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Integrating Silva Cells and Utilities

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“What about utilities?”

This is probably the most frequently asked question DeepRoot's technical manager hears on projects where the Silva Cell is being used. And it's understandable! Utilities are an extremely important consideration.

With the experience of 500 installations, we can comfortably say that we’ve seen – and have a solution – for pretty much everything out there. Integration with utilities is by no means a barrier to using the Silva Cell.

This presentation covers:

Integrating Silva Cells and utilities
• Running utilities through the Silva Cells
• Options for when utilities cannot be run through the frames

Planning for the Future
• Utility corridors
• Future capacity
• Utility locations
• Locating equipment
• One-call network
• Directional boring

Repairs and Maintenance
• Planned Repairs, including an example from Winnipeg, MB.
• Emergency Repairs, including a simulated repair in Toronto, ON.
• Restoration options

Published in: Design
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Integrating Silva Cells and Utilities

  1. 1. Silva Cells & Utilities Integrating Silva Cells into the built environment
  2. 2. caption 1 Silva Cells and Utilities • Silva Cell overview • Integrating Silva Cells and utilities • Running utilities through the Silva Cells • Options for when utilities cannot be run through the frames • Planning for the Future • Utility corridors • Future capacity • Utility locations • Locating equipment • One-call network • Directional boring • Repairs and Maintenance • Planned Repairs • Emergency Repairs • Restoration options • Conclusion
  3. 3. Introduction to Silva Cells 2 Introduction to Silva Cells
  4. 4. 3caption Silva Cell overview Silva Cells are a modular shoring system used to support pavements and create void spaces between the pavement and underlying soils that can then be filled with planting soil or other media to facilitate tree growth as well as water infiltration
  5. 5. Silva Cell system are composed of decks and frames Silva Cell overview 4 +/- 18” (45 cm) +/- 12” (30.5 cm) +/- 16” (40.5 cm) 48” (122 cm) 24” (61 cm) Frame Deck Silva Cell overview
  6. 6. Silva Cell overview 5 Deck Frame Silva Cells frames can be stacked one, two or three high. Decks sit on top of the highest frame. Silva Cell overview
  7. 7. Silva Cell overview 6 The Silva Cell frames do not connect to each other horizontally; there is a gap of 1” to 3” (25 mm to 75 mm) between each stack. This allows individual columns of frames to be removed without disturbing the adjacent stacks. Silva Cell overview
  8. 8. 7 Integrating Silva Cells and Utilities
  9. 9. 8Integrating Silva Cells and Utilities There are a number of different ways for integrating Silva Cells with both new and existing utilities Integrating Silva Cells and Utilities
  10. 10. Integrating Silva Cells and Utilities 9 The most commonly used option is to run utilities through Silva Cells. Due to the open design of the frames, they can accommodate pipes, conduits, and other underground utilities up to 10” (250 mm) in diameter. Running Utilities Through Frames
  11. 11. Integrating Silva Cells and Utilities 10 Existing Telecomm lines Running Utilities Through Frames
  12. 12. Integrating Silva Cells and Utilities 11 Irrigation Electric Underdrain (wrapped in fabric) Running Utilities Through Frames
  13. 13. Integrating Silva Cells and Utilities 12 Existing street lighting conduits Running Utilities Through Frames
  14. 14. Integrating Silva Cells and Utilities 13 Existing gas service Running Utilities Through Frames
  15. 15. Integrating Silva Cells and Utilities 14 2” Watermain Copper service Running Utilities Through Frames
  16. 16. Integrating Silva Cells and Utilities 15 Copper water services Running Utilities Through Frames
  17. 17. 16Integrating Silva Cells and Utilities 8” (200 mm) perforated PVC pipe Running Utilities Through Frames
  18. 18. Integrating Silva Cells and Utilities 17 When integrating Silva Cells and utilities, it may not always be possible to run utilities through the Cells. In those cases, one of the following alternatives may be used: • Aggregate gap detail • Bridging utilities with Silva Cells • Bridging utilities with small concrete slabs (< 24” wide) • Bridging utilities with custom concrete slabs (> 24” wide) • Running utilities outside of the Silva Cell frames but in the same excavation ares Please refer to the details on our website (www.deeproot.com) for more information. Alternatives to Running Utilities Through Frames
