Aerial tree rigging methods

Aerial Tree Rigging Methods Overview

  • Aerial tree rigging is a technique used for the removal or pruning of large or potentially dangerous trees.
  • The method involves the usage of rigging ropes, pulleys, friction devices, and other specialised equipment to secure tree sections before cutting and lowering them to the ground in a controlled manner.
  • This method facilitates safe and efficient removal of tree sections while reducing risk to the climber and potential damage to the surrounding area.

Basic Rigging Operations

  • Natural Crotch Rigging: The most basic form of rigging, where the rope passes over a branch or through a crotch in the tree. It is less complex but causes more wear to the rigging ropes.
  • Block and Sling Rigging: A more advanced method, requiring an additional device (the block) and sling to be installed in the tree. This reduces wear on the rope and allows more control for the climber.
  • Multispan Rigging: Used for very large limbs, sections, or even entire trees. Several rigging points are established within the tree and the piece is lowered in a controlled manner, often using mechanical advantage systems.

Required Tools

  • Rigging Ropes: Special ropes used for supporting the weight of cut sections.
  • Slings and Straps: Used to attach the rigging ropes to the tree or to a block.
  • Blocks and Pulleys: Devices used to help manoeuvre the rope and control the lifting or lowering of tree sections.
  • Friction Devices: Used to provide resistance, allowing the safe and controlled lowering of tree sections.

Safety Aspects

  • Competency: Rigging operations are high-risk and should only be undertaken by individuals with training and competence in aerial tree rigging.
  • PPE (Personal Protective Equipment): Essential for maintaining safety, these include gloves, helmets, riggers boots, and climbing harnesses.
  • Equipment Inspection: Frequent inspection of all rigging equipment should be conducted to ensure there is no wear or damage.

Environmental Implications

  • Wildlife Conservation: Prior to the operation, survey the tree for wildlife such as bird nests and bat rooves.
  • Area Protection: Carry out work in a manner that minimises damage or disturbance to the surrounding area.
  • Waste Management: Cut sections should be appropriately disposed of, recycled, or re-purposed.