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In Rural Trenchless Apps


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In Rural Trenchless Apps

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