Microsoft PowerPoint - Construction of Rigging Systems ...
Construction of Rigging Systems Refresher Barbara A. Knippenburg 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. 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 Anchor Points Purpose: Means of securing the
ropes and other elements of the system to something solid Anchor Points Selection Natural
Structural Man Made Anchor Points Criteria Strength required Direction of pull
Sharp edges Adequate operating space Anchor Points Components Rope
Anchor Attachments Simple Loop Joined with a Figure 8 follow through Anchor Attachments Three Bight: Using webbing
Or rope tied Into fixed loop. Loop is passed Around the Anchor Into a bight configuration
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 Anchor Attachments Tensionless Hitch: Rope is wrapped around the anchor 5 or 6 times, then connect the rope back onto itself.
Mechanical Advantage Systems Uses: Hauling Hoisting Mechanical Advantage Systems Components
Software Rope Webbing Hardware Carabiners Pulleys
Capture Devices 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 Computing Mechanical Advantage Compound Systems
Mechanical Advantage of initial system Mechanical Advantage of system attached to haul line Multiply together Computing Mechanical Advantage Example: Compound System
Initial system is 3:1 MA Second system is 4:1 MA Resulting MA? 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 System evaluation and safety check
Anchor adequate Software/hardware rated for load
Hardware locked Whistle test Activity: Constructing a Simple Mechanical Advantage System (2:1)
Activity: Constructing a Simple Mechanical Advantage System (2:1) Activity: Constructing a Z Rig System (3:1)
Activity: Constructing a Piggy Back Rig (4:1) Activity: Constructing a Piggy Back Rig (4:1) 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 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. 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
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