- Is capable of identifying existing and
predictable hazards in the surroundings or working conditions
which are unsanitary, hazardous, or dangerous to employees
and
- Has the authority to take prompt corrective
measures to eliminate them.
Coupler
A device for locking together the tubes
of a tube and coupler scaffold.
Double-pole (independent pole) scaffold
A supported scaffold consisting of
one or more platforms resting on cross beams (bearers) supported
by ledgers and a double row of uprights independent of support
(except ties, guys, braces) from any structure.
Equivalent
Alternative design, material or method
to protect against a hazard. You have to demonstrate it provides
an equal or greater degree of safety for employees than the
method, material or design specified in the rule.
Exposed power lines
Electrical power lines which are accessible
to and may be contacted by employees. Such lines don't include
extension cords or power tool cords.
Eye or eyesplice
A loop at the end of a wire rope.
Fabricated frame scaffold (tubular welded
frame scaffold)
A scaffold consisting of platforms
supported on fabricated frames with integral posts, horizontal
bearers, and intermediate members.
Failure
Load refusal, breaking, or separation
of component parts. Load refusal is the point where the ultimate
strength is exceeded.
Float (ship) scaffold
A suspended scaffold consisting of
a braced platform resting on 2 parallel bearers and hung from
overhead supports by ropes of fixed length.
Form scaffold
A supported scaffold consisting of
a platform supported by brackets attached to formwork.
Guardrail system
A vertical barrier, consisting of,
but not limited to, toprails, midrails, and posts, erected to
prevent employees from falling off a scaffold platform or walkway.
Handrails (ladder stands)
A rail connected to a ladder stand
running parallel to the slope and/or top step.
Hoist
A manual or power-operated mechanical
device to raise or lower a suspended scaffold.
Horse scaffold
A supported scaffold consisting of
a platform supported by construction horses (saw horses). Horse
scaffolds constructed of metal are sometimes known as trestle
scaffolds.
Independent pole scaffold (see double
pole scaffold)
Interior hung scaffold
A suspended scaffold consisting of
a platform suspended from the ceiling or roof structure by fixed
length supports.
Ladder jack scaffold
A supported scaffold consisting of
a platform resting on brackets attached to ladders.
Ladder stand
A mobile, fixed-size, self-supporting
ladder consisting of a wide flat tread ladder in the form of
stairs.
Landing
A platform at the end of a flight of
stairs.
Large area scaffold
A pole scaffold, tube and coupler scaffold,
system scaffold, or fabricated frame scaffold erected over substantially
the entire work area. For example: A scaffold erected over the
entire floor area of a room.
Lean-to scaffold
A supported scaffold which is kept
erect by tilting it toward and resting it against a building
or structure.
Ledger (see runner)
Lifeline
A component consisting of a flexible
line that connects to an anchorage at one end to hang vertically
(vertical lifeline), or that connects to anchorages at both
ends to stretch horizontally (horizontal lifeline). It serves
as a means for connecting other components of a personal fall
arrest system to the anchorage.
Lower levels
Areas below the level where the employee
is located and to which an employee can fall. Such areas include,
but aren't limited to, ground levels, floors, roofs, ramps,
runways, excavations, pits, tanks, materials, water, and equipment.
Masons’ adustable supported scaffold
(see self-contained adjustable scaffold)
Masons’ multi-point adjustable suspension
scaffold
A continuous run suspended scaffold
designed and used for masonry operations.
Maximum intended load
The total load of all persons, equipment,
tools, materials, transmitted loads, and other loads reasonably
anticipated to be applied to a scaffold or scaffold component
at any one time.
Midrail
A rail, approximately midway between
the toprail of a guardrail system and the platform, and secured
to the uprights erected along the exposed sides and ends of
a platform.
Mobile scaffold
Supported scaffold mounted on casters
or wheels.
Multi-level suspended scaffold
A two-point or multi-point adjustable
suspension scaffold with a series of platforms at various levels
resting on common stirrups.
Multi-point adjustable suspension scaffold
A suspended scaffold consisting of
a platform(s) which is suspended by more than 2 ropes from overhead
supports and equipped with means to raise and lower the platform
to desired work levels.
Needle beam scaffold
A suspended scaffold which has a platform
supported by 2 bearers (needle beams)
suspended from overhead supports.
Outrigger
A structural member of a supported
scaffold which increases the base width of a scaffold. This
provides support for and increases the stability of the scaffold.
Outrigger beam (suspended and supported)
The structural member of a suspended
scaffold or outrigger scaffold which provides support for the
scaffold by extending the scaffold point of attachment to a
point out and away from the structure or building.
Outrigger scaffold
A supported scaffold consisting of
a platform resting on outrigger beams which projects beyond
the wall or face of the building or structure. The inboard ends
of the outrigger beams are secured inside the building or structure.
Overhand bricklaying
The process of laying bricks and masonry
so that the surface of the wall is on the opposite side of the
wall from the mason, requiring the mason to lean over the wall
to complete the work. It includes mason tending and electrical
installation incorporated into the brick wall during the overhand
bricklaying process.
