BIỆN PHÁP THI CÔNG ỐNG CẤP THOÁT NƯỚC

MOS, Biện pháp thi công đường ống, Cách thi công đường ống, áp dụng cho các Tòa nhà cao tầng, văn phòng cao ốc, trung tâm thương mại, nhà máy. Tài liệu dùng ngôn ngữ tiếng anh, phù hợp cho các Kỹ sư, Ban quản lý làm việc trong môi trường nước ngoài

HCMC Metro Cp-2 Project

Rev Date: _2015Rev.No : 0

GS Neotek Vietnam

TABLEOF CONTENTS Pageno.

1 Aim 2

2 Scopeof Works 2

3 QualityControl 2

3.1 Purpose/Scope 2

3.2 Referencesand Standard 2

3.3 ProcessFlowChartfortheWorkPlanProcedure 3

4 Procedure 4

5 MaterialControl 4

6 Methodology 5

6.1 PPR PipesandFittingsInstallation 5

6.2 uPVCPipesandFittingsInstallation 16

6.3 HDPE PipesandFittingsInstallation 23

6.4 UndergroundPipesInstallation 24

7 MachineryandTools 25

7.1 Machineryandtoolsforconstruction 25

7.2 Machineryandtoolsfortesting 25

8 TestMethodandTestPlan,TestRecordForms,InspectionForms 26

8.1 TestMethod 26

8.2 InspectionandTestPlan 27

9 SafetyPlan 27

10 Appendix 28

HCMC Metro Cp-2 Project

Rev Date: _2015Rev.No : 0

Engineer's/Consultant’sComments Approved

Materialsprocurement &delivery to site.

Rejected Inspection

Rejected

Approved

1 Hydraulic Test–Cold&HotWater Piping

2 Water Leak Test–Soil,Waste, Vent &Drainagepipe Inspection

1 Installationofequipment

2 F inalconnectiontoequipme

nt, valves andaccessories

Approved

HCMC Metro Cp-2 Project

Rev Date: _2015Rev.No : 0

5.2 SCOPE

Thisprocedureisapplicabletoreceiving,handling,storage, maintenanceandinspectionof itemsreceivedbyMain-confortheconstructionof HCM Metro CP-2 – Line 1 Project

5.3 RESPONSIBILITY

a) Main-conengineershallberesponsiblefortheimplementation ofreceivinginspectionand notifyingOwner’sProjectEngineer(1 dayin advance)

materialdeliveryITPformsforthematerialsw/c Main-conpurchasedinthe localmarket;and foroverseas,thearrivalofmaterialshallbeadvisedtoClient/Project Engineeronthe

shipmentdateandETAinHCM.Main-conEngineershallnotifytheClient/Project Engineer uponarrival inHCMoneday inadvance forreceivinginspectiontosite The

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ReceivinginspectionshallbeperformedbytheMain-conengineerandClient/ProjectEngineer formaterialandequipmentreceived

HCMC Metro Cp-2 Project

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- JointhemimmediatelyuntilthemarkedweldingdepthiscoveredbythePP-R beadfrom thefitting

- Beforestartingthefusion,checkifthealuminum-PP-compositelayerhasbeen completelyremove

- All used devices and tools must have reached the necessary operating temperatureof 260deg.C

- Suitablemeasuringinstrumenthavetomeasureatemperatureofupto350deg

C

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HCMC Metro Cp-2 Project

Rev Date: _2015Rev.No : 0

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- Fusingtheweld-in saddlewiththepipetheoutersurface andthepipeinner wallconnectionreacheshigheststability

- Theweldingdevice/saddle weldingtoolmusthavereachedtherequired operatingtemperatureof 260deg.C

- TheWeldingsurfaceshavetobecleananddry

- Inserttheheating toolontheconcave sideoftheweld-in saddletoolintothe holedrilledin thepipe wall untilthetool iscompletelyin contactwith theouter wallofthepipe.Nexttheweld-in saddletoolisinserted intotheheating

sleeveuntilthesaddle surface isupagainst theconvexsideofthewelding tool.Theheatingtimeof theelementsis generally30 sec

- Inserttheweld-insaddlein to theheateddrilledhole.Pressedandwaitfor15 sec.Waitfor10minutestocoolbeforeexposedtofullloading

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Page : 11 of _

TITLE : Method Statement for Plumbing & Sanitary

Piping works

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4) B utt W e l d i ng

Pipesandfittingsarefused,asexplainedbelowbybuttwelding(pipedimension 160,200,and250mm)

- Cutpipeintorequiredlength

- Plasticpipesarealignedandfixedbymeansof theclampingelements

- Pushthepipesontotheheatingplacewithadefinedadjustingpressure

- Whenheatingtimehasexpired,dividethemachineslide,removeheatingelement quicklyandjointthepipes(byputtingbothpartsof theslidetogether)

- Weldedconnectioncanbe unclampedandweldingprocessis finished

HCMC Metro Cp-2 Project

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HCMC Metro Cp-2 Project

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Note:Seeshop drawing

detailsfor variouspipe outlet heightsasper san.fixtures supplierrecommendation.

