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ProtectaWeb Slope Stabilisation Installation Procedure

Preparation

  • Start site preparation for the ProtectaWeb slope protection system by removing debris and vegetative cover from the embankment area.
  • Complete other earthworks, excavation and/or fills.
  • Remove unacceptable in-situ soils that are for the ProtectaWeb slope protection system and replace with suitable materials.
  • Excavate the specified toe-in trenches where specified along the crest and at the bottom of the embankment area being protected.

Embankment Protection and Drainage

  • Install the Multitrack 1000 over the slope and secure in position according to the manufacturer’s recommendations. When excessive ground water is present, a nonwoven geotextile is recommended.
  • Install the appropriate geocomposite drainage system (site specific). Ensure that the system is functional and connected to the suitable drainage outlet.

Installation of ProtectaWeb Slope Protection Sections

  • Drive specified straight Pins part way into the ground along the toe-in trench or along the top of the area to be protected at the following longitudinal centres.
  • Expand the ProtectaWeb section and place each expanded end cell of the section over its corresponding pre-installed stake. 3. Drive the stake Pins through the cells ensuring the hook loops over the cell wall.
  • Expand the ProtectaWeb section down the slope to the fully expanded length of the section.
  • Hold the fully expanded sections open using one of the following options. Other options are also acceptable:
    • Straight stakes / pins (permanent or temporary)
    • Infill several of the peripheral cells
  • Check each ProtectaWeb section to ensure that it is fully expanded. Full expansion of sections will result in a better fitting and looking slope protection.
  • Correctly align and interleaf edges of adjoining ProtectaWeb sections and ensure that the upper surface of adjoining sections are flush.
  • Fasten ProtectaWeb sections together with staples or as specified in contract documents.
  • Drive additional straight stakes or Pins at the specified spacing within the cells of the expanded ProtectaWeb.
  • If the slope length is longer than one expanded ProtectaWeb section, drive another row of stakes at the bottom end of the expanded section per item 1 above and continue with the new ProtectaWeb section per item 2.

Placement of infill in ProtectaWeb sections

  • After ProtectaWeb sections have been secured to the slope, begin infilling with the specified materials.
  • Place infill in expanded cells with suitable material handling equipment.
  • Limit drop height of infill material to 1 m maximum.
  • Avoid displacement of ProtectaWeb sections by infilling from the embankment crest to the toe.
  • Overfill ProtectaWeb sections and compact infill material as follows:
    • Screened top soil, overfill between 25 mm and 50 mm and lightly tamp to leave soil flush with top edge of cell walls. Apply specified surface treatment.
    • Loose granular materials, overfill 25 mm and compact with a plate tamper or machine bucket. Remove loose surface material so infill is flush with top edges of cell walls.
    • Concrete, fill to top edges of the cell walls and compact manually or with vibratory equipment. Apply specified finish to concrete infill