Installing the ASP in a Trench

Sand Filled Trench

This method provides optimal protection for the ASP in environments with large aggregate or debris.

1. Excavate Trench

   • Minimum 800mm deep x 500-1000mm wide

   • Ensure the base of the trench is even and any slopes are gradual

2. Prepare Base

   • Line the trench with a suitable geotextile

   • Lay 300mm compacted sand/stone free clean fill on the bottom of the trench

3. Position ASP

   • Lay the ASP along the centreline of the trench on top of the compacted sand/clean fill

   • Coil excess length on top of the reference pad and bundle with cable ties

   • Fix the reference sensor to the reference pad using the ASP fixing bracket

4. Connect Data Cable

   • Run the data cable through a flexible conduit to the data logger location

   • Connect to the data logger

5. Function Test

   • Test the ASP for functionality to ensure no damage has occurred during installation

6. Survey and Record

   • Have a surveyor record the position of the ASP reference point

   • Record positions at intervals along the length of the ASP at each node position

7. Cover ASP

   • Lay another 300mm of compacted sand/fill on top of the ASP

   • Wrap the geotextile over the top of the trench, one side overlapping the other

   • Form a continuous, enclosed, sand-filled cylinder the length of the trench

8. Warning Tape

   • Lay detectable underground warning tape along the length of the trench

   • Position directly above the alignment of the ASP

9. Backfill

   • Place a layer of general site fill to fill the remaining depth of the trench

   • Ensure at least 200mm depth once compacted

10. Post-Installation Checks

    • Conduct another function check to ensure no damage has occurred during backfilling

    • Bury the reference pad and sensor, ensuring the settlement point is easily accessible

11. Stabilization Period

    • Allow the system to stabilise for 24-48 hours before taking a base reading

Directly Buried

Where the host material is adequately stone and debris free, the ASP can be directly buried.

1. Excavate Trench

   • 500mm deep x 300-500mm wide

   • Install reference pad as described above

2. Position ASP

   • Lay the ASP within the trench

   • Coil excess hose length on top of the reference pad and bundle with cable ties

   • Fix the reference sensor to the reference pad using the ASP fixing bracket

3. Connect Cable

   • Run the cable through a flexible conduit to the data logger location

   • Connect to the data logger

4. Function Test

   • Conduct a function check to ensure that no damage has occurred during installation

5. Survey and Record

   • Have a surveyor record the position of the ASP reference point

   • Record positions at intervals along the length of the ASP at each node position

6. Backfill

   • Backfill the trench with the excavated material

   • Compact in layers to ensure competent support all around the ASP hose

   • Ensure at least 300mm of compacted material is covering the ASP

7. Warning Tape

   • Lay detectable underground warning tape along the length of the trench

   • Position directly above the alignment of the ASP

8. Complete Backfilling

   • Fill and compact the remaining depth of the trench with the excavated material

9. Post-Installation Checks

   • Conduct a function check to ensure no damage has occurred during backfilling

   • Bury the reference pad and sensor, ensuring the settlement point is easily accessible

10. Stabilization Period

    • Allow the system to stabilise for 24-48 hours before taking a base reading