HCMC Metro Cp-2 Project

Rev Date: _2015Rev.No : 0

- Markthemeasuredlengthonthepipe bypermanentmarkerpen

CutthepipeusingapowersaworaPVCcutter.Besureto cutthepipe squarely

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- Chamferthe

cornersandremoveallburrsbyreamer,fileorsandpaper,cleanawaydust,dirtandoils withacleanrugbeforeapplyingadhesive

HCMC Metro Cp-2 Project

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Page : 19 of _

TITLE : Method Statement for Plumbing & Sanitary

Piping works

GS Neotek Vietnam

- I

mmediatelyinsertpipeintofittingsocket,givingthepipeaonequarterturnandmakingsureitgoesallthewaytothesocketbottom

-Holdthejointtogetheruntilatightsetis attained

- Standardcontroltimesis30secondsfordiametersof50mmorless,take

60secondsfordiameterofmorethan50mm

HCMC Metro Cp-2 Project

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to installation.

- Cutpipeintorequiredlength.

- Plasticpipesarealignedandfixedbymeansof theclampingelements

- Pushthepipesontotheheatingplacewithadefinedadjustingpressure

- Whenheatingtimehasexpired,dividethemachineslide,removeheatingelement quicklyandjointthepipes(byputtingbothpartsof theslidetogether)

- Weldedconnectioncanbe unclampedandweldingprocessis finished

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Page : 25 of _

TITLE : Method Statement for Plumbing & Sanitary

Piping works

The parts to be welded are fixed and aligned respectively

Positioning of heating element

Divide the machine slide, remove heating element

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Join the pipe, cool down under pressure

6.4 Underground pipe installation (Drainage piping):

- Before commencement of any installation work, ensure that materials to be used had been inspected

- Excavation shall be carried out, as may deemed to be necessary for the construction of the work and dewatering pump may be required which subject to site condition

- Prepare setting out of main / branch drains based on approved shop drawings

- Excavate the required trench for the main / branch drain as per setting out

- Excavation for trench shall be of straight line and provide gradient for the pipes and beds

- Shoring shall be provided for unstable earth condition, (if necessary)

- Check the excavated depth progressively until the required invert level is achieved

- Treat the excavated layout trench with sand layer is compacted

- Proceed to pipe laying as per proposed invert level Level instrument is use to check the invert level

- The socket end of pipe is to be placed facing the upward stream of the gradient and shall be secured with rebar and engineering brick

- Ensure both ends of pipe are provided with 200mm clearance, for the end pipe entering to the Sump/

MH rebar internal wall and before the form work close-up to Sump / MH

- Upon curing of the concrete haunch pipe, remove all formworks and any unwanted materials out of the trench including any strutting supports Trench is then backfilled with selected excavated sand The sandlayer is compacted up to 200 mm and the soil layer is backfilled & compacted progressively until to the finish level

HCMC Metro Cp-2 Project

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halftimesthemaximumpressurewhicheveris greater.

(Seespecs.Section07.4)

Thepressuredropshall notdropmorethan5%

Soil,Waste,Ventand

Drainagepipe Waterfillingtest(bywater)(Fillwithwatertotopofhighest

partof installarea,24 hours)

Toleranceof 1~2mm c

hangeofwaterlevel

L eaka g e t est ( b y w a t e r )

- Two(2)typesof waterpumpsshallbe usedfortesting,

- Portablemotorizedpumpandmanualhandpump

- Two(2) waterpressuregaugesshallbeinstalledatthetest pointof thepipefor

monitoringthetestpressurein thepipe.Rangeof pressuregaugeshallbefollowas,

a) 0bar ~25bar: WaterSupplySystem

b) 0bar ~15bar: HotWaterSupplysystem,PlumbingandSanitaryFixtures,Water

Thetestdurationisatleast( 24)hou rs , thepressuredropshallnotdropmorethan 5%

• Afterapproval oftheleakagetest,release thetestpipepressureto0baranddrain

outthewaterinthepipe

HCMC Metro Cp-2 Project

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- Oncethestackisfilledwithwatertofull and kept for 15 min.,aninspectorshall

makeavisualinspection of thesectionbeingtestedto checkforleaks

- Recordtheintervalbetweenpipe edge andwatersurfaceandwaterlevelshallbe marked onpipesurface.24hoursorlongerlater,checkintervalchangebyvisualcheck The

changewaterlevelshallnotbe approved

- Oncethesystemhasbeensuccessfullytested,itshouldbedrainedandthenextsection shouldbe preparedfortest

Main-conshallcarryoutitsworksinthesafestmannerpossible Jobhazardanalyses shall

beprepared andapproved priortosetting outwithspecifictaskstoperform The healthofthe

workersshallbe aparamountconcernof theCompany

 Safetyshallbestrictlyobserved.Allsafetyequipmentsuchasclothes,shoes,helmet,

gloves,safetybeltwillbeprovidedandregularlycheckduringconstruction

 Main-conEngineershallinspectallSub-contractor’stoolspriorto be useon site

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 Equipmentintendedforuseshallhavebeeninspectedandtagged“SafeforUse”

SafetyonInstallationofPipeonHighElevation

 Installedhangersandsupportsshouldbeinspectedfirstandbe approvedbeforeinstallation of pipe

 Priortoinstallationofpipeonhighelevation, anappropriate liftinggearshouldbeusefor liftingpipe Acompetentexaminershoulddeterminetheappropriateliftinggearforsuch weightof

pipebeforeliftingof pipeshouldproceed

10 Appendix