Crown lock

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Ropes on a plane tree infected with fungus on a busy road

The term crown protection is used in the field of tree care and describes a measure to secure tree crowns or individual branches together with strong branches, whereby consideration is given to preserving the natural shape of the tree (the habitus ) with as little pruning as possible.

Crown securing is carried out to secure any damaged areas on trees and to ensure general traffic safety on high-traffic roads near trees that are at risk of breaking. In addition, the crowns of old trees, some of which are natural monuments, are preserved and stabilized. In addition, relief can be achieved within the trunk area or strong branch area so that the risk of accidents is prevented and the risk of injury to humans and animals is reduced.

Crown locking systems

Crown locks differ as follows:

  • With dynamic crown securing , individual branches or twigs of the tree crown are connected to one another by elastic ropes or straps to prevent endangered branches from being torn out or to maintain the stability of a tree.
  • The static crown securing is carried out in order to contain the dangers emanating from, for example, already torn bulbs and to secure the damaged area in a permanently stable manner. The main task is to keep movements of the tree, which increase the damage or cause the risk of accidents, as low as possible.

execution

A crown lock is attached by stranding or screwing in the crown area using straps, ropes or - if the risk is particularly high and there is a good prospect of the best possible overburden - screw rods that permanently connect and secure two or more sides of a break or overloaded branches. Here arborists are employed, who penetrate into the crown area either by rope climbing technology or with the help of an aerial work platform and carry out the necessary work to secure the tree there.

The stranding technology, both dynamic and static, provides for regular checks that should be carried out within a period of one to three years depending on environmental factors, such as the age and condition of the tree and the weather.

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