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What Is A Scaffold?An elevated, temporary work
platform
Three basic types:
Supported scaffolds -- platforms
supported by poles, legs, frames,
& outriggers
Suspended scaffolds -- platforms
suspended by ropes or overhead
support
Aerial Lifts -- such as cherry
pickers or boom trucks
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Hazards
Falls from elevation caused byslipping, unsafe access, and the
lack of fall protection Struck by falling tools / debris
Electrocution from overheadpower lines
Scaffold collapse Bad planking giving way
Employees working on scaffolds are
exposed to these hazards:
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Supported Scaffold
Requirements:
Proper scaffold access
Keep scaffold free from
debris Place scaffold legs on
firm footing
Provide guardrails
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Supported Scaffold
The height to base
ratio should not be
more than four (4)unless guys, ties, or
braces are used6 m
1.5 m
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Suspended Scaffolds
Train employees to recognize
hazards
Secure/tie to prevent swaying
Personal Fall Arrest System
(PFAS) must anchor
independently of the scaffoldsupport system
Ropes capable of supporting 6
times the load
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Employees cant be on amoving scaffold unless:
Surface is level Height to base ratio is 2 Outriggers are installed
on both sides of scaffolds
Moving Scaffolds
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Scaffolds must
be erected,
moved,
dismantled oraltered under
the supervision
of a competent
person.
Competent Person
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Falls are the leading cause of deaths in the
construction industry.
Falls from as little as 1.5 to 2 m can cause
serious accidents and even death, so must
be protected.
Falls in Construction
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Personal Fall
Arrest System
(PFAS)
Guardrails Safety Net
Fall Protection Options
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PFAS in place before work starts
PFAS in use
Fall Protection Planning
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Must be
independent of
any platformanchorage, able
to support 1140
kg per worker
Safety Line Anchorages
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Top rails about 90 cm tall
Toeboards at least 15 cm high
Top Rail
Mid- Rail
Toeboard
Guardrails
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Place as close as possible, but not more
than 7.5 m below employees working.
Safety Nets
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Unprotected edge
Fall Protection Needed
Unprotected sides must haveguardrails or equivalent
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Fall Protection Needed
This 1/4" nylon rope alone is not a properway to guard this open floor
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Cover completely and securely
If no cover, guard with a guardrail
Fall Protection Needed
Floor Holes
Improperly
Covered
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When working on formwork or rebar
cover or cap protruding rebar
Fall Protection Needed
Concrete Forms and Rebar
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Barricade or fenceexcavations 2 m or
more deep
Fall Protection Needed
Excavations
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If you work on roofs, you must be protected
Fall Protection Needed
Roofs
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Good Work Practice
Perform work at ground level asmuch as possible
Example: building prefab roofs onthe ground and lifting into placewith a crane