Pulling Test


description

At present, the most accepted method for evaluating the safety and stability of trees is the pulling test. It involves applying a bending load on the trunk via a cable attached to the tree. The method can be used either to assess the uprooting stability of the tree, or to establish the risk of trunk breakage.


Make sure you follow all the safety instructions throughout the test!

  1. Attach the cable to the trunk in the crown of the tree, as high as possible.
  2. Chose an anchor point in the appropriate direction, about 10 to 15 m from the tree.
  3. Set up the winch and ropes according to the guide.
  4. Install the load cell.
  5. Install the inclinometer sensors.
  6. Install the extensiometer sensors.
  7. Connect all sensors to the central unit.
  8. Switch on the units, and press “Tara” on the load cell.
  9. Start the Pulling Test software.
  10. Start measurement by loading the cable slowly and evenly using the winch.
Pulling test - inclino
  • Inclinometer (1 or 2 pcs.)
  • Base plate with ball head
  • Battery box, 9V rechargeable battery
  • Battery charger
  • Central unit
  • Force meter and display
  • Serial cables connecting sensors and central unit
  • Software on CD
  • User's manual
  • Pulling device (optional)


Pulling test - elasto (extension package)
  • 2 elastometers in quick mounting house
  • Dual elastometer box
  • Screw and screwdriver
  • Batteries and battery charger
  • Serial cables connecting dual elastometer box and central unit


Cable and winch
Cable length
20 m
Winch
1.6 or 3.2 metric ton


Load cell
Calibrated
yes
Cable-mounted
yes
Capacity
5 T
External display
Rinstrum
Connection to central unit
RS232
Sampling rate
1 Hz
Hex key
6mm
Powered by
4 AA size rechargeable batteries


Inclinometers
Sensor
ST-015
Measurement range
±2 degrees
Resolution
0.001 degree
Temperature compensated
yes
Sampling rate
10 Hz
Power source
9V battery
Weather proof, IP65
yes, IP65


Extensiometers
Type
LVDT
Dimensions
30x30x270 mm
Span
250 mm
Sampling rate
1 Hz
Resolution
0.3 μm
Power source
2 pcs. of 9 V batteries


  •  Pulling Test (size: 1.7 MB)