2.1.2 Utilising crane for access
Tree work has evolved to include the use of cranes to remove trees too difficult to remove by traditional dismantling techniques . It is accepted practice in New Zealand and in most of Australia to utilise a technique called “ riding the hook ” to access and dismantle the tree .
A worker will establish the climbing system on the hook of the crane on the ground , then be lifted into the tree by the crane operator . They will then abseil into the tree ’ s canopy where they attach the section to be lifted out utilising the crane ’ s lifting chains . The tree climber then removes their climbing system from the hook , attaching themselves into the tree .
The tree climber cuts the tree , and the crane operator lifts out the section , leaving the climber behind . This process is repeated with the worker attaching and detaching from the hook to safely move around the tree . The tree effectively never sees load applied like in the traditional dismantling technique and the
climber stays safely out of the way of the lifted load .
Where a crane was in use at the time of the accident , it will still be present when the rescue team arrives . If the arborist was not attached to the crane when they were injured ( for example if they were struck by the load after it was cut free ) the crane will be available as a potential rescue tool .
The use of dedicated rescue appliances should always be considered before utilising an unfamiliar crane and operator . Unfortunately , tree work sites often have limited space for the setup of heavy machinery , and it can take several hours to derig a crane to clear the site . In these circumstances , the use of a crane to provide a suitable rated anchor point above the casualty should be considered before choosing to climb the tree .
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