  19. 19. Options for when utilities cannot be run through frames 18 Geogrid Clear Stone Geogrid One of the simplest options is to leave a gap in the Silva Cells where the Utility is. Then wrap the inside of the gap with geogrid and fill the void space with clear stone (drain rock) to make a stone column. The tree roots will work their way through the stone. Aggregate Gap Bridging
  20. 20. Options for when utilities cannot be run through frames 19 Clean out Geogrid is wrapped around the interior of the opening in the Silva Cells *Clean stone will be placed inside of the geogrid Aggregate Gap Bridging
  21. 21. Options for when utilities cannot be run through frames 20 Clear stone Geogrid (excess is folded over top) Aggregate Gap Bridging
  22. 22. Options for when utilities cannot be run through frames 21 Light pole foundation Geogrid will be installed around the inside of the opening and filled with clean stone Aggregate Gap Bridging
  23. 23. 22 A single layer of Silva Cells can be used to bridge over existing utilities. Geogrid at the sides of the opening Compacted aggregate or backfill soil New or existing utility Bridging Utilities with Silva Cells Options for when utilities cannot be run through frames
  24. 24. 23 Existing concrete drain pipe Bridging Utilities with Silva Cells Options for when utilities cannot be run through frames
  25. 25. 24 Silva Cells on either side of the pipe Bridging Utilities with Silva Cells Options for when utilities cannot be run through frames
  26. 26. 25 Geogrid installed around the inside perimeter of the opening for the pipe *Geogrid is only installed to the top of the 1st layer of Silva Cells, allowing the roots to move freely through the upper layer of Silva Cells Bridging Utilities with Silva Cells Options for when utilities cannot be run through frames
  27. 27. 26 The opening for the pipe is filled with suitable backfill material up to the bottom of the upper layer of Silva Cell frames, and then compacted Options for when utilities cannot be run through frames Bridging Utilities with Silva Cells
  28. 28. 27 Finally, the opening for the pipe is filled in with Silva Cells so that there is no interruption in the upper level of the sytem Bridging Utilities with Silva Cells Options for when utilities cannot be run through frames
  29. 29. 28 Existing electrical conduits that in the way at the tree opening Outline of tree opening Options for when utilities cannot be run through frames Bridging Utilities with Silva Cells
  30. 30. 29 Silva Cells are added at the top layer to support the tree opening Bridging Utilities with Silva Cells Options for when utilities cannot be run through frames
  31. 31. 30 A reinforced concrete slab can be used to bridge over utilities. DeepRoot has a standard detail for gaps up to 24” (600 mm) Reinforced concrete slab New or existing utility 24” max Bridging Utilities with Small Concrete Slabs Options for when utilities cannot be run through frames
  32. 32. 31 Custom designed concrete slabs can be used to bridge gaps larger than 24” (600 mm) Custom reinforced concrete slab Utility duct bank 1 Utility duct bank 2 Bridging Utilities with Custom Concrete Slabs Options for when utilities cannot be run through frames
  33. 33. 32 Silva Cells Duct Bank 1 (green) Duct Bank 2 (blue) Silva Cells Reinforced concrete slab Bridging Utilities with Custom Concrete Slabs Options for when utilities cannot be run through frames
  34. 34. 33 Completed concrete slab Bridging Utilities with Custom Concrete Slabs Options for when utilities cannot be run through frames
  35. 35. 34 The City Of Toronto developed their own custom utility bridging detail for using removable precast concrete panels Concrete header at back of curb to receive the panels on the street side Concrete header poured at on the back side of the utility to receive panels supported by Silva Cells Typical precast panel location Bridging Utilities with Custom Concrete Slabs Options for when utilities cannot be run through frames
  36. 36. 35 When utilities cannot be run through the frames, integrating them into the same excavation is an effective option Limits of excavation Utilities placed in same excavation Running Utilities Outside of the System but in the Same Trench Options for when utilities cannot be run through frames
  37. 37. 36 Telecommunication lines being installed as the Silva Cells are backfilled Options for when utilities cannot be run through frames Running Utilities Outside of the System but in the Same Trench
