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Crosby Straightpoint

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arborists

Straightpoint’s (SP) Impact Block, which measures the shock load and weight of branches as they are cut during tree felling or maintenance, is being used for education and site work in Finland.

arboristsreadoutIt is another example of the product filling gaps in knowledge about the forces put through rigging equipment and the weight of loads as they are cut away from trees. It has proven as important as a training device as it is a practical onsite tool, once again.

Utilising wireless dynamic load monitoring electronics and strain gauge technology, real time data can be displayed on a handheld controller, tablet or laptop at speeds up to 200Hz. Importantly, this eliminates the estimation work that often goes into arborist applications. Further, the aesthetic curves of the Impact Block combine with strength and durability to ensure a rope-friendly surface.

Mika Vainionpää, a climbing teacher at Finnish arborist school, Sedu (based in Ähtäri), said: “Unlike crane-related or other typical rigging scenarios, in tree applications professionals do not always have an anchor point above the lifting point. It’s a type of negative rigging. Every tree is different. There are no labels in a tree that say to the climber how much the rig can take. You have to study and learn where those limits are. Branches are one thing—leaves and smaller branches can limit the force—but logs can be more unpredictable.”

Vainionpää, who also owns an arborist company (arborist.fi), recently utilised a 60 kN version to measure how big the heaviest weights are during a normal climb and recorded the weights of the top and base anchors. Impact Block can be installed at the top of a tree or lower in the canopy before starting to cut limbs off. Vainionpää said he predominantly uses 12mm or 14mm Teufelberger Sirius Bull ropes.

He added: “The Impact Block adds weight and rigging to our projects, but that is outweighed by the education it gives us. Trees are very complicated and normal rigging rules don’t apply. However, we are at the lower end of our learning curve with this technology and must continue to conduct tests and deliver education before it can make a widespread difference across arboriculture. For that reason, it remains more of a training product than a site-only tool.”

Impact Block is an integral product in Vainionpää’s armoury, which includes a 27-tonne metre knuckle-boom crane that can be fitted with a grapple saw or bucket; a mobile elevated work platform; stump grinders; and a machine for pruning branches and removal of felled loads.


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