Construction technology of pipe jacking machine

Categories:Technical Services
Author:
Origin:
Time of issue:2019-12-25 16:19
Views:

(Summary description)Accordingtothegeologicalreportandcombinedwiththecompany'sconstructionexperience,thepipejackingheaddecidedtousetheairpressurebalancegrid(waterflushing)headforconstruction.Duringthejackingprocessofthenose,theairpressurebalancesthefrontsoilpressuretostabilizethenose,reducingtheinfluenceofexternalsoilonthesurroundingground.Jackingequipmentandjackingprocess(1)Mainroof:4setsof200tons/setjacksareusedasthemainjacks,andthejackstrokeis1.4meters.Thejackpowerisprovidedbyanoilpump.Thebackendofthejackusesatrackwoodandapressuredividerringtouniformlyactontheworkingwell,andthefrontendpushesintothepressuredividerring,andthetopirontransmitsthejackingforcetothepipesection.Thepressuredividerringismadewithsufficientrigidity,anditisrelativelysmoothincontactwiththeendsurfaceofthepipewithoutdeformation.(2)Relayroom:Intheprocessoflong-distancejacking,whenjackingresistanceexceedstheallowabletotaljackingforce,andthejackingdistancecannotbereachedatonetime,therelayjackingmustbesetupinsections.Whenthejackinglengthofthispipejackingprojectexceeds100meters,itisconsideredtosetuparelayroombehindthemachineheadandadoptthethixotropicmudgroutingprocess.Therelayroomiscomposedofafrontshell,ajackandarearshell.Thefrontshellisconnectedwiththefrontconnectingpipe,therearshellisconnectedwiththerearconnectingpipe,andthefrontandrearshellsaresocket-typeconnections.Thetwoaresealedbyarubberwaterstoptopreventwater,soilandslurryoutsidethepipelinefromflowingintothepipeline. Eachrelayroomisequippedwith10jacks,eachwithajackingforceof30tons,andthejacksareevenlyarrangedalongthecircumference.Thestrokeofthejackis28cm,anditisfixedonthefronthousingwithafastenermadeofflatiron.Thesteelshellstructureisfinishedtoensurethatitdoesnotdeformduringuse.Theouterdiameteroftheshelloftherelayroomisthesameastheouterdiameterofthepipesection,whichcanreducesoildisturbance,groundsettlementandjackingresistance.Afterthepipeispushedthrough,thejacksandvariousaccessoriesareremoved,andthegapbetweentheshellandtheinnerwallofthepipesectionisfilledwithfinestoneconcrete.(3)Interface: Thepipejointinterfaceismainlycomposedofoutercasingring(steelcollar)rubberwaterstopandsoftsoilliner.Thesteelcollarcannotbedeformedduringthetransportationandliftingprocessfromtheprocessingsitetothesite,andtheinterfaceisnotdamaged,soastoensurethattherubberbanddoesnotshiftorturnoverduringthebuttjointprocesstoensurethetightnessofthepipesection.Atthesametime,thesteelringsleevemustbetreatedwithanti-corrosionbeforeenteringthesite. Therubberwaterstopshouldbekeptclean,freeofoil,andstoredinadarkplacetopreventaging.Duringconstruction,gluetherubberwaterstoptothegrooveoftheconcretepipemouthwithstrongglue,andstickitfirmly.Applynon-corrosivelubricatingoilbeforethepipejointstoreducefrictionandpreventthewaterstopfromturning,shiftingandbreaking.. Thecorklinerismadeofmulti-layerplywood(about1cmthick),whichisclampedbetweenthesteelcollarsofthefrontandrearpipesectionstoevenouttheinteractionforcebetweenthepipesectionsandreduceinterfacedamage.Afterthepipeistopped,thepipemustbetreatedwithinternaljoints,andtheplywoodbetweenthepipesectionsischiseledtothesamedepth(thedepthis2to3cm),andsmoothedwithasphaltelasticcaulkingpasteorcementmortar.(4)Groutingprocess: Intheprocessoflong-distance(morethan100meters)pipejacking,groutingtechnologymustbeused,andthethixotropicslurrysleeveisusedtoreducethefrictionbetweenthepipewallandthesoilduringthejackingprocess,andfillthelostsoiltoreducethesoil.Bodydeformation,settlementandwaterresistance. Thethixotropicmudismadebymixingbentoniteandwaterwithamixingratioof1:8.Thethixotropicmudisstirredandstoredintheslurrystoragetank,transportedtothegroutingholeoftheconcretepipebythegroutingmachinethroughthepipeline,andinjectedintothesoiltoformaslurrysleeve.

