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Supported Scaffolds. Scaffold User Training. 9% of construction deaths are scaffold-related Scaffold falls injure 29,000 workers every year. 47% of all scaffold catastrophes and deaths are caused by - PowerPoint PPT Presentation
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Supported Scaffolds
Scaffold User Training
9% of construction deaths are scaffold-related Scaffold falls injure 29,000
workers every year. 47% of all scaffold catastrophes
and deaths are caused by
defective scaffolds. Any missing or defective part
makes a scaffold less safe.
The danger of falling is most common.
Scaffold Hazards
Ladders and Scaffolds
1926.450 Subpart L - Scaffolds 1926.450: Scope, application and
definitions 1926.451: General requirements
– Covers the basic variables 1926.452: Specific requirements
– For each type of scaffold 1926.453: Aerial lifts 1926.454: Training
– Anyone who works from a scaffold or who erects scaffolds must have training.
Ladders and Scaffolds 15X & L
Supported scaffolds must have these
features:
How Do We Know a Scaffold Is Safe?
.451 General RequirementsFor All Scaffolds
(a) Capacity– Support its own weight and 4 X the
Maximum Intended Load (MIL).
– .
– Designed by a Qualified Person and built and loaded to design.
– Some Criteria listed in Appendix 'A'
Ladders and Scaffolds 17SUBPARTS
X & L
(b) Platform Construction
Platforms fully planked or decked
Maximum 1” gaps
Maximum openings of 9½” if necessary
Platforms and walkways minimum 18” wide Ladder jack, top plate bracket, roof bracket,
and pump jack scaffold at least 12” wide Guardrails and/or Personal Fall Arrest
System (PFAS) for < 18” wide
Ladders and Scaffolds 20SUBPARTS
X & L
Fully planked with scaffold-grade wood or metal.
What Makes a Safe Platform?
Ladders and Scaffolds 21SUBPARTS
X & L
(b) Platform Construction4
Don’t paint wood, except ID on edges Fully planked between front upright &
guardrails Don’t mix scaffold components used unless
compatible & strength is maintained [Competent Person decision]
Don’t modify mixed scaffold components to make them fit [C.P. decision] No components of dissimilar metals without
Competent Person approval
Ladders and Scaffolds 27SUBPARTS
X & L
This 6-tier scaffold is is anchored to the building with rope through windows.
A solid strut anchor is better, especially if not dependent upon friction attachments at both ends.
Ladders and Scaffolds 30X & LSUBPARTS
Tie-Ins to the Building
You can visually check scaffold alignment.
Plumb:Vertical members stand perpendicular to horizon.
Level:Horizontal members are parallel to horizon.
Square:Horizontal and vertical members form right angles where they connect.
Plumb, Level, Square
Ladders and Scaffolds 34X & LSUBPARTS
Ladders and Scaffolds 35SUBPARTS
X & L
Foundation and Load Distribution?
Distribute loads evenly. Point load over uprights.
Evenly distributed –
A good practice!
Point Loading - When necessary, it should be done over uprights.
An unsafe practice!
What’s the Best Way to Load the Scaffold?
Ladders and Scaffolds 37SUBPARTS
X & L
.451(e) Access Must have safe access
– No access by