Cushioning the Impact

To sustain each bridge, the builders decided to use bolts that run through the tree trunks, instead of brackets or clamps. The concern was that this second method could complicate both the primary (inward) and the secondary (outward) free growth of the tree. Also, using bolts avoids subjecting the trees to the strong ecological impact that could have been provoked by periodic adjustment of brackets or clamps in order to guarantee bridge safety.

In using the bolt system, however, it was important to choose trees that have defense mechanisms effective against attacks of fungi and bacteria. The trees selected will continue growing freely even above the bolts, without jeopardizing the tension and stability of the cables that hold up the whole bridge system.

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