D-Metal Pipe.ppt

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Published on November 26, 2008

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PIPE CONSTRUCTIONOhio Department of Transportation : PIPE CONSTRUCTIONOhio Department of Transportation Corrugated Metal Pipe Installation Brian Flint Regional Engineer CONTECH CONSTRUCTION PRODUCTS, INC. What is There to Talk About ? : What is There to Talk About ? Materials Corrugations & Gauges Coatings Structural Design Foundation Considerations Backfill Procedures Proper Cover Requirements CSP Joint Options Slide 3: CONTECH Construction Products, Inc. 80 years of Metal Product Innovation Corrugated Metal Pipe Design Criteria : Corrugated Metal Pipe Design Criteria Hydraulics Can You Achieve the Flow Requirements Structural Capacity Can You Handle the Loading Condition Durability Can You Last 75 Years Prove It ! Economy Structural Design : Structural Design 1. Determine the loads on the pipe. 2. Calculate ring compression. 3. Perform basic strength and stiffness checks. a) wall strength b) seam strength c) handling stiffness 4. Ensure minimum cover. 5. Check and account for corner pressures on multiple radius pipes. (i.e. pipe arches) Physical Strength : Physical Strength Structural Design Installation Stiffness Importance of a Quality Backfill Deflection: Modified Iowa Formula Deflection = Load Pipe Stiffness + Soil Stiffness Soil Stiffness Accounts for 90% of Total Stiffness Approved ODOT Sizes : Approved ODOT Sizes CONTECH size range from 6 “ to 144 “. ODOT Sizes: 707.01 1/4” or 1/2” deep 6” - 84” 707.02 1” deep 36” - 120” 707.12 Spiral Rib 18” - 78” ALUMINIZED Steel Type 2 Only 707.08 and 707.09 Fiber Bonded CSP No Longer Available ! Durability : Durability How Long Should it Last ? 50 years or 75 years What is the Design Service Life Required ? ODOT has Durability Charts for Metal Pipe L & D Manual: 1002-5 and 1002-6 ALT2 provides a minimum of 75 years for 16ga when 5<pH<9 and R>1500. As the gage is increased, the service life increases. Slide 9: MANUFACTURER TYPE OF COATING GAUGE HEAT NUMBER DATE OF MANUFACTURE SPECIFICATIONS Installation Overview : Unloading and Handling Basic Installation Bedding Backfill ULTRA FLO (Spiral Rib) Connections/Bands/Accessories Installation Overview Unloading and Handling : Unloading and Handling Easily shipped in “nested” bundles (fewer trucks) Easy to handle and unload: Light weight ( light equipment ) Lifting Lugs for Large Diameter used with slings and hooks Slings or fork lift for smaller Diameter DO NOT Roll off truck Long Joints ( 20 ft - 40 ft ) Small outside Diameter Proper Bedding : Proper Bedding Uniform Support Lateral Longitudinal Well graded granular material Free of frozen soil, sod, and large rocks Upper few inches should be relatively loose to allow corrugations to seat in bedding Proper Foundation : Proper Foundation Soft Foundations : Soft Foundations Excavate Soft Soil and Replace with Highly compacted granular material Minimum Permissible Spacing For Multiple Installations : Minimum Permissible Spacing For Multiple Installations Backfill : Backfill Satisfactory material: Well graded granular, w/ little to no plasticity Clean/dense/stable/drainable soil Proper placement (6”- 8” lifts on each side) Proper Compaction (90% Std. Density)AASHTO T99 Maintain minimum Height of Cover Installation conditions: Embankment or Trench Proper Backfill - Embankment : Proper Backfill - Embankment 8” Lifts Thoroughly compact fill in 8” max loose lifts. Keep fill at same level on both sides of pipe. Diameter Lifts Should extend at least 1 pipe diameter on each side Proper Backfill - Trench : Proper Backfill - Trench 8” Lifts Outside diameter plus sufficient room for compaction equipment Diameter Tamping Under the Haunches : Tamping Under the Haunches Care must be taken to assure that voids and soft spots are not left under the haunches of pipe Proper Backfill: Pipe Arches : Proper Backfill: Pipe Arches Heavy Construction Loads : Heavy Construction Loads Compaction Techniques : Compaction Techniques Walk Behind Compactor Sheep Foot or Rubber Tire Roller Vibrating Rollers Flooding with Water approved ODOT methodology Bands and Accessories : Bands and Accessories HUGGER® Band Bolt Bar and Strap Connector O Ring Gaskets Flat Band Flat Gasket STAB Joint Fluted Gasket Dimple Band Your Greatest Strength Can be Your Greatest Weakness : Easy to assemble Positive Joint, w/ pull apart resistance Soil tight Can be done with 1 or 2 people Small amount of tools Felton Band Puller Mallet Open end or Deep socket wrench Impact Equipment Your Greatest Strength Can be Your Greatest Weakness Band Fasteners : Band Fasteners Scafco Angle Used for smaller Diameter Pipe Bar, Bolt and Strap Single Double Rod and Lug (Levee Band Applications) HUGGER Band : HUGGER Band H-12 HUGGER BAND Connection Detail Single Bolt, Bar, & Strap HUGGER Bands : HUGGER Bands Bands are normally furnished as follows: 12” thru 48” 1 piece 54” thru 96” 2 piece 102” thru 144” 3 piece Band fasteners are attached w/ spot welds Rerolled ends are 2-2/3” x 1/2” corrugation Slide 28: Longer Lengths = Fewer Joints In Line Fittings: Improved Hydraulics : In Line Fittings: Improved Hydraulics Slide 30: O RING Gaskets: Soil Tight Joints Slide 31: HUGGER Band Band Puller: Helps You Get Started : Band Puller: Helps You Get Started Fabricated Fittings : Fabricated Fittings Full line of fittings including elbows, tees, wyes, risers, bulkheads, reducers, etc. Conclusions : Conclusions Handle it Properly The Right Foundation: The Key to a Quality Life Quality Backfill and Placement: Important for all Systems Roadway Embankment is Final Objective HUGGER Bands Applied Properly Stab Joints are Coming

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