  38. 38. 37 New electrical duct bank installed along with the Silva Cells Running Utilities Outside of the System but in the Same Trench Options for when utilities cannot be run through frames
  39. 39. 38 Planning for the Future
  40. 40. Planning for the future 39 Corridor between areas of Silva Cells for future utility expansion Establish Utility Corridors for Future Expansion
  41. 41. 40 Extra ducts are added to an electric duct bank for future use Add Future Capacity Where Possible Planning for the future
  42. 42. 41 Planning can be as simple as adding a PVC sleeve for future use PVC sleeve for future use Planning for the future Add Future Capacity Where Possible
  43. 43. 42 Marking where utilities run through the Silva Cell makes locating them in the future easier Marking tape laid on top of the Silva Cells marks the location of lines running through the system Mark Utility Locations Planning for the future
  44. 44. 43 Electromagnetic style locators have been used successfully to locate utilities running through Silva Cells Ground-penetrating radar can also detect the limits of the Silva Cell system. Locating equipment can still be used to locate utility lines once Silva Cells have been installed Planning for the future Use Locating Equipment
  45. 45. 44 Make Silva Cells a permanent part of the local underground utility notification network for future protection Make Silva Cells Part of the Local One-Call Network Planning for the future
  46. 46. 45 Directional boring can be used for future utility installations Silva Cells Planning for the future Directional Boring
  47. 47. Planning for the future 46 Boring head or Pneuma – gopher going in on one side Boring head or Pneuma –gopher coming out the other side Make Silva Cells Part of the Local One-Call Network
  48. 48. 47 Future Utility Installations and Repairs
  49. 49. Future utility installations and repairs 48 1. Locate - Call Local One-Call Agency 2. Excavate - Excavate to level of geotextile - Expose geotextile fabric, cut and fold back, then remove decks - Use a Hydro-Vac or hand dig out soil from area of excavation 3. Repair or add service (lateral) 4. Replace Silva Cells - To replace Silva Cells follow Operations Manual procedures (see www.deeproot.com) 5. Replace permanent surfacing - Replace or patch paving **for further details, see www.deeproot.com or call 415-781-9700** Recommended Protocol For Utility Repairs and New Utility Installations
  50. 50. Future utility installations and repairs 49 Planned water service installation Broadway Ave – mid block between Edmonton and Carlton Streets in Winnipeg, MB Site of installation Repair: Planned Water Service (Winnipeg, MB)
  51. 51. 50 Area of excavation Repair: Planned Water Service (Winnipeg, MB) Future utility installations and repairs
  52. 52. 51 The existing pavement is removed. In this case the existing pavers were salvaged for re - installment The aggregate base is removed and the fabric covering the decks is cut and removed Future utility installations and repairs Repair: Planned Water Service (Winnipeg, MB)
  53. 53. 52 The Silva Cells are removed and the existing watermain exposed where the new connection will be Adjacent stacks of Silva Cells remained in place Existing watermain Repair: Planned Water Service (Winnipeg, MB) Future utility installations and repairs
  54. 54. 53 Once the new service is installed, the excavation is backfilled to the bottom of the Silva frames Silva Cells Future utility installations and repairs Repair: Planned Water Service (Winnipeg, MB)
  55. 55. 54 The Silva Cells frames are re-installed and the existing irrigation and drain lines are run back through the cells Existing irrigation Existing drain Line Repair: Planned Water Service (Winnipeg, MB) Future utility installations and repairs
  56. 56. 55 The Silva Cell frames are filled with soil , the decks are attached and the geotextile fabric is patched Silva Cell decks Future utility installations and repairs Repair: Planned Water Service (Winnipeg, MB)
  57. 57. 56 The aggregate base is replaced, a new curb is installed, and the salvaged pavers are reinstalled to complete the restoration Area of installation after restoration Repair: Planned Water Service (Winnipeg, MB) Future utility installations and repairs
  58. 58. 57 Deeproot along with the City of Toronto and Toronto Hydro participated in a demonstration project that simulated an emergency water main repair scenario Future utility installations and repairs Repair: Simulated Emergency Water Main (Toronto, ON)
