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Strengthening system of the surface of closed-type metallic
roller shutters towards externals wind loads.
Implementation:
The closed type metallic roller shutters, generally used as
industrial doors,
are easily fitted in every place.
Furthermore they present long
lifetime while keeping the cost
low.
The only disadvantage is the limited strength to the
external wind loads on account of the elasticity that the
outer surface of the roller shutter presents when it is
lowered or closed.
As the
deflection
increases,
the wind can remove
the roller shutter out of the drivers resulting in failure
or damage.
Various systems have been reported to protect against wind
loads, as special hooks at the bottom bar of the roller
shutters that move in drivers. There is a massive
disadvantage in those systems
because:
-
The hooks do not have adequate strength to hold the huge
wind loads that develop.
-
When wind loads are exerted,
τhe
adhesion of hooks to drivers increases resulting in a
movement difficulty
of the roller shutter
particularly when the wind is strong.
-
The
hooks prevent the coiling thus promoting
potential
engagement of the roller shutter with the side
parts
(hoods, etc.)
For the above mentioned reasons, we present our own system
for protection against wind loads. |
