2007 0709 Ca

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2007 0709 Ca

  1. 1. Technical Archives PROJECT LOG DATE: 9 July 2007 CLIENT: The Trenchless Company, Sacramento, CA JOB LOCATION: Agilent Technologies, Santa Clara, CA JOB: 200' sewer section replacement under parking lot divider planted with mature redwood trees, replacing 8quot; VCP line with 8quot; SDR7 PE, pulling upstream SPECIAL CONDITIONS: Product testing new 8quot; Footage/TRIC Unified Force impactor head TOOLS: WC22 hydraulic ram, Case 580 back hoe 2007_0709CA.pdf
  2. 2. 530 Stevens Creek Boulevard, Santa Clara, CA 2007_0709CA.pdf 2
  3. 3. Sewer runs under lot/lane divider planted with mature trees. 2007_0709CA.pdf 3
  4. 4. Fusion and landing area on lot side. 2007_0709CA.pdf
  5. 5. View from entry end (downstream excavation). 2007_0709CA.pdf 5
  6. 6. Entry pit is 0 to 2 feet deep with shoring. Existing clay pipe is bedded in sand. Sewer was lined from this point to lower manhole 20-30 feet downstream in order to avoid excavation or bursting around large water main crossing sewer path. 2007_0709CA.pdf
  7. 7. Using jetter to retrieve and pull back 220’ of air hose. 2007_0709CA.pdf 7
  8. 8. Attaching air hose to jetter hose. 2007_0709CA.pdf 8
  9. 9. Feeding back air hose from head end. 2007_0709CA.pdf 9
  10. 10. Air hose arrives at tail end. 2007_0709CA.pdf 0
  11. 11. Impactor attaches to hose and then slides into sealed bursting head. 2007_0709CA.pdf
  12. 12. Drilling and securing pipe to head with set screws. 2007_0709CA.pdf 2
  13. 13. Attached to standard clevis and ready to test. 2007_0709CA.pdf 3
  14. 14. WC22 ram set on pulley base in exit pit, ready to insert cable. 2007_0709CA.pdf
  15. 15. Puller is removed when cable clevis approaches pulley wheel, then cable is detached and replaced with a chain to hook to backhoe bucket. 2007_0709CA.pdf 5
  16. 16. Shoring/excavation is perpendicular to pipeline, so space is limited for bucket to pull with hammer assist. 2007_0709CA.pdf
  17. 17. Directing force in line with pipe in deep, confined space is difficult. 2007_0709CA.pdf 7
  18. 18. Pulling another two feet or so, with impactor. 2007_0709CA.pdf 8
  19. 19. When head is pulled as far as space allows, backhoe is moved to entry pit for attempted push. 2007_0709CA.pdf 9
  20. 20. Cutting pipe in entry pit, being careful not to cut air hose. 2007_0709CA.pdf 20
  21. 21. Pushing with hammer makes little or no progress. 2007_0709CA.pdf 2
  22. 22. Head assembly is moved to compressor to attempt removal of impactor. 2007_0709CA.pdf 22
  23. 23. Hooking impactor up to air supply after setting hammer in reverse. 2007_0709CA.pdf 23
  24. 24. Impactor is firmly wedged inside head. 2007_0709CA.pdf 2
  25. 25. Still no separation. Applying anti-seize on impactor shaft prior to use might facilitate removal after job, or perhaps standing the unit on its nose against a solid surface would help the hammer release itself. Otherwise, modification of mating surface inside mole may be in order. 2007_0709CA.pdf 25

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