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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, certifi ed 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 (confi guration dependent). Using the “RCF Shape
Designer” software it is very easy to understand safety factors and limits for each specifi c confi guration. To better comprehend in which safety range the mechanics are working a simple introduction is needed: TTL33/ TTL31-A mechanics
are built with certifi ed 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 recognized 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 critical 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 defi ned 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.
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S 235 JR characteristic values are R=360 [N/mm2] for Ultimate Strength and Rp0.2=360 [N/mm2] for Yield Strength.
In our prediction software the Safety Factors are calculated considering the Maximum Stress Limit equal to the
Yield Strength, according with many international standards and rules.
The resulting Safety Factor is the minimum of all the calculated safety factors, for each link or pin.
This is where you are working with a SF=7
Depending on local safety regulation and on situation the required
safety factor can vary. 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.
The “RCF Shape Designer” software gives detailed information of the
safety factor for each specifi c confi guration.
The results are classifi ed in 4 classes:
WARNING
• The safety factor is the result of the forces acting on fl y bar’s and system’s front and rear links and pins and depends
on many variables:
- number of cabinets
- fl y bar angles
- angles from cabinets to cabinets. If one of the cited variables change the safety factor MUST BE recalculated using
the software before rigging the system.
• In case the fl y bar is picked up from 2 motors make sure that the fl y bar angle is correct. An angle different from the
angle used in the prediction software can be potentially dangerous. Never allow persons to stay or pass under the
system during the installation process.
• When the fl y bar is particularly tilted or the array is very curved the centre of gravity can move out from the rear
links. In this case the front links are in compression and the rear links are supporting the total weight of the system
plus the front compression. Always check very carefully with the “RCF Shape Designer” software all this kind of situations (even with a small number of cabinets).
System particularly tilted System very curved
-GREEN: SAFETY FACTOR > 7 SUGGESTED
-YELLOW 4 > SAFETY FACTOR > 7
-ORANGE 1.5 > SAFETY FACTOR > 4
-RED SAFETY FACTOR < 1.5 NEVER ADMITTED
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The TTL33-A/TTL31-A module is provided with 4 rigging bars, 2 in
the front and 2 in the rear corners. The rigging bars are securely
connected
to front and rear metal corners. Front and rear metal corners are
securely connected to the cabinet. The rigging system is made of
rigging bars and metal corners in sequence. Rigging bars and metal
corners are securely connected by:
- M10 rectifi ed bolts
- Quick lock pins The wooden cabinet is not a primary part of the
rigging system.
RIGGING SYSTEM
THE TTL33-A FLY BAR
The TTL33-A system must be suspended
using the RCF TTL33-A fl y bar
THE TTL33-A FLY BAR FEATURES:
1 FRONT FLYING BRACKET - Front mounting
2 QUICK LOCK PIN HOLE - Front mounting (to be used to lock
the front bracket before installation)
3 REAR BAR HOLE - Front mounting
4 FRONT FLYING BRACKET - Rear mounting
5 QUICK LOCK PIN HOLE - Rear mounting (to be used to lock
the front bracket before installation)
6 REAR BAR HOLE - REAR MOUNTING.
7 FRONT STACKING POINT.
8 REAR STACKING POINT - UPPER POSITION.
9 REAR STACKING POINT - LOWER POSITION.
10 FRONT BRACKET - TRANSPORT POSITION HOLE.
11 REAR BRACKET - TRANSPORT POSITION HOLE.
12 CORNER DOUBLE-MOTOR PICK-UP POINT.
13 CORNER DOUBLE-MOTOR PICK-UP POINT.
14 12 CENTRAL PICK-UP POINTS.
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