03 scaffolding osha
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OSHA OUTREACH SAFETY TRAINING
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What Is A Scaffold?
An elevated, temporary work platform
Three basic types:
Supported scaffolds -- platforms
supported by rigid, load bearingmembers, such as poles, legs, frames, &
outriggers
Suspended scaffolds -- platforms
suspended by ropes or other non-rigid,
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 f all prot ection St ruck by f alling t ools / debris
Elect rocution from overheadpower lines
Scaffold collapse - caused by
instabilit y or overloading Bad planking giving way
Employees working on scaffolds areexposed t o these hazards:
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: 25 .
: 50 ).(
: 75 .
)(
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Wood Scaffolds
Frame Scaffolds
:Tube and Clamp :Modular System Scaffolds.
:Rolling Scaffolds
:Suspended Scaffolds
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Frame Scaffolds
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Frame Scaffold
OSHA refers to frame
scaffolds as sectional steel
scaffold.
There are two basic partsto a frame scaffolds The
frame and the cross brace.
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Tube and Clamp
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Modular System Scaffolds
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Rolling Scaffolds
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Suspended Scaffolds
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6 .
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. 4:1 4
.
.
30 (overlapping) 15
.
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. . 6
. 10 )3 (
. 10 )3
( . )4(
26 30 .
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.
.
.
Mudsill 9
2 10
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Scaffold Support Examples
Good supportInadequate support
in danger of collapse?
Baseplate
Mud sills
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Bracing
.
.
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6
6 .
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TIES
.
4 26 30 .
4 26 .
50% .
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Securing1926.451(c)(ii)
If the base width is wider than 3,
the first tie will be a vertical
distance of 4 times that (from theground), and every 26 thereafter.
Example:
base width = 5 first vertical tie will be (5 x 4) 20
from the ground
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Securing1926.451(c)(ii)
Guys, ties, and braces shall be installed at
each end of the scaffold and at horizontal
intervals not to exceed 30.
For example, on thisscaffolding which
extends the lengthof the hotel,
horizontal braceswill be installed at
the red marks.
x x x x x30· <30· <30· 30·
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Through Ties (+ ve)
Reveal Ties (- ve)
Box Ties (+ ve)
Anchor Bolt (+ ve)
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1- Through Ties (+ ve)
) (
.
.
³ ´
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Reveal Ties
) (
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Box Ties
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Anchor Bolt
800 1200 1600 )
(
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2 10
10 8 6 .
6
12 .
1
Toe Board 4
)10 ( 18 )45 (
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No large gaps in front edgeof platforms
Each abutted end of plank
must rest on a separatesupport surface
Overlap platforms at least12 inches over supports,unless restrained to
prevent movement
Scaffold PlatformConstruction
Planks not properlyoverlapped
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Platform Ends
Each end of a plat form, unless
cleat ed or otherwiserest rained by hooks,must ext end over its support by at least 6
inches
No Cleats
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Scaffold Inspection
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Scaffold Labeling
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