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The Objectives of Crown Bracing |
Trees are living beings and as such respond to their environment. Urban living conditions sometimes differ strongly from those under which trees naturally grow up. In this respect, an urban location of trees in many cases has a detrimental effect on the health of urban trees. That leads to biological and static weaknesses, such as for example rotten or too long and slim stems. Trees then turn into a safety risk for the environment and the people.
Tree care activities try to prevent such mainly location-related weaknesses prophylactically or to correct and remove them subsequently.
Crown bracing may provide a sensible addition to species-related proper tree care by helping to maintain a valuable tree in its natural habit or to remove a safety risk like the danger of breakage of weak branches. |
Prevention of Damage |
In the care of trees, just like in medicine, prophylaxis is better then therapy of an existing damage.
Therefore, an experienced and skilled tree guard takes precautionary measures in order to maintain a tree as long and as safe as possible.
It is the maxim to keep the trimming low enough so that the collector surface of the crown and thus the photosynthesis capacity and vitality of the tree are maintained at an optimum level. |
List of Criteria |
State-of-the-art crown bracing must meet the following requirements:
- Freedom from injuries
- Flexible adaptability to individual safety requirements
- Softly attenuating limitation of natural crown movements
- Low-load swinging range for low perceptibility by the tree in gentle breeze
- Support of compensation growth at weak points
- Automatic growing with the tree
- Easy inspection
- Long life and reasonable prices
- Recyclable
- Easy handling
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The Answer |
- Cobra winds around the parts of the trees to be braced without injuring them.
- Cobra installed as a dynamic breaking-bracing allows natural crown movements.
- The Cobra shock absorber softens catching shocks and softly cushions strong movements. The so-called "karate effect" as it occurs with a steel rope is excluded.
- Independent from the rope length, the soft Cobra shock absorber offers an additional play of 20 cm already under very slight loads. That way, a Cobra crown bracing does not restrict crown movements in gentle summer breezes, but fully acts under heavy loads and avoids strong catching shocks and breakage.
- The dynamic Cobra crown bracing gives trees room for movement, which allows them to feel weak points and compensate for them.
- Cobra installed as a static load-bracing avoids the falling down of branches in danger of breakage.
- The specific design of Cobra allows the crown-bracing system to grow with the increase in diameter of the tree.
- Cobra can be easily inspected from the ground and the year of installation can be quickly determined by means of the coloured end caps.
- The black Cobra hollow rope is braided of polypropylene monofilaments and is the rope fibre that is best suited for a long-term use in trees. The degradation of strength is clearly less than 2 % per year and allows a service life of 12 years of the Cobra crown bracing system.
- Except for the shock absorber, Cobra crown bracing systems are uniformly made of polypropylene and can be simply disposed of in the "yellow bag" for recycling.
- Cobra crown bracing can be easily installed on the tree without any tools.
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Fields of Application |
Cobra crown bracing systems can be used for the following fields of application:
1. Dynamic breaking-bracing
- Bracing of defective spots
- Bracing of weak embranchments
- Bracing of V-embranchments
- Bracing of a competing secondary crown
- Increase of the static stability by limitation of crown movements and of the resulting possible "shaking loose" of a tree
- Sewing of an unsafe tree together with its neighbour trees for avoiding a "domino effect in alleys or groups of trees
- Bracing of heavily curved branches
2. Static breaking-bracing
- Bracing and immobilization of torn embranchments
- Replacement of old steel-rope bracin
3. Load-bracing
- Securing of parts of trees in danger of breaking against falling down
4. Bracing after planting
- Dynamic bracing of newly planted young trees
- Dynamic bracing of newly planted large trees
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