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Section 3 Constructing Raising/Lowering Systems

Section 3 Constructing Raising/Lowering Systems. Anchoring Systems Limited only by the: Situation Equipment Available Knowledge of the RESCUER. Anchoring Systems. Must be safe and dependable Common types: Single point Multi-Point. Single Point Anchor. Types: Tensionless Two-bight

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Section 3 Constructing Raising/Lowering Systems

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  1. Section 3 Constructing Raising/Lowering Systems • Anchoring Systems • Limited only by the: • Situation • Equipment Available • Knowledge of the RESCUER

  2. Anchoring Systems • Must be safe and dependable • Common types: • Single point • Multi-Point

  3. Single Point Anchor • Types: • Tensionless • Two-bight • Multi-wrap

  4. Tensionless • Used on large diameter anchor points • Running end of rope wrapped 4 times • Secure with Figure 8

  5. Tensionless Wrap (hitch) Less angle the better Hitch with Fig.8

  6. Two-Bight Anchor • Used with webbing around anchor point • Carabiner used to secure bights and rope together

  7. Multi-Wrap Anchor • Use webbing around anchor point • Place Water Knot • Snug up by pulling two wraps from middle • Use carabiner to attach rope

  8. Multi-Point Anchors • Load Sharing • If load shifts, stress is placed to one point • Self adjusting • If load shifts stress is kept to both points

  9. Multi-Point Anchors • Two Point • Three Point

  10. Multi-Point Anchor

  11. Affect Of Angles on Anchor System • The wider the angle the more stress to each leg of the anchor point 115 LB 115 LB 120° 200 LB 200 LB 60° 200 LB 200 LB

  12. Mechanical Advantage Systems • System of pulleys and Rigging to reduce force used to raise and lower loads • Simple • 2:1 • 3:1 • 4:1

  13. 2:1 System • One Pulley • Light loads

  14. 3:1 System • “Z” rig • Rescue Situations

  15. 4:1 System • Heavier Loads

  16. Belay • Person on Rope, BELAY • Belay devices • Prussik Knots • Brake Bars • Figure 8’s • Munter Hitch • Chisnall Hitch

  17. Prussik Knot

  18. Munter Hitch

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