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The panels with concatenated rings are an excellent protection against rockfalls. Thanks to their strength and high resiliency they were installed in times of war across the entrance to naval installations as barriers against submarines and torpedoes (from which they were given their common name "parasil", "torpedo arrester").
They are used in active-type applications to stabilize loose rock masses, as well as in passive-type applications (as rockfall barriers).
These panels are made with concatenated rings with a maximum diameter of 350 mm made of continuous strands of not less than 10.5 mm in diameter.
The concatenated rings can have 4 or 6 contact points and form panels of different sizes weighing not less than 6.0 kg/sq.m.
This type of net gives excellent results in rockfall barriers. When struck by a boulder rolling down a slope, the rings involved are strained in an elasto-plastic manner, thus dissipating the energy by deformation.
In the case of very high-energy impacting masses, the stresses absorbed by the net panels are also transmitted to the guy ropes and the braces, both of which are provided with special energy absorption devices.
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