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OSHA Office of Training & Education
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صفحه 22:
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30 همتاهءد۵ظ عک وصتهنع؟ ؟ه م0856 05۸
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همتاهءد۵ظ عک وصتهنع؟ ؟ه م0856 05۸
Stairways and Ladders
OSHA Office of Training & Education
1
Hazards
• Stairways and ladders cause
many injuries and fatalities among
construction workers
• About half the injuries caused by
slips, trips and falls from ladders
and stairways require time off the
job
Improper use of the top rung
of a step ladder
OSHA Office of Training & Education
2
Slips, Trips and Falls
On Stairways and Ladders
At the end of this training, you should be able to list or
describe:
•
Safety guidelines and requirements for stairways
used at a construction site
•
Safe practices and requirements for ladders
used at a construction site
OSHA Office of Training & Education
3
Stairway or Ladder
There must be a stairway or ladder at points of access where
there is an elevation break of 19 inches or more.
At least one point of access must be kept clear.
Break in elevation
19 inches
OSHA Office of Training & Education
4
Handrail vs. Stairrail
Stairrail
System
Handrail
OSHA Office of Training & Education
5
Handrail and
Top Rail Strength
Rails must be able to
withstand a force of
200 pounds
OSHA Office of Training & Education
6
Handrails
Stairways with four or
more risers, or higher than
30 inches, must be
equipped with at least one
handrail.
The stairway to this platform has more than 4 risers
and is not guarded. The platform requires guarding.
OSHA Office of Training & Education
7
Stairrails
Stairways with four or
more risers or more than
30 inches high must have a
stairrail along each
unprotected side or edge.
OSHA Office of Training & Education
8
Stairs
Install between 30 and
50 degrees.
Must have uniform riser
height and tread depth,
with less than a 1/4-inch
variation.
if
n
U
o rm
-
30
&
50
deg
ngl
a
.
e
No more than 1/4 inch
variation in any stairway system
OSHA Office of Training & Education
9
Temporary Stairways
Only use pan stairs if
filled with filler material
at least to the top edge
of each pan.
Pan
OSHA Office of Training & Education
10
Stairway Landings
Stairways landings must be at
least 30 inches deep and 22
inches wide at every 12 feet or
less of vertical rise
Landing
Unprotected sides of landings
must have standard 42 inch
guardrail systems
OSHA Office of Training & Education
11
Platforms and Swing Doors
Where doors or gates open
directly on a stairway, provide a
platform that extends at least 20
inches beyond the swing of the
door.
OSHA Office of Training & Education
12
Dangerous Conditions
Fix slippery conditions before
using.
Stairway parts must be free of
projections which may cause
injuries or snag clothing.
OSHA Office of Training & Education
13
Ladders
OSHA Office of Training & Education
14
General Ladder Requirements
Ladders must be kept in a safe condition
-- DO –
Keep the area around the top and bottom of a
ladder clear
Ensure rungs, cleats, and steps are level and
uniformly spaced
Ensure rungs are spaced 10 to 14 inches apart
Keep ladders free from slipping hazards
OSHA Office of Training & Education
15
General Ladder Requirements
Use ladders only for their designed purpose
-- DON’T –
Tie ladders together to make longer sections,
unless designed for such use
Use single rail ladders
Load ladders beyond the maximum load for
which they were built, nor beyond the
manufacturer’s rated capacity
OSHA Office of Training & Education
16
Securing Ladders
• Secure ladders to prevent
accidental movement due to
workplace activity
This ladder is not
on a stable
surface
• Only use ladders on stable and level
surfaces, unless secured
• Do not use ladders on slippery
surfaces unless secured or
provided with slip-resistant feet
OSHA Office of Training & Education
17
Portable Ladders
Inspect before use for cracks,
dents, and missing rungs
Design or treat rungs to minimize
slipping
Side rails -- at least 11 1/2 inches
apart
Must support 4 times the maximum
load
OSHA Office of Training & Education
18
Double - Cleated Ladder
Use a double-cleated ladder (
with center rail) or 2 or
more ladders:
when ladders are the only
way to enter or exit a working
area with 25 or more
employees
when a ladder will serve
simultaneous two-way traffic
OSHA Office of Training & Education
19
Painting Wood Ladders
Don’t paint ladders
Don’t use an opaque
covering (like varnish)
on a wood ladder
OSHA Office of Training & Education
20
Ladder Angle
Non-self-supporting ladders:
(which lean against a wall or other
support)
Position at an angle where the
horizontal distance from the top
support to the foot of the ladder
is 1/4 the working length of the
ladder
OSHA Office of Training & Education
21
Ladder Rail Extension
When using a portable ladder
for access to an upper
landing surface, the side rails
must extend at least 3 feet
above the upper landing
surface
OSHA Office of Training & Education
22
Tall Fixed Ladder Requirements
Equip a fixed ladder 24 feet or longer
with either a:
• Ladder safety device
• Self-retracting lifelines with rest
platforms every 150 feet or less
• Cage or well, and multiple ladder
sections, each section not exceeding 50
feet
OSHA Office of Training & Education
23
Near Energized Electrical Equipment
If using ladders where the
employee or the ladder could
contact exposed energized
electrical equipment, they must
have nonconductive siderails
such as wood or fiberglass.
This is an unsafe condition
OSHA Office of Training & Education
24
Top Step
Do not use the top or top
step of a stepladder as a
step
OSHA Office of Training & Education
25
Crossbracing
On this ladder the back rungs
are designed for use
Don’t use crossbracing
on the rear of a
stepladder for climbing unless the ladder is
designed for that
OSHA Office of Training & Education
26
Damaged or Defective Ladders
A competent person must inspect
ladders for visible defects, like
broken or missing rungs
If a defective ladder is found,
immediately mark it defective or
tag it "Do Not Use”
Missing rung
Withdraw defective ladders
from service until repaired
OSHA Office of Training & Education
27
Climbing the Ladder
Face the ladder when going up
or down
Use at least one hand to grab
the ladder when going up or
down
Do not carry any object or load
that could cause you to lose
balance
OSHA Office of Training & Education
28
Training
A competent person must train each employee in the
following areas, as applicable:
• The nature of fall hazards in the work area
• The correct procedures for erecting,
maintaining, and disassembling the fall
protection systems to be used
• The proper construction, use, placement, and care in
handling of all stairways and ladders
• The maximum intended load-carrying capacities of
ladders
OSHA Office of Training & Education
29
Summary
Key Components for Stairway Safety
• Treads
• Rails
handrails
stairrails
guardrails
• Landings and Platforms
OSHA Office of Training & Education
30
Summary
Key Components for Ladder Safety
• A competent person must inspect
• Use the correct ladder for the job
• Use the correct angle, supports, treads, cross
braces and rails
• Don’t overload
• Your employer must train you in proper use of a
ladder
OSHA Office of Training & Education
31