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

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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
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1. Main top cylinder

The main jacking cylinder is installed in the jacking work pit and is used to jack the pipeline into the soil. Most of its form is a hydraulically driven piston type double-acting cylinder. The characteristic of this double-acting cylinder is that it can be extended or retracted; the main jack cylinders currently used are mostly double-acting cylinders, the most typical being the double-acting cylinders. This double-acting jacking cylinder is mainly composed of six parts: cylinder block, piston, piston rod, guide sleeve, seal and sliding shoe. Among them, the cylinder body is the main part of the jack and must have sufficient wear resistance and pressure resistance. Most of its material is 45# seamless steel pipe, which can also be made of forged steel and cast steel. The cylinder body generally needs multiple processes such as turning, boring, rolling, and heat treatment to complete, and its machining accuracy requirements are relatively high.

Pistons are mostly made of ductile iron and copper alloy. There are two types of piston rods: hollow and solid, and they are generally forged with 45# steel.

The guide sleeve is a ring that acts as a guide when the piston reciprocates. It is fixed on the front edge of the cylinder and the surface is in close contact with the surface of the piston rod. It must have good wear resistance and high strength. It is generally used Made of high-quality copper alloy.

Since the jack is a closed pressure vessel, the moving part of the piston, the static part between the end cover and the cylinder tube all need to be reliably sealed. There are various types of seals. Static seals often use "O"-shaped rubber seals, while dynamic seals generally use "U", "V", and "L"-shaped seals.

The equal thrust main jack cylinder is a new type of secondary cylinder. Its characteristic is that the thrust of the first stage and the second stage are equal, and the stroke of the second stage cylinder is the same and longer. Pipe jacking construction using this cylinder can increase the stroke without additional jacking iron, which can greatly improve the efficiency and safety of pipe jacking construction.

The power unit of jacking equipment (such as hydraulic work station, etc.) and jacking equipment are usually separated, but sometimes they can be integrated. In the arrangement of jacking equipment in pipe jacking construction, the number of jacking cylinders can be any number greater than 2. The total jacking capacity of jacking cylinders is related to the load-bearing capacity of the jacking pipe section. At the same time, larger ones should be considered. There is a certain safety margin in the case of the initial top force. When jacking into the box-type pipe section, the number of jacks can sometimes reach 20 sets, and the total jacking capacity can reach several thousand tons.

In the process of pipe jacking, a two-stage or three-stage telescopic cylinder can be used to apply continuous jacking force. The maximum stroke of this cylinder can reach 4000mm, which is suitable for most pipeline jacking. This kind of oil cylinder is usually fixed on the back seat of the working well, and its base part is quite long, and a long working well is also required in the retracted state.

The second type of jacking method, the jacking frame is equipped with a short-stroke cylinder (stroke is only 300mm), but the jacking frame can be moved along its lower base, and can be locked in by a suitable groove pin device On the pedestal. After the end of each stroke of the jacking, release the jacking frame and move forward, and then re-lock, jacking into the next stroke.

The third jacking method is to keep the position of the jacking cylinder unchanged, and use concrete or steel spacers to extend the jacking length after each jacking process. When multiple spacers are used, in order to avoid danger, corresponding locking measures should be adopted for the spacers.

In addition to the above-mentioned jacking method, there is also a main jacking device composed of a combined oil cylinder. Multiple cylinders work together on a steel back plate to ensure that the jacking force is evenly transmitted to the rear seat wall; in addition, the pressure equalizing ring at the front can evenly distribute the pressure on the end surface of the jacking pipe Here, the structure and shape of the equalizing ring are required to be consistent with the end surface of the pipeline. At the same time, the thrust cylinder and the equalizing ring are connected by a spherical hinge, which is also conducive to the uniform transmission of the pushing force.

2. Guiding (correcting) cylinder

The guide cylinder is installed behind the first pipe or tool pipe to adjust the deviation of the elevation and axis. The stroke of the guide cylinder is generally 50~100mm, and the jacking force is 500~1000kN. During construction, the tonnage value of the guide cylinder should be selected according to factors such as pipe diameter, jacking method, tool pipe length, and geological conditions. Figure 4-5 shows the structure of the guide cylinder. In order to adapt to the change in the angle of the tool tube during correction, the two ends of the guide cylinder are not parallel. In order to avoid the eccentric force of the guide cylinder, consider that one end of the jack is hinged and the other end is spherical, so that it can be adjusted by itself so that the guide cylinder can bear the axial pressure to ensure good working conditions of the guide cylinder.

3. Relay station cylinder

The oil cylinder of the relay station is installed in the middle of the jacking pipeline as a relay jacking tool, and is also a piston-type, double-acting jack. However, the stroke is shorter than that of the main jack cylinder, so as to prevent the relay room from being too long. The tonnage depends on the installation position of the relay room in the jacking pipeline. According to the working performance of the relay station, the oil cylinders of the relay station should be arranged evenly to achieve the purpose of evenly applying the jacking force. The capacity of the oil cylinder of the relay station is generally not more than 1000kN. It is required to make as many units as possible with small tonnage, and arrange them evenly in the circumferential direction.

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Main jacking cylinder for pipe jacking, guiding (correction) cylinder, and intermediate cylinder

Main jacking cylinder for pipe jacking, guiding (correction) cylinder, and intermediate cylinder

Main jacking cylinder for pipe jacking, guiding (correction) cylinder, and intermediate cylinder