07 poletto ppt 2 fundaciones especiales
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fundaciones especialesTRANSCRIPT
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RAYMOND J. POLETTO, PEMUESER RUTLEDGE CONSULTING ENGINEERSWWW.MR C E . C OM
DFI 2012 SHORT COURSE & SPECIALTY SEMINAR:
DESIGN & CONSTRUCTABILITY OFDIAPHRAGMWALLS:QUALITY ASSURANCE &QUALITY CONTROL
QUALITY ASSURANCE &QUALITY CONTROL: GOALS
1. Limit Defects In PanelConstruction
2. Good CooperationNeeded By Owner’sRepresentative, DesignEngineer, Specialty AndGeneral Contractors
3. Implement Design OrWork Changes If FieldConditions Or ConstructionMethods Show Problems
4. Avoid Litigation ByProper Communication
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QUALITY ASSURANCE & QUALITYCONTROL: WORK PROCESS
1. Set Out ConstructionProcedures Which AreReasonable Expectations OfAchieving The Slurry WallFunction. (Lateral Or VerticalStructural Element And To LimitThe Flow Of Groundwater)
2. Contractor Provides TheQuality Control Of The SlurryWall Construction Per ContractRequirements Or IndustryStandards
3. Inspections Provide TheQuality Assurance Of TheConstructed Wall And Provide ARecord Of ConstructionProcedures
4. Field Conditions and WorkProcedures Should Be CarefullyReviewed By ExperiencedGeotechnical & StructuralPersonnel Relating Causes AndEffects As Closely As Possible
1. Panel Types andConstruction Methods(Temporary or Permanent Walls)
2. Expect LimitedSeepage of WatertightSystems & PossibleNeed for InteriorDrainage
3. ExpectIrregularities in WallFace
4. Inspection byContractor and byOwner’s Team
5. AddressConstruction Defects& Repairs
6. Review Good or PoorPractices by ConstructionTeam
UNDERSTANDING PROJECTEXPECTATIONS & REQUIREMENTS
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Panel Types
IndividualLoad BearingElements
SegmentedConcretePanels
ReinforcedConcretePanels
Soldier Beam& ConcreteWalls (SPTC)
Precast WallsPost
TensionedWalls
PANEL CONSTRUCTIONMETHODS
1. Round PipeJoints
2. Steel BeamJoint (Soldier PileTremie Concrete)
3. Key Joint 4. Key Joint withWaterstop
FORMEDWALL JOINTS
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PANEL JOINTS
SEMICIRCULARPANEL JOINTFORMED BYEND STOP PIPE
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SPECIAL ENDSTOP DEVICEWITH PVCWATERSTOPFOR KEY INPANEL JOINT
REINFORCED CONCRETE PANELSEQUENCE
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PANELMETHODWITH HYDROMILL
OVERCUT INPRIMARYPANEL BYHYDROMILL
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EXPECTWALL SEEPAGE &MOISTURE CONTROL
Watertight WallSystems AllowMinor WallSeepage
Some Wall PanelsMay Have Seepage
Tieback Sleeves &Anchor Heads MayLeak
Seepage &Moisture ControlMethods AreNeeded
IDEALWATER TIGHTNESS OF JOINTS &FACE OF PANELS
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TYPICALWALL SEEPAGEBEFORE FINAL SEALING
WALL LEAKS BEFORE GROUTING
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SEALING OFTIEBACKSLEEVES &HEADS
TREATEDWALLWITH INTERIORDRAINAGECOLLECTIONSYSTEM
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Remove Bentoniteor Cement Fill in
Panel Joint
Fill Wall Voids inPanel Concrete &Cut Floor Slab Keys
Remove Overpoursof Panel Concrete
Trim Concrete atTop of Wall
IRREGULARITIES INWALL FACE
REMOVEBENTONITEFILL IN PANELJOINT
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FILL WALL VOIDS IN PANELSCUT FLOOR SLAB KEYS
REMOVECONCRETEOVERPOURS INPANELS
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TRIMCONCRETE ATTOP OFWALL
Proper Inspection by a qualified geotechnical engineer and/orinspector familiar and experienced with installation and testingslurry fluids, concrete and structural steel is essential to thesuccessive completion of this work because to a large extent
problems occur with inaction or inability to understand constructionprocedures, site geological conditions and test results. The
evaluations of these elements are critical in achieving quality work.
