackingpipelineasarelayjackingtool,andisalsoapiston-type,double-actingjack.However,thestrokeisshorterthanthatofthemainjackcylinder,soastopreventtherelayroomfrombeingtoolong.Thetonnagedependsontheinstallationpositionoftherelayroominthejackingpipeline.Accordingtotheworkingperformanceoftherelaystation,th
Main jacking cylinder for pipe jacking, guiding (correction) cylinder, and intermediate cylinder
(Summary description)1.Maintopcylinder Themainjackingcylinderisinstalledinthejackingworkpitandisusedtojackthepipelineintothesoil.Mostofitsformisahydraulicallydrivenpistontypedouble-actingcylinder.Thecharacteristicofthisdouble-actingcylinderisthatitcanbeextendedorretracted;themainjackcylinderscurrentlyusedaremostlydouble-actingcylinders,themosttypicalbeingthedouble-actingcylinders.Thisdouble-actingjackingcylinderismainlycomposedofsixparts:cylinderblock,piston,pistonrod,guidesleeve,sealandslidingshoe.Amongthem,thecylinderbodyisthemainpartofthejackandmusthavesufficientwearresistanceandpressureresistance.Mostofitsmaterialis45#seamlesssteelpipe,whichcanalsobemadeofforgedsteelandcaststeel.Thecylinderbodygenerallyneedsmultipleprocessessuchasturning,boring,rolling,andheattreatmenttocomplete,anditsmachiningaccuracyrequirementsarerelativelyhigh. Pistonsaremostlymadeofductileironandcopperalloy.Therearetwotypesofpistonrods:hollowandsolid,andtheyaregenerallyforgedwith45#steel. Theguidesleeveisaringthatactsasaguidewhenthepistonreciprocates.Itisfixedonthefrontedgeofthecylinderandthesurfaceisinclosecontactwiththesurfaceofthepistonrod.Itmusthavegoodwearresistanceandhighstrength.ItisgenerallyusedMadeofhigh-qualitycopperalloy. Sincethejackisaclosedpressurevessel,themovingpartofthepiston,thestaticpartbetweentheendcoverandthecylindertubeallneedtobereliablysealed.Therearevarioustypesofseals.Staticsealsoftenuse"O"-shapedrubberseals,whiledynamicsealsgenerallyuse"U","V",and"L"-shapedseals. Theequalthrustmainjackcylinderisanewtypeofsecondarycylinder.Itscharacteristicisthatthethrustofthefirststageandthesecondstageareequal,andthestrokeofthesecondstagecylinderisthesameandlonger.Pipejackingconstructionusingthiscylindercanincreasethestrokewithoutadditionaljackingiron,whichcangreatlyimprovetheefficiencyandsafetyofpipejackingconstruction. Thepowerunitofjackingequipment(suchashydraulicworkstation,etc.)andjackingequipmentareusuallyseparated,butsometimestheycanbeintegrated.Inthearrangementofjackingequipmentinpipejackingconstruction,thenumberofjackingcylinderscanbeanynumbergreaterthan2.Thetotaljackingcapacityofjackingcylindersisrelatedtotheload-bearingcapacityofthejackingpipesection.Atthesametime,largeronesshouldbeconsidered.Thereisacertainsafetymargininthecaseoftheinitialtopforce.Whenjackingintothebox-typepipesection,thenumberofjackscansometimesreach20sets,andthetotaljackingcapacitycanreachseveralthousandtons. Intheprocessofpipejacking,atwo-stageorthree-stagetelescopiccylindercanbeusedtoapplycontinuousjackingforce.Themaximumstrokeofthiscylindercanreach4000mm,whichissuitableformostpipelinejacking.Thiskindofoilcylinderisusuallyfixedonthebackseatoftheworkingwell,anditsbasepartisquitelong,andalongworkingwellisalsorequiredintheretractedstate. Thesecondtypeofjackingmethod,thejackingframeisequippedwithashort-strokecylinder(strokeisonly300mm),butthejackingframecanbemovedalongitslowerbase,andcanbelockedinbyasuitablegroovepindeviceOnthepedestal.Aftertheendofeachstrokeofthejacking,releasethejackingframeandmoveforward,andthenre-lock,jackingintothenextstroke. Thethirdjackingmethodistokeepthepositionofthejackingcylinderunchanged,anduseconcreteorsteelspacerstoextendthejackinglengthaftereachjackingprocess.Whenmultiplespacersareused,inordertoavoiddanger,correspondinglockingmeasuresshouldbeadoptedforthespacers. Inadditiontotheabove-mentionedjackingmethod,thereisalsoamainjackingdevicecomposedofacombinedoilcylinder.Multiplecylindersworktogetheronasteelbackplatetoensurethatthejackingforceisevenlytransmittedtotherearseatwall;inaddition,thepressureequalizingringatthefrontcanevenlydistributethepressureontheendsurfaceofthejackingpipeHere,thestructureandshapeoftheequalizingringarerequiredtobeconsistentwiththeendsurfaceofthepipeline.Atthesametime,thethrustcylinderandtheequalizingringareconnectedbyasphericalhinge,whichisalsoconducivetotheuniformtransmissionofthepushingforce. 2.Guiding(correcting)cylinder Theguidecylinderisinstalledbehindthefirstpipeortoolpipetoadjustthedeviationoftheelevationandaxis.Thestrokeoftheguidecylinderisgenerally50~100mm,andthejackingforceis500~1000kN.Duringconstruction,thetonnagevalueoftheguidecylindershouldbeselectedaccordingtofactorssuchaspipediameter,jackingmethod,toolpipelength,andgeologicalconditions.Figure4-5showsthestructureoftheguidecylinder.Inordertoadapttothechangeintheangleofthetooltubeduringcorrection,thetwoendsoftheguidecylinderarenotparallel.Inordertoavoidtheeccentricforceoftheguidecylinder,considerthatoneendofthejackishingedandtheotherendisspherical,sothatitcanbeadjustedbyitselfsothattheguidecylindercanbeartheaxialpressuretoensuregoodworkingconditionsoftheguidecylinder. 3.Relaystationcylinder Theoilcylinderoftherelaystationisinstalledinthemiddleofthejackingpipelineasarelayjackingtool,andisalsoapiston-type,double-actingjack.However,thestrokeisshorterthanthatofthemainjackcylinder,soastopreventtherelayroomfrombeingtoolong.Thetonnagedependsontheinstallationpositionoftherelayroominthejackingpipeline.Accordingtotheworkingperformanceoftherelaystation,th
- Categories:Technical Services
- Author:
- Origin:
- Time of issue:2020-09-10 15:13
- Views:
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Address: Wujian Industrial Park, Jiangdu District, Yangzhou City, Jiangsu Province,China
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