THE BRAND WITH A SECURE FUTURE

Trees that are safe in the long run

Since 1993: the most successful crown bracing system in the world. After 12 years of experience from the inventor, further developed in 2005 under the name  the hollow ropes with the red thread.

  • Competent optimized for ZTV-Baumpflege (guidelines for German tree care standards) application recommendation 12 years, with  certificate.
  • Quality = safety = long-life cycle = cost reduction, manufactured by the two noted ropery in Germany. & LIROS
  • Strong and safe, tested static and dynamically in 2 testing laboratory Lloyd and Edelrid  .
  • 12 years  application recommendation, 50 % longer  than according to ZTV.

 

The crosswise-compatibility (TCC)

Treetops are complex enough - therefore just  

  • Effective low load bearing width (NLSB) with shock absorber prevents incorrect growth and promotes compensatory growth.
    Dynamic breaking protection with shock absorber, static breaking and load-bearing protection without shock absorber.
  • Installation without torch or tools.
  • Annualmarkings. 8 colors in the same sequence.

PP-hollow rope with long-term stability
 

EPDM shock absorber
 

expansion insert (PP)
 

anti-abrasion hose (PP)

 

assembled boa - tree cabling system
 

The same components for all 3 rope thicknesses.

  • Maximum flexibility saves space, transportation, waste, time and in addition to the longer operating time even more money.

Lightfast annual disc to show year of installation.

WORLD'S ONLY KINKING-FREE CROWN BRACING ROPE

It is a nuisance to arborists when the rope comes of the spool tangled. boa hollow rope employs a special, newly patent winding method/ Kinking-free
which ensures that the 2 to and the 4 to cables come of the spool tangle free.

INSTALLATION TIPS - HELPFUL AND USEFUL

Platanenallee Tübingen - boa load-bearing system in function

ASSEMBLING THE COMPONENTS

7 steps to success

  • Quick installation without a splice awl. No torch required.
  • Easy to check - non-fading disc with Annual code color according to ZTV.
  • Direction of pull for Kinking-free rope removal from the top of the jute bag, for 2 t / 4 t.

TYPES OF SECURING ACCORDING TO ZTV TREE CARE STANDARDS

Dynamic cabling system

For natural growth, the crowns of tree need to move freely and not be rigidly anchored. Dynamic crown stabilization prevents excessive movement, and a flexible rope acts as a gentle brake. The shock absorber is especially advantageous when compensating for weaknesses since it also allows for some movement in light winds. This is the ideal application for boa 2 and 4 tonne systems with shock absorbers.

 

Static cabling system

When V-forked codominant stems with ingrown bark show cracks, movement should be completely prevented. Movement can be stopped using a static or rigid cabling system. In those instances shock absorbers should not be used in the cabling system. For rigid cabling, the loadbearing capacity of the ropes needs to be doubled as compared to dynamic systems. For rigid bracing, the boa 4 tonne system with no shock absorber or the extremely rigid boa silver/black 8 tonne system (for which there is no shock absorber) should be used.

 

Branch weight supporting - load cabling system

It is not always possible to secure a tree crown that nothing will fail. However, if there is a possibility of a branch failure, it is necessary to ensure that nothing can fall to the ground. Systems to catch falling branches are impractical in trees because there is no anchor point which could withstand the resulting drop energy. Therefore, load cabling system are installed in a vertical orientation. For this type of application, all tree boa systems without shock absorbers or the extremely rigid boa silver/black 8 tonne system (for which there is no shock absorber) should be used.

 

This is how  should be dimensioned according to ZTV Baumpflege:

Dynamic cabling system chart 1: installing the cabling system at 2/3 of the height of the stem

Branch base diameter Recommended load bearing capacity during guarantee period
up to 40 cm 2 to
40-60 cm 4 to
60-80 cm 8 to
Static cabling system: double these collapse loads

Load cabling system chart 2:

Branch base diameter Minimum load bearing capacity
until 30 cm 2 to
30-40 cm 4 to
40-60 cm 8 to
60-80 cm 16 to (installation of 2 x 8 to is possible)

boa provides a 12-year product life expectancy rather than the 8 years minimum required in the German regulation.