This subtopic addresses the practical skills and underpinning knowledge required to safely sever individual uprooted or windblown trees using a chainsaw. I
Topic Synopsis
This subtopic addresses the practical skills and underpinning knowledge required to safely sever individual uprooted or windblown trees using a chainsaw. It emphasises the critical importance of risk assessment, correct cutting techniques to manage tension and compression forces, and strict adherence to health and safety legislation and industry best practice to prevent accidents and ensure efficient operations.
Key Concepts & Core Principles
- Tension and compression: Understanding how the weight of a fallen tree creates tension on the upper side and compression on the underside of the stem, which affects cutting order and technique to prevent kickback or pinching.
- Cutting sequence: The correct order of cuts (e.g., relieving cut, sink cut, back cut) to safely release stresses and sever the tree without causing uncontrolled movement or damage to the chainsaw.
- Risk assessment: Identifying hazards such as unstable ground, overhead branches, or trapped energy in the tree, and implementing control measures like exclusion zones and escape routes.
- Use of wedges and felling levers: Tools to prevent the saw from being pinched and to control the direction of the cut as the tree settles.
Exam Tips & Revision Strategies
- Always reference relevant legislation (e.g., Provision and Use of Work Equipment Regulations, Personal Protective Equipment at Work Regulations) and industry good practice guides in written evidence.
- In practical assessments, verbalise your actions: explain why you are making a specific cut or why you have chosen a particular stance, demonstrating understanding rather than rote performance.
Common Misconceptions & Mistakes to Avoid
- Failing to accurately interpret the tree’s tension and compression, leading to dangerous barber chairing or sudden trunk movement.
- Standing or positioning oneself in the danger zone (e.g., directly behind a root plate or within the fall path) during cutting operations.
- Neglecting to maintain a firm grip and correct body positioning, increasing the risk of kickback or loss of control when the chainsaw breaches the cut.
Examiner Marking Points
- Award credit for clear demonstration of a systematic site and tree risk assessment, including identification of tension and compression zones, before any cutting.
- Assessors should look for correct selection, inspection, and use of personal protective equipment (PPE) and chainsaw safety features throughout the task.
- Expect to see application of appropriate severing cuts (e.g., step cut, dog-tooth cut) tailored to the tree’s position and tension, with constant awareness of escape routes and exclusion zones.