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Spider Leg Rigging

4:11
14:40
56.7K views

At 4:11 in

The Most dangerous Tree job I've seen. 4k video

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What happens here

The arborist explains the 'spider leg rigging' technique. This involves using multiple slings (e.g., one 35-foot and two 25-foot slings) to create a balanced lift point around a tree section. The goal is to position the crane's ball directly over the center of gravity of the piece being cut, ensuring that all slings are under equal tension. This prevents shock loading and allows the piece to be lifted straight up without twisting, which is crucial for safety and efficiency, especially when dealing with heavy sections and avoiding damage to the crane.

Goal: Explain and demonstrate the 'spider leg rigging' technique for balanced lifts.

Tools and materials

  • Crane with Grapple National Crane — Providing the lifting mechanism for tree sections
  • Slings — Securing the tree section to the crane

What they say

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okay that's it for now what we're doing these this is called spider leg rigging spider leg meaning it's sort of like a web okay I've got three straps on here this one 35 shorter ones or 25 what we do is position the ball over the center of gravity for the pick the pick being the piece that we're planning to sever from the tree and hoist up okay if you want to have it right at the center of gravity so that way all the slings are attention the same and when we make the cut that should fit straight up so there's no dropping there's no shock loading in this system because that's that's a bad thing in this system because the boom boo-boom doesn't like to bounce want everything to be static

Auto-generated from the video audio.