ASWP16 Use of a Mobile Crane to Remove Trees
5.4 Crane Rigging
Step Action
Determine load
Communicate with crane operator intended sling location
and cut location
Determine weight of load to be cut using Green Wood
Weight Charts, rules of thumb etc.
Relay weight of load to crane operator
Crane operator decides if load
is within their lifting
capabilities
Crane operator communicates acceptance or rejection of
proposed cutting location based on whether load is within
their capabilities
Crane operator and worker aloft will agree on the final
cutting location
Set choker around section of
tree
Ensure choker is secured to tree
5.4.1 Crane Rigging – Multi Leg Sling Configuration
Step Action
Secure one leg of sling to limb
Multi leg Sling Configurations
Place choker so that headache ball is over the centre of
gravity of the limb
Ensure that the Safe Working Loads (SWL) of the sling is
not encroached
Ensure that when sharp angles are placed on connection
between slings and load the Safe work Load (SWL) is not
compromised
Utilize a Sling Angle Load Chart
Ensure bend ratios for slings are not exceeded
Secure second leg of sling to
limb
Ensure that there is no slack in the multi leg sling
configuration
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