Personal fall arrest system
A system used to arrest an employee’s
fall. It consists of an anchorage, connectors, and body harness
and may also include a lanyard, deceleration device, lifeline,
or combinations of these.
Platform
A work surface used in scaffolds, elevated
above lower levels. Platforms can be constructed using individual
wood planks, fabricated planks, fabricated decks, and fabricated
platforms.
Pole scaffold (see single-pole scaffold
and double (independent) pole scaffold)
Pump jack scaffold
A supported scaffold consisting of
a platform supported by vertical poles and movable support brackets.
Qualified Person
A person who has successfully demonstrated
the ability to solve problems relating to the subject matter,
work, or project, either by:
- Possession of a recognized degree, certificate,
or professional standing
or
- Extensive knowledge, training and experience.
Rated load
The manufacturer’s specified
maximum load to be lifted by a hoist or to be applied to a scaffold
or scaffold component.
Repair bracket scaffold
A supported scaffold consisting of
a platform supported by brackets. The brackets are secured in
place around the circumference or perimeter of a chimney, stack,
tank or other supporting structure by one or more wire ropes
placed around the supporting structure.
Roof bracket scaffold
A supported scaffold used on a sloped
roof. It consists of a platform resting on angular-shaped supports
so that the scaffold platform is level.
Runner (ledger)
The lengthwise horizontal spacing or
bracing member which may support the bearers.
Scaffold
A temporary elevated platform, including
its supporting structure and anchorage points, used for supporting
employees or materials.
Self-contained adjustable scaffold
A combination supported and suspended
scaffold consisting of an adjustable platform mounted on an
independent supporting frame, not a part of the object being
worked on, which is equipped with a means to raise and lower
the platform. Such systems include rolling roof rigs, rolling
outrigger systems, and some masons’ adjustable supported
scaffolds.
Shore scaffold
A supported scaffold which is placed
against a building or structure and held in place with props.
Single-point adjustable suspension scaffold
A suspended scaffold consisting of
a platform suspended by one rope from an overhead support and
equipped with means to permit the movement of the platform to
desired work levels.
Single-pole scaffold
A supported scaffold consisting of
platforms resting on bearers, the outside ends of which are
supported on runners secured to a single row of posts or uprights,
and the inner ends of which are supported on or in a structure
or building wall.
Stair tower (scaffold stairway/tower)
A tower comprised of scaffold components
which contains internal stairway units and rest platforms. These
towers are used to provide access to scaffold platforms and
other elevated points such as floors and roofs.
Stall load
The load at which the prime mover of
a power-operated hoist stalls or the power to the prime mover
is automatically disconnected.
Step, platform, and trestle ladder scaffold
A platform resting directly on the
rungs of a step, platform, or trestle ladder.
Stilts
A pair of poles or similar supports
with raised footrests, used to permit walking above the ground
or working surface.
Stonesetters’ multi-point adjustable
suspension scaffold
A continuous run suspended scaffold
designed and used for stonesetters’ operations.
Supported scaffold
One or more platforms supported by
rigid means such as outrigger beams, brackets, poles, legs,
uprights, posts, or frames.
Suspended scaffold
One or more platforms suspended from
an overhead structure by ropes or other non-rigid means.
System scaffold
A scaffold consisting
of posts with fixed connection points that accept runners, bearers,
and diagonals that can be interconnected at predetermined levels.
Toeboard (scaffold)
A barrier erected along the exposed
sides and ends of a scaffold platform at platform level to prevent
material, tools, and other loose objects from falling from the
platform.
Top plate bracket scaffold
A scaffold supported by brackets that
hook over or are attached to the top of a wall. This type of
scaffold is similar to carpenters’ bracket scaffolds and
form scaffolds.
Tube and coupler scaffold
A scaffold consisting of platforms
supported by tubing, erected with coupling devices connecting
uprights, braces, bearers, and runners.
Tubular welded frame scaffold (see fabricated
frame scaffold)
Tubular welded sectional folding scaffold
A sectional, folding metal scaffold
either of ladder frame or inside stairway design. It's substantially
built of prefabricated welded sections, which consist of end
frames, platform frame, inside inclined stairway frame and braces,
or hinged connected diagonal and horizontal braces. It can be
folded into a flat package when the scaffold isn't in use.
Two-point suspension scaffold (swing stage)
A suspended scaffold consisting
of a platform supported by hangers (stirrups), suspended by
2 ropes from overhead supports, and equipped with means to permit
the raising and lowering of the platform to desired work levels.
Unstable objects
Items whose strength, configuration,
or lack of stability may allow them to become dislocated and
shift and therefore may not properly support the loads imposed
on them.
Unstable objects don't constitute a
safe base support for scaffolds, platforms, or employees. Examples
include, but aren't limited to, barrels, boxes, loose brick,
and concrete blocks.
Vertical pickup
A rope used to support the horizontal
rope in a catenary scaffold.
Walkway (scaffold)
Part of a scaffold used only
for access and not as a working level.
Window jack scaffold
A platform resting on a bracket or
jack that projects through a window opening.
Work level
The elevated platform, used for supporting
workers and their materials.
For
printing