SECTION 6: Supported Scaffolds
Currently the University uses five types of supported scaffolds.
A detailed analysis with scaffold specific regulations and tips is
located in the individual scaffold section, Appendix
A.
A supported scaffold is defined as a scaffold consisting of one or
more platforms
supported
by outrigger beams,
brackets, poles, legs, uprights, posts, frames, or similar rigid
support.
Base Section (top)
Scaffolds must be built on a level foundation. In order to assure
stability scaffolds must be built on base plates, mudsills, or
a comparable adequate firm foundation.
Footings must be capable of supporting the loaded scaffold without
settling or displacement. Unstable objects may not be used to support
scaffold or platform unit.
Tractors, vehicles, or construction equipment cannot be used to
support scaffolds unless they have been designed to do so. Forklifts
shall
not be used to support scaffold platforms unless, the entire
platform is attached to the fork, and the forklift is not moved horizontally
while the platform is occupied.
Support Structures (top)
Support structures such as poles, frames, uprights, and
etc. must be braced to prevent swaying and displacement.
Bracing
Frames and panels must be connected by cross, horizontal, or diagonal
braces, alone or in combination, which secure vertical members
together laterally.
As frames are stacked, cross braces must be of such length as will
automatically keep the scaffold level, and square, and all brace
connections must be secured to prevent dislodging.
Pinning
Frames and panels must be joined together vertically by coupling
or stacking pins or a comparable equivalent means.
Frames and panels must be locked together to prevent separation
of the panel from the frame below it.
Components
Scaffold components may not be intermixed unless they fit together
with out force, and a competent person has determine the structure
is still sound.
Stability (top)
When a supported scaffold reaches a height greater than four times
its minimum base (4:1), it must be restrained from tipping by guys,
ties, or braces. Guys, ties, and braces must be installed at locations
where horizontal scaffold components support both inner and outer
legs. Ties, guys, braces, or outriggers shall be used to prevent
tipping of supported scaffolds bearing eccentric loads, such as
cantilevered work platforms.
Guys, ties, and braces must be installed according to the manufacturer's
recommendations or at the closest horizontal member and be repeated
every 20 vertical feet for narrow scaffolds, 3 feet or less in width,
and every 26 vertical feet for wider scaffolds, 3 feet or greater
in width.
Inspection
The competent person must inspect scaffolds for visible defects before
each shift, and after any occurrence that could affect a scaffold's
structural integrity.
Any part of a scaffold damaged or weakened so that it no longer
meets OSHA’s strength requirements must be repaired, replaced,
braced, or removed from service.
Moving
Scaffolds may not be moved while employees are on them unless they
have been designed for that purpose by a registered professional
engineer.
Weather
Employees are not permitted to work on or from a scaffold during
storms or high wind, unless a competent person has determined that
it is safe, and those employees are protected by a personal fall
arrest systems, or wind screens. When windscreens are used the
scaffold must be secured against the anticipated wind forces.
Fall Protection (top)
Each employee on a scaffold more than 10 feet above a lower level
must be protected from falling to that lower level. Fall protection
consists of either personal fall arrest systems or guardrail systems.
Employees performing overhand bricklaying operations from a supported
scaffold must be protected from falling from all open sides and
ends of the scaffold, except at the side next to the wall being
laid.
 Section
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