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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

 .

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

   .

.  

  .

   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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.......... :

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