Proper Inspection by a qualified geotechnical engineer and/orinspector familiar and experienced with installation and testingslurry fluids, concrete and structural steel is essential to thesuccessive completion of this work because to a large extent
problems occur with inaction or inability to understand constructionprocedures, site geological conditions and test results. The
evaluations of these elements are critical in achieving quality work.
The inspector needs to review the contractor’s work includingsampling of all materials and carefully monitoring and collecting the
required test information for proper quality assurance. Manyprojects have experienced severe problems; cost over runs and
delays because the project owners and construction managementteam relied on untrained, inexperienced and non motivated
inspectors.
The inspector needs to review the contractor’s work includingsampling of all materials and carefully monitoring and collecting the
required test information for proper quality assurance. Manyprojects have experienced severe problems; cost over runs and
delays because the project owners and construction managementteam relied on untrained, inexperienced and non motivated
inspectors.
INSPECTORS ROLE IN CHECKINGWORKQUALITY &MATERIALS
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• Verification Drilling In Key Stratum (Sometimes Need InRock Or Dense Alluvial and Glacial Deposits)
• Verticality Checks• Bentonite Testing• Concrete Testing• End Bearing: Check for Loose Soil or Rock• Site Monitoring & Instrumentation• Upon Wall Exposure: Visual Checks Of Wall Seepage,Concrete Fascia, Panel Joints And Keys, Sealing Leaks andWall Repairs
• “Industry Practice Standards and DFI Practice GuidelinesFor Structural Wall”
QUALITY ASSURANCE CHECKS
WALLTOLERANCES
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CONTROL PANEL EXCAVATION BYCHECKING BUCKET DEVIATIONWITHINGUIDEWALLS
TRENCHSUPPORT BYBENTONITESLURRY INVARIOUSSOILS
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SLURRY FLUIDINSPECTIONREPORT FORM
MAKE SLURRY FLUID CHECKS BEFOREPLACEMENT OF CONCRETE
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PANEL CAGE FABRICATION
INSTALLATIONOF TYPICALREINFORCINGCAGE
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SLURRYWALLPANEL REPORTFORM
CHECKS DURING THEPLACEMENT OF CONCRETE
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POURING TREMIE CONCRETEINTO PANEL
TREMIE CONCRETE REPORT FORM
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TROUBLE SHOOTING &PROBLEM SOLVING:FIELD RECORDS CAN REVEALPOTENTIAL CORRECTIVE WORKOR DEFECTS
TREMIECONCRETEPOUR CHART
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MONITORWALL CONDITIONS DURINGEXCAVATION STAGES
MONITOR THEWALL MOVEMENTS &CRACKS IN PAVEMENTSWHILEWAITING FOR LEAK REPAIRS
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OBSERVE CONSTRUCTION DEFECTS,REPAIRS & CORRECTIVEWORK
CONSEQUENCES OF POORQUALITY CONTROL ORINSPECTION
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STOPPINGWALL OR TIEBACKANCHOR LEAKS IS VERY IMPORTANT
WALL LEAKS UNATTENDEDWILL IN TIME BE A PROBLEM
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GoodConstructionInspection &Quality ControlMeasures Assure
BetterConstruction
TimelyCommunicationBetween Parties
Attend to PanelDefects in Timely
Manner
SUMMARY OF GOODQA/QC PRACTICES
RAYMOND J. POLETTO, PEMUESER RUTLEDGE CONSULTING ENGINEERSWWW.MR C E . C OM
THANK YOU ! QUESTIONS WILL NOW BE TAKEN.