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In Rural Trenchless Apps
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In Rural Trenchless Apps

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In Rural Trenchless Apps In Rural Trenchless Apps Presentation Transcript

  • ALLIANCE OF INDIANA RURAL WATER Spring 2009 - Bloomington Trenchless Technology Applications for Utilities
  • Seminar Overview
    • Utility Investigation Basics/Updates
    • Sewer Rehabilitation
    • New Sewer/FM Construction
    • Water System Applications
    • Case Studies
    • Questions/Discussion
  • Utility Investigation Basics/Updates
    • Subsurface Utility Engineering
    • Utility Investigations
    The more you know about the potential utility conflicts, the better the chances of your project being successful.
  • Subsurface Utility Engineering
    • Common on Roadway Projects
    • Different Levels of Accuracy (ASTM)
    • Benefits
    • Pitfalls
  • Subsurface Utility Engineering
    • ASTM Quality Level D
      • Utility mapping only
      • Preliminary Planning/Routing
      • Use to identify congested areas
    • Limitations
      • Inaccurate utility maps
      • Missing Utilities
  • Subsurface Utility Engineering
    • ASTM Quality Level C
      • Above grade survey location
      • Correlate survey with utility mapping
      • Use in less congested utility areas
    • Limitations
      • May get conflicting data
  • Subsurface Utility Engineering
    • ASTM Quality Level B
      • Geophysical location equipment
      • Horizontal location only
      • Augment data from Level C
    • Limitations
      • Missing/broken tracer wires
      • Feedback false positives
  • Subsurface Utility Engineering
    • ASTM Quality Level A
      • Non-destructive excavation
      • Potholing (using air or water)
      • Augment data from Level B
    • Limitations
      • What happens between locates?
  • Utility Investigations
    • Sewer Television Investigation
    • Lateral Television Investigation
  • Utility Investigations
    • Sewer Television Updates
      • Sizes (laterals/main lines)
      • Types
      • Media Format (CD/DVD/HD)
      • Pan/Zoom
  • Utility Investigations Small diameter example (push approach) Small diameter example (crawler approach – 6”) Normal diameter example (crawler approach)
  • Utility Investigations Normal diameter example (crawler approach) Storm inspection camera (crawler with pan/zoom)
  • Utility Investigations
    • Problems to TV inspection
      • Offset joints
      • Breaks
      • Flooded sections
      • Grease/oil buildup on lens
    • Emerging Alternatives
      • Ultrasonic? More yet to come
  • Utility Options
  • Sewer Rehabilitation
    • Cured-In-Place Liners
    • Slip Lining Applications
    • Pipe Bursting Applications
    • Spiral-wound Applications
  • Cured In Place Liners (CIP)
    • CIP Basics
      • Usually resin-impregnated polyester liner
      • Steps
      • Disruptions to service
  • Cured In Place Liners (CIP)
  • Cured In Place Liners (CIP)
  • Cured In Place Liners (CIP)
  • Cured In Place Liners (CIP)
  • Cured In Place Liners (CIP) You can target a hard to reach spot repair You can target a hard to reach lateral repair
  • Cured In Place Liners (CIP)
    • Televise before CIP to avoid problems during construction
    • Many newer entrants into the market
    • Take care to list constraints
    • Ask for references/lineal footage/sizes
    • Alternative curing to hot water (air pressure with UV light)
  • Slip Lining Applications
    • Available for water, sanitary & storm
    • Different pipe materials available
    • Take care to list constraints
    • Know what caused the original problem
    • Ask for references/sizes/footages
    • Can be pushed or pulled into place
  • Slip Lining Applications
    • Design/Planning Issues
      • Access point locations
      • Depth/Loading issues
      • Cause of original problem?
      • Pipe materials
      • For larger pipe consider alternatives (spiral wound or shot/sprayed liner)
  • Slip Lining Applications
    • Pipe Materials
  • Slip Lining Applications
    • Other Issues
      • TV / Inspect Before
      • Annular Space
      • Seal the ends!