顶管机的施工工艺





Construction technology of pipe jacking machine

(Summary description)Accordingtothegeologicalreportandcombinedwiththecompany'sconstructionexperience,thepipejackingheaddecidedtousetheairpressurebalancegrid(waterflushing)headforconstruction.Duringthejackingprocessofthenose,theairpressurebalancesthefrontsoilpressuretostabilizethenose,reducingtheinfluenceofexternalsoilonthesurroundingground.Jackingequipmentandjackingprocess(1)Mainroof:4setsof200tons/setjacksareusedasthemainjacks,andthejackstrokeis1.4meters.Thejackpowerisprovidedbyanoilpump.Thebackendofthejackusesatrackwoodandapressuredividerringtouniformlyactontheworkingwell,andthefrontendpushesintothepressuredividerring,andthetopirontransmitsthejackingforcetothepipesection.Thepressuredividerringismadewithsufficientrigidity,anditisrelativelysmoothincontactwiththeendsurfaceofthepipewithoutdeformation.(2)Relayroom:Intheprocessoflong-distancejacking,whenjackingresistanceexceedstheallowabletotaljackingforce,andthejackingdistancecannotbereachedatonetime,therelayjackingmustbesetupinsections.Whenthejackinglengthofthispipejackingprojectexceeds100meters,itisconsideredtosetuparelayroombehindthemachineheadandadoptthethixotropicmudgroutingprocess.Therelayroomiscomposedofafrontshell,ajackandarearshell.Thefrontshellisconnectedwiththefrontconnectingpipe,therearshellisconnectedwiththerearconnectingpipe,andthefrontandrearshellsaresocket-typeconnections.Thetwoaresealedbyarubberwaterstoptopreventwater,soilandslurryoutsidethepipelinefromflowingintothepipeline. Eachrelayroomisequippedwith10jacks,eachwithajackingforceof30tons,andthejacksareevenlyarrangedalongthecircumference.Thestrokeofthejackis28cm,anditisfixedonthefronthousingwithafastenermadeofflatiron.Thesteelshellstructureisfinishedtoensurethatitdoesnotdeformduringuse.Theouterdiameteroftheshelloftherelayroomisthesameastheouterdiameterofthepipesection,whichcanreducesoildisturbance,groundsettlementandjackingresistance.Afterthepipeispushedthrough,thejacksandvariousaccessoriesareremoved,andthegapbetweentheshellandtheinnerwallofthepipesectionisfilledwithfinestoneconcrete.(3)Interface: Thepipejointinterfaceismainlycomposedofoutercasingring(steelcollar)rubberwaterstopandsoftsoilliner.Thesteelcollarcannotbedeformedduringthetransportationandliftingprocessfromtheprocessingsitetothesite,andtheinterfaceisnotdamaged,soastoensurethattherubberbanddoesnotshiftorturnoverduringthebuttjointprocesstoensurethetightnessofthepipesection.Atthesametime,thesteelringsleevemustbetreatedwithanti-corrosionbeforeenteringthesite. Therubberwaterstopshouldbekeptclean,freeofoil,andstoredinadarkplacetopreventaging.Duringconstruction,gluetherubberwaterstoptothegrooveoftheconcretepipemouthwithstrongglue,andstickitfirmly.Applynon-corrosivelubricatingoilbeforethepipejointstoreducefrictionandpreventthewaterstopfromturning,shiftingandbreaking.. Thecorklinerismadeofmulti-layerplywood(about1cmthick),whichisclampedbetweenthesteelcollarsofthefrontandrearpipesectionstoevenouttheinteractionforcebetweenthepipesectionsandreduceinterfacedamage.Afterthepipeistopped,thepipemustbetreatedwithinternaljoints,andtheplywoodbetweenthepipesectionsischiseledtothesamedepth(thedepthis2to3cm),andsmoothedwithasphaltelasticcaulkingpasteorcementmortar.(4)Groutingprocess: Intheprocessoflong-distance(morethan100meters)pipejacking,groutingtechnologymustbeused,andthethixotropicslurrysleeveisusedtoreducethefrictionbetweenthepipewallandthesoilduringthejackingprocess,andfillthelostsoiltoreducethesoil.Bodydeformation,settlementandwaterresistance. Thethixotropicmudismadebymixingbentoniteandwaterwithamixingratioof1:8.Thethixotropicmudisstirredandstoredintheslurrystoragetank,transportedtothegroutingholeoftheconcretepipebythegroutingmachinethroughthepipeline,andinjectedintothesoiltoformaslurrysleeve.