  59. 59. 58 Prior to constructing the Silva Cells, a PVC pipe was buried below the level of the Silva Cells to act as a watermain A saw cut was made into the pipe to act like a break in the pipe Repair: Simulated Emergency Water Main (Toronto, ON) Future utility installations and repairs
  60. 60. 59 A typical Silva Cell system is constructed over the buried pipe Future utility installations and repairs Repair: Simulated Emergency Water Main (Toronto, ON)
  61. 61. 60 The planned “break” occurred on a bitterly cold day in January Silva Cell system with concrete pavement now over the top Riser pipe and hose connection to the pipe buried under the Silva Cells Repair: Simulated Emergency Water Main (Toronto, ON) Future utility installations and repairs
  62. 62. 61 A fire hose from a nearby hydrant was connected to the buried pipe via the riser pipe. When the hydrant was turned on, it flooded the area with water *Due to the soil in the Silva Cells being loosely compacted, the water came to the surface very near to the location of the break rather than traveling underground Future utility installations and repairs Repair: Simulated Emergency Water Main (Toronto, ON)
  63. 63. 62 The pavement over the repair area was sawcut into panels and removed with a backhoe Future utility installations and repairs Repair: Simulated Emergency Water Main (Toronto, ON)
  64. 64. 63 The aggregate base was removed and the geotextile fabric over the Silva Cells cut out of the way, exposing the top of the Silva Cells Future utility installations and repairs Repair: Simulated Emergency Water Main (Toronto, ON)
  65. 65. 64 At this point, an effort could be made to salvage the Silva Cells for re use. However, since this simulated an emergency repair, time is of the essence. Therefore, the crew doesn’t stop and just digs right through the Silva Cells Future utility installations and repairs Repair: Simulated Emergency Water Main (Toronto, ON)
  66. 66. 65 Remember, Silva Cells are designed with a 1” to 3” gap between the frames and do not interlock horizontally. Therefore, the adjacent stacks of Silva Cells were not disturbed during the excavation. Adjacent Silva Cells Future utility installations and repairs Repair: Simulated Emergency Water Main (Toronto, ON)
  67. 67. 66 The pipe was exposed and ready to be repaired in essentially the same time as it would be during a traditional repair. *Note that the lightly compacted soil in the Silva Cells generally puts less downward pressure on the sides of the excavation than traditionally compacted soil which helps the excavation stay open better Future utility installations and repairs Repair: Simulated Emergency Water Main (Toronto, ON)
  68. 68. 67 There are two ways to approach restoring that area depending on the time frame in which the work must be completed and the available materials: 1. Restore the area temporarily at the time of the repair and do the permanent restoration at a later date. 2. Restore the area permanently at the time of the repair using one of three permanent restoration options. Future utility installations and repairs Restoration Options
  69. 69. 68 When time is limited, the area can be quickly restored by backfilling the excavation with a lean concrete mix like U-fill or compacted aggregate and temporarily patching the pavement … … Then at a later the date the area can be re excavated and restored permanently using one of three permanent restoration options. Future utility installations and repairs Restoration Options
  70. 70. 69 Option 1 – fill/compact the excavation to the bottom of the Silva Cells and re install new or salvaged frames and decks Option 2 – fill/compact the excavation up to the bottom of the uppermost layer of Silva Cells and re install a single layer of frames and decks Option 3 – fill/compact the excavation to the bottom of the Silva Cells, install geogrid around the perimeter of the remaining opening and fill with compacted soil, clear stone or U-fill (in the case of U-fill try to establish some link between adjacent soil volumes) Future utility installations and repairs Restoration Options
  71. 71. 70 Conclusion
  72. 72. Conclusion 71 There are many options for integrating Silva Cells with both new and existing utilities. Plan for the future wherever possible. Planned and emergency repairs are not much different with Silva Cells and there are different restoration options available depending on the circumstances. Conclusion
  73. 73. Questions? 72 pat@deeproot.com (612) 840-9004 info@deeproot.com 415-781-9700 Questions?

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