1. Construction of Rigging Systems Refresher
Barbara A. Knippenburg

2. Student Performance Objective:
Given information from discussion and demonstration, rope, webbing, and hardware, the student will demonstrate the selection of an anchor point, construction of a single point anchor system, a simple mechanical advantage system, a Z-Rig system, a Piggyback Rig system and a System Safety Check. The student will successfully participate in drill activities and demonstrate the construction of anchor points and mechanical advantage systems to a 70% accuracy on a skills check-off sheet.

3. Overview: Anchor Points Single-Point Anchoring System
Simple Mechanical Advantage System (2:1)
Z-Rig System (3:1)
Piggyback Rig System (4:1)
System Safety Check

4. Anchor Points
Purpose:
Means of securing the ropes and other elements of the system to something solid

5. Anchor Points
Selection
–Natural
–Structural
–Man Made

6. Anchor Points
Criteria
Strength required
Direction of pull
Sharp edges
Adequate operating space

7. Anchor Points Components
Rope
Webbing
Anchor hardw are

8. Anchor Hardware
Prusik Knot

9. Anchor Points Anchor Attachment Simple Loop (Figure 8 Follow-Through)
Three Bight
Wrap 3, pull 2
Tensionless Hitch
Commercial Slings

10. Anchor Attachments
Simple Loop – Joined with a Figure 8 follow through

11. Anchor Attachments Three Bight:
Using webbing Or rope tied Into fixed loop. Loop is passed Around the Anchor Into
a bight configuration

12. Anchor Attachments Wrap three pull two: Using webbing Or Rope, wrap
the Anchor three Times and join ends. Pull Two wraps and attach
a carabiner

13. Anchor Attachments
Tensionless Hitch: Rope is wrapped around the anchor 5 or 6 times, then connect the rope back onto itself.

14. Mechanical Advantage Systems Uses:
–Hauling
–Hoisting

15. Mechanical Advantage Systems
Components
–Software
Rope
Webbing
–Hardware
Carabiners
Pulleys
Capture Devices

16. Computing Mechanical Advantage
Number of moving pulleys and multiply by two
Number of moving lines between load and anchor point plus the haul line
Measure amount of rope pulled through the system and the distance load is moved, divide the amount of rope by the distance to get MA

17. Computing Mechanical Advantage
Compound Systems
Mechanical Advantage of initial system
Mechanical Advantage of system attached to haul line
Multiply together

18. Computing Mechanical Advantage
Example: Compound System
Initial system is 3:1 MA
Second system is 4:1 MA Resulting MA?

19. Activity: Constructing a Single Point Anchor System
Anchor Attachment
Simple Loop (Figure 8 Follow-Through)
Three Bight
Wrap 3, pull 2
Tensionless Hitch
Commercial Slings

20. System evaluation and safety check
Anchor adequate
Software/hardware rated for load
Hardware locked
Whistle test

21. Activity: Constructing a Simple Mechanical Advantage System (2:1)

22. Activity: Constructing a Simple Mechanical Advantage System (2:1)

23. Activity: Constructing a Z Rig System (3:1)

24. Activity: Constructing a Piggy Back Rig (4:1)

25. Activity: Constructing a Piggy Back Rig (4:1)

26. Performing a Safety Check
Check each portion of the rig in any rigging system
Ensure safety knots are in place
Test rig and anchors before placing a full load

27. Student Performance Objective:
Given information from discussion and demonstration, rope, webbing, and hardware, the student will demonstrate the construction of a single point anchor system, a simple mechanical advantage system, a Z-Rig system, a Piggyback Rig system, and a System Safety Check. The student will successfully participate in drill activities and demonstrate the construction of anchor points and mechanical advantage systems to a 70% accuracy on a skills check off sheet.

28. Review: Selection of Anchor Point
Constructing a Single-Point Anchoring System
Constructing a Simple Mechanical Advantage System (2:1)
Constructing a Z-Rig System (3:1)
Constructing a Piggyback Rig System (4:1)
Performing a Safety Check