Categories:Technical Services
Author:
Origin:
Time of issue:2019-12-25 16:19
Views:

According to the geological report and combined with the company's construction experience, the pipe jacking head decided to use the air pressure balance grid (water flushing) head for construction. During the jacking process of the nose, the air pressure balances the front soil pressure to stabilize the nose, reducing the influence of external soil on the surrounding ground.

Jacking equipment and jacking process

(1) Main roof:

4 sets of 200 tons/set jacks are used as the main jacks, and the jack stroke is 1.4 meters. The jack power is provided by an oil pump. The back end of the jack uses a track wood and a pressure divider ring to uniformly act on the working well, and the front end pushes into the pressure divider ring, and the top iron transmits the jacking force to the pipe section. The pressure divider ring is made with sufficient rigidity, and it is relatively smooth in contact with the end surface of the pipe without deformation.

(2) Relay room:

In the process of long-distance jacking, when jacking resistance exceeds the allowable total jacking force, and the jacking distance cannot be reached at one time, the relay jacking must be set up in sections. When the jacking length of this pipe jacking project exceeds 100 meters, it is considered to set up a relay room behind the machine head and adopt the thixotropic mud grouting process.

The relay room is composed of a front shell, a jack and a rear shell. The front shell is connected with the front connecting pipe, the rear shell is connected with the rear connecting pipe, and the front and rear shells are socket-type connections. The two are sealed by a rubber waterstop to prevent water, soil and slurry outside the pipeline from flowing into the pipeline.

Each relay room is equipped with 10 jacks, each with a jacking force of 30 tons, and the jacks are evenly arranged along the circumference. The stroke of the jack is 28 cm, and it is fixed on the front housing with a fastener made of flat iron. The steel shell structure is finished to ensure that it does not deform during use. The outer diameter of the shell of the relay room is the same as the outer diameter of the pipe section, which can reduce soil disturbance, ground settlement and jacking resistance.

After the pipe is pushed through, the jacks and various accessories are removed, and the gap between the shell and the inner wall of the pipe section is filled with fine stone concrete.

(3) Interface:

The pipe joint interface is mainly composed of outer casing ring (steel collar) rubber waterstop and soft soil liner. The steel collar cannot be deformed during the transportation and lifting process from the processing site to the site, and the interface is not damaged, so as to ensure that the rubber band does not shift or turn over during the butt joint process to ensure the tightness of the pipe section. At the same time, the steel ring sleeve must be treated with anti-corrosion before entering the site.

The rubber waterstop should be kept clean, free of oil, and stored in a dark place to prevent aging. During construction, glue the rubber waterstop to the groove of the concrete pipe mouth with strong glue, and stick it firmly. Apply non-corrosive lubricating oil before the pipe joints to reduce friction and prevent the waterstop from turning, shifting and breaking. .

The cork liner is made of multi-layer plywood (about 1cm thick), which is clamped between the steel collars of the front and rear pipe sections to even out the interaction force between the pipe sections and reduce interface damage. After the pipe is topped, the pipe must be treated with internal joints, and the plywood between the pipe sections is chiseled to the same depth (the depth is 2 to 3 cm), and smoothed with asphalt elastic caulking paste or cement mortar.

(4) Grouting process:

In the process of long-distance (more than 100 meters) pipe jacking, grouting technology must be used, and the thixotropic slurry sleeve is used to reduce the friction between the pipe wall and the soil during the jacking process, and fill the lost soil to reduce the soil. Body deformation, settlement and water resistance.

The thixotropic mud is made by mixing bentonite and water with a mixing ratio of 1:8. The thixotropic mud is stirred and stored in the slurry storage tank, transported to the grouting hole of the concrete pipe by the grouting machine through the pipeline, and injected into the soil to form a slurry sleeve.

Previous: What are the safety requirements of the pipe jacking machine in construction?

Next: Problems encountered in pipe jacking construction and their prevention

Previous: What are the safety requirements of the pipe jacking machine in construction?

Next: Problems encountered in pipe jacking construction and their prevention

EN

中文

Project

Construction technology of pipe jacking machine

顶管机的施工工艺

Construction technology of pipe jacking machine