15
5.
RIGGING
THE SYSTEM
WARNING
• The system must be rigged in accordance with the laws and regulations of the Country where the system is used. It is
responsibility of the owner or rigger to make sure that the system is properly rigged in accordance with Country and
local laws and regulations.
• Always check that all the parts of the rigging system that are not provided from RCF are:
-appropriate for the application
-approved, certified and marked
-properly rated
-in perfect condition
• Each cabinet support the full load of the part of the system below. It is very important that each single cabinet of the
system is properly checked.
“RCF SHAPE DESIGNER” SOFTWARE AND SAFETY FACTOR
The suspension system is designed to have a proper
safety factor
(configuration dependent). Using the “RCF Shape
Designer” software it is very easy to understand safety factors and limits for each specific configuration. To better com-
prehend in which safety range the mechanics are working a simple introduction is needed: TT+ line arrays mechanics are
built with certified
UNI EN 10025-95 S 235
JR Steel. RCF prediction software calculates forces on every single stressed
part of the assembly and shows the minimum safety factor for every link. S 235 JR is a structural steel and has a stress-
strain (or equivalent Force-Deformation) curve like the following:
The curve is characterized by two critical points: the
Break Point
and
the
Yield Point.
The tensile ultimate stress is simply the maximum
stress attained. Ultimate tensile stress is commonly used as a criterion of
the strength of the material for structural design, but it should be reco-
gnized that other strength properties may often be more important. One
of these is for sure the Yield Strength. Stress-strain diagram of S 235 JR
exhibit a sharp break at a stress below the ultimate strength. At this cri-
tical stress, the material elongates considerably with no apparent change
in stress. The stress at which this occurs is referred to as the yield point.
Permanent deformation may be detrimental, and the industry adopted
0.2% plastic strain as an arbitrary limit that is considered acceptable by
all regulatory agencies. For tension and compression, the corresponding
stress at this offset strain is defined as the yield.
GENERAL RIGGING WARNINGS AND SAFETY PRECAUTIONS
• Suspending loads should be done with extreme caution.
• When deploying a system always wear protective
helmets and footwear.
• Never allow people to pass under the system during
the installation process.
• Never leave the system unattended during the
installation process.
• Never install the system over areas of public access.
• Never attach other loads to the array system.
• Never climb the system during or after the installation.
• Never expose the system to extra loads created from
the wind or snow.
Summary of Contents for TTL31-A
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