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5.7
Counterbalancing of Monorail Systems
When the load is at the outboard end of the Monorail/Trac, the inboard end of the
Monorail/Trac will have a lifting tendency, and must be properly counterbalanced
or secured in place. A load suspended at the outboard end of the Monorail/Trac
will exert an upward force of approximately one half its weight on the inboard end
of the Monorail/Trac.
Scaffold sections in a Scaff-Trac mounting system must be pinned or bolted
together to resist the weight of the load at the outboard end. In addition, extra
weight can be added above the rear (inboard end) scaffold frame. When first lifting
the maximum weight, the job superintendent should inspect the scaffold in the
vicinity of the hoist operation to ensure that the scaffold components are NOT
distorted or separated.
Counterbalancing Calculations
For safe equipment operation, the proper amount of counterweight must be
calculated and applied. The Trestle Monorail and Scaff-Trac use one type of
calculation, and the Vertical Post type mounting system uses another. Know which
system is being used and apply the appropriate calculation. This calculated amount
of weight must be used to counterbalance the system.
When mounting to Trestle Monorail or Scaff-Trac:
1.
Know or find the weight of the hoist model being used.
2.
Know or find the weight of the payload to be lifted.
3.
Know or find the length of the outward cantilever.
4.
Add the weights of the hoist and the load together.
5.
Multiply this number by the length of the outward cantilever.
6.
Multiply this number by two. This is a safety factor multiplier.
7.
Divide by the length of the backward cantilever.
8.
This number is the amount of weight required to counterbalance the system.
Summary of Contents for Beta Lite
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