      • Pipe materials
  • Pipe Bursting Applications
    • Can put in the same size or larger
    • Can burst any kind of pipe (DI/CI/RCP etc)
    • Can use HDPE/PVC/DIP
    • Different bursting approaches
    • TV Inspect for lateral locations before beginning
    • Lateral reconnections
  • Pipe Bursting Applications
  • Pipe Bursting Approaches
    • Static bursting (hydraulically pulled wedge)
    • Dynamic bursting (usually pneumatic)
  • Pipe Bursting Applications Static Pipe Bursting Approach
  • Pipe Bursting Applications Dynamic Pipe Bursting
  • Pipe Bursting Applications Lateral Pipe Bursting
  • Spiral Wound Applications
    • Usually a PVC/cement grout composite
    • Used in larger pipe diameters but also can be used on smaller sewers
  • Spiral Wound Applications
    • Trunk Sewers
  • Other Approaches
  • New Sewer Construction
    • Micro-tunneling
    • Horizontal Directional Drilling (HDD)
  • New Sewer Construction Micro-Tunneling (Pipe Jacking)
  • New Sewer Construction Impact Moling Rotary Moling
  • New Sewer/FM Construction HDD Overview Figure
  • New Sewer/FM Construction HDD Machines/Rigs
  • New Sewer Construction
  • New Sewer Construction
  • New Sewer Construction
  • New Sewer Construction
  • HDD Considerations
    • You can pull back DIP/PVC/HDPE
    • Must watch ambient temperature for HDPE pipe pulls
    • Understand the limits of drill steel
    • The jury is still out on fusible PVC
    • DIP joints are usually ball/socket
    • New HDPE material standards are in place – still reviewing the impacts
    • Plan for expansion/contraction interfaces
  • HDD Construction Pointers
    • Make sure all utilities are directly located (horizontal/vertical) by contractor prior to drilling
    • Understand what parts/equipment you will need to tap or repair
    • Make sure you get drill logs for each installation
  • Water System Applications
    • Rehabilitation/relining with cement
    • Slip lining existing watermain
    • HDD alternative for new construction
    • HDD using HDPE or PVC
    • The jury is still out on fusible PVC
  • Water System Rehabilitation
    • Understand why existing watermains have failed
    • You may have a corrosion control issue
    • Must be able to run temporary water or make appropriate arrangements
    • Think about the spare parts and special equipment for watermain that is not C-900, CI, or DIP
  • Water System Sliplining HDPE Slip Line Folding Process Alternative process involves pressure compression with direct pull into existing WM
  • Water System Sliplining Steel WM (Before) After Cleaning
  • Water System Slip Lining During Install Fittings
  • Water System HDD Issues
    • Understand why existing watermains have failed
    • You may have a corrosion control issue
    • You may end up with deeper sections
    • Think about the spare parts and special equipment for watermain that is not C-900, CI, or DIP
    • You may need to plan for hydrant extensions
  • Case Studies Putting ideas into action
  • Case Studies
    • Lansing Michigan
      • 7,600 lft - 72” wide x 42” high interceptor
      • Combined sewer (had to line in dry weather)
      • Local auto plant (had to keep in service)
      • Only had three week window
      • In-Liner and Insituform (open bid)
  • Case Studies
    • Sanborn Michigan
      • 1000 lft – 12” watermain replacement
      • Bid alternates (bridge mounted/HDD with HDPE)
      • First HDPE water line permitted in MI (1993)
      • LUST site/contaminated groundwater
      • Expansion joints (connection to DIP)
  • Case Studies
    • Windfall Indiana
      • 36,000 lft –6” & 8” watermain replacement
      • Bid alternates (Open Cut/HDD with HDPE)
      • SR 213 – INDOT required HDD
      • Coordinated work with new tower/WTP
      • HDPE Fittings/Normal Valves/Hydrants
      • HDD saved the Town $988,000
  • Case Studies
  • Case Studies
  • Case Studies
  • Case Studies
  • Case Studies
  • Case Studies
    • Indianapolis, IN (Post Rawles STEP)
      • Post Road is a major arterial road
      • Existing sewer (east of road)
      • 20 homes to connect (west of road)
      • HDD with 2% slope for 15 connections
      • Avoided rebuilding 4 blocks of major roadway
  • Conclusions & Thoughts
    • Understand your existing system
    • Know what other utilities exist
    • Understand the limits of trenchless alternatives
    • Look to effectively use bid alternates
    • Educate your council/elected official
  • Conclusions