MIS303 Tree Dismantling 2nd ed.

Member Price:
Non-Member Price:
NZ-wide Shipping:
$46
$55
$11.50
All prices in NZD inc GST
This book is one in a series of Minimum Industry Standards produced by Arboriculture Australia Ltd and the New Zealand Arboricultural Association in consultation with the national arboriculture community in both countries. These industry peer-reviewed documents provide a ‘body of knowledge’ which is shared by practitioners and can be used as the basis for training, dissemination of skills and professional development.
This standard covers the basics of tree dismantling, including rigging techniques, the use of a chainsaw in trees, and some fundamental concepts of rigging forces and rigging system design.
Information on equipment inspection, site setup, pre-start checks, tree inspection, rope use, knot tying, the operation of chainsaws, tree felling and tree access is contained within the appropriate MISs for those work tasks.
Contents
1: Preparing for tree removal
Introduction to tree rigging and dismantling
Arriving on site
Scope of works
Preparing to remove trees – site setup
Tree removal strategies
Tree inspection for dismantling
Hazard control measures for tree dismantling
Basic rigging concepts
Parts of an aerial rigging system
Selecting and inspecting rigging equipment
Rigging equipment: general concepts and terminology
Rigging equipment inspection checklist
Aerial rigging systems
Common components of a rigging system
Selecting anchor points in trees – tree strength and structural integrity
Fixed rope anchor points – attaching a rope
Running bowline
Round turn with 2 half-hitches
Main attachment knot plus half-hitch
Clove hitch with two half-hitches
Cow’s hitch with better half
Timber hitch
Karabiner
Karabiner and sling
Shackle or similar connector
Other fixed-rope attachments
Moving rope anchor points
Natural crotch
Block, rigging block, impact block
Pulleys
Rigging rings
Moving rope anchor point attachment components
Sling, tape sling, tube tape sling
Loopie sling
Whoopie sling
Dead-eye sling
Other anchor points and attachment options
Rope brakes
Trunk wraps
Wraps in tree
PortaWrap or similar floating friction brake
Bollard, drum or similar
Rigging equipment configuration and proper use
Example of misconfigured rigging equipment
Designing a rigging system
Rigging system design considerations
Estimating weight of sections
Tree species density table
Introduction to forces in rigging
Different loads on components in rigging system
2: Dismantling trees
Performing works
Communication during tree work
Call-and-response protocol
Hand and whistle signals for use on tree sites
Using a chainsaw in trees
Cut sequences and techniques – branches
Straight back cut
Step cut – undercut made first – top cut inside
Step cut – undercut made first – top cut outside
Step cut – top cut made first
Step cut – lateral cuts
Scarf and back cut – downward
Scarf and back cut – upward
Box cut
Cut sequences and techniques – tree heads and timber
Falling the head out of a tree
Falling sections of timber
Falling sections of timber – landing sections flat
Cutting techniques where trunk diameter is greater than bar length
Blocking down: step cuts on timber
Falling techniques for tree dismantling – use of wedges and taglines
Rigging operations
Rigging attachment point: cut and behaviour
Rigging upright sections
Rigging lateral sections or branches
Rope control during rigging operations
Rope control: rope brakes and friction management
Installing rope brakes
Using rope brakes: adding tension
Rope control during rigging operations – general principles
Tips for using rope brakes
Returning rigging components
Specific rigging techniques
Natural crotch rigging
Applying friction at the point of cut
Techniques for applying friction at the point of cut
Branch removal – wraps method 1
Branch removal – wraps method 2
Artificial rope brake at point of cut
Snatching – wraps at point of cut
Snatching
Minimising peak force in negative rigging
Estimating peak loads in negative rigging
Mass damping
Bracing a rigging point
Floating anchors: highlines and multiple point floating anchors
Speed line or zip line
Running anchor rigging
Running anchor rigging example
Lifting systems
Guying a tree
3: Completing tree removal
Biosecurity and transmission of pathogens
Completion of works
Appendix A: Rigging system diagrams
Positive rigging systems
Simple anchor | friction at base of tree
Butt tying
Tip tying
Use of a tagline 76
Use of multiple anchor points
Cradle rigging
Lifting
Friction applied at anchor point/s in tree
Use of multiple rigging ropes – shared load or load transfer 11
Floating anchor 1: single floating anchor 12
Running anchor 1 183
Running anchor 2: speed line 184
Floating anchor 2: high line 185
Negative rigging systems
Snatching
Snatching – friction at point of cut
Negative rigging – redirects
Friction at the point of cut 1: negative branch rigging
Friction at the point of cut 2: transferring loads
Running anchor 3: negative rigging
Vertical speed line
Appendix B: Working the angles
Introduction to forces
Working in newtons
Force, lever arm and bending moment
Lever arm
Force vectors at anchor points
Deflection forces