Presentation on theme: "PIPE CONSTRUCTION Ohio Department of Transportation"— Presentation transcript:
1PIPE CONSTRUCTION Ohio Department of Transportation Corrugated Metal Pipe InstallationBrian FlintRegional EngineerCONTECH CONSTRUCTION PRODUCTS, INC.
2What is There to Talk About ? MaterialsCorrugations & GaugesCoatingsStructural DesignFoundation ConsiderationsBackfill ProceduresProper Cover RequirementsCSP Joint Options
3CONTECH Construction Products, Inc. 80 years of Metal Product Innovation
4Corrugated Metal Pipe Design Criteria HydraulicsCan You Achieve the Flow RequirementsStructural CapacityCan You Handle the Loading ConditionDurabilityCan You Last 75 YearsProve It !Economy
5Structural Design 1. Determine the loads on the pipe. 2. Calculate ring compression.3. Perform basic strength and stiffness checks.a) wall strengthb) seam strengthc) handling stiffness4. Ensure minimum cover.5. Check and account for corner pressureson multiple radius pipes. (i.e. pipe arches)
6Physical Strength Structural Design Installation Stiffness Importance of a Quality BackfillDeflection: Modified Iowa FormulaDeflection = LoadPipe Stiffness + Soil StiffnessSoil Stiffness Accounts for 90% of Total Stiffness
7Approved ODOT Sizes CONTECH size range from 6 “ to 144 “. ODOT Sizes: /4” or 1/2” deep 6” ”” deep 36” ”Spiral Rib 18” ”ALUMINIZED Steel Type 2 OnlyandFiber Bonded CSP No Longer Available !
8Durability How Long Should it Last ? 50 years or yearsWhat is the Design Service Life Required ?ODOT has Durability Charts for Metal PipeL & D Manual: andALT2 provides a minimum of 75 years for 16ga when 5<pH<9 and R> As the gage is increased, the service life increases.
9MANUFACTURERTYPE OF COATINGGAUGEHEAT NUMBERDATE OF MANUFACTURESPECIFICATIONS
10Installation Overview Unloading and HandlingBasic InstallationBeddingBackfillULTRA FLO (Spiral Rib)Connections/Bands/Accessories
11Unloading and Handling Easily shipped in “nested” bundles (fewer trucks)Easy to handle and unload:Light weight ( light equipment )Lifting Lugs for Large Diameterused with slings and hooksSlings or fork lift for smaller DiameterDO NOT Roll off truckLong Joints ( 20 ft - 40 ft )Small outside Diameter
12Proper Bedding Uniform Support Lateral Longitudinal Well graded granular materialFree of frozen soil, sod, and large rocksUpper few inches should be relatively loose to allow corrugations to seat in bedding
13Proper Foundation Uneven Foundation Uniform Foundation Pipe Pipe Soft FirmSoftPipeUneven FoundationPipeUniform Foundation
14Soft Foundations Soft Excavate Soft Soil and Replace with Highly compactedgranular materialSoft In-Situ SoilWDSoftShape BottomFor Pipe ArchFor pipe-arch, excavate under pipe and replace withgranular material only as deep as is necessary toobtain stable bed to install pipe
15Minimum Permissible Spacing For Multiple Installations ArchesPipe ArchesSpanPipeDiameterUp to 36”……..12”36” to 108”……1/3 span108” to 189”…..36”Diam.Up to 24”…..12”24” to 72”….1/2 diam.72” and over..36”
16Backfill Satisfactory material: Well graded granular, w/ little to no plasticityClean/dense/stable/drainable soilProper placement (6”- 8” lifts on each side)Proper Compaction (90% Std. Density)AASHTO T99Maintain minimum Height of CoverInstallation conditions:Embankment or Trench
17Proper Backfill - Embankment Diameter8” LiftsThoroughly compact fill in 8” max loose lifts. Keep fill at same level on both sides of pipe.Lifts Should extend at least 1 pipe diameter on each side
19Tamping Under the Haunches SpanDiameterTamperedFillCare must be taken to assure that voids and soft spotsare not left under the haunches of pipe
20Proper Backfill: Pipe Arches SpanCompacted Layersin 8” LiftsCompacted to max density belowand beside the haunchesStable
21Heavy Construction Loads Finished GradeHeight of CoverTemporary Cover forConstruction LoadsPipe
22Compaction Techniques Walk Behind CompactorSheep Foot or Rubber Tire RollerVibrating RollersFlooding with Waterapproved ODOT methodology
23Bands and Accessories HUGGER® Band Bolt Bar and Strap Connector O Ring GasketsFlat BandFlat GasketSTAB JointFluted GasketDimple Band
24Your Greatest Strength Can be Your Greatest Weakness Easy to assemblePositive Joint, w/ pull apart resistanceSoil tightCan be done with 1 or 2 peopleSmall amount of toolsFelton Band PullerMalletOpen end or Deep socket wrenchImpact Equipment
25Band Fasteners Scafco Angle Bar, Bolt and Strap Used for smaller Diameter PipeBar, Bolt and StrapSingleDoubleRod and Lug (Levee Band Applications)
26HUGGER Band 12-1/8” 12-1/8” Connection Detail Single 10-1/4”H-12HUGGERBANDH-12HUGGERBAND12-1/8”10-1/4”O-RingGasketGasketedSectionConnection DetailSingleBolt, Bar, & Strap
27HUGGER Bands Bands are normally furnished as follows: 12” thru 48” 1 piece54” thru 96” 2 piece102” thru 144” 3 pieceBand fasteners are attached w/ spot weldsRerolled ends are 2-2/3” x 1/2” corrugation
33Fabricated FittingsFull line of fittings including elbows, tees, wyes, risers, bulkheads, reducers, etc.
34Conclusions Handle it Properly The Right Foundation: The Key to a Quality LifeQuality Backfill and Placement:Important for all SystemsRoadway Embankment is Final ObjectiveHUGGER BandsApplied ProperlyStab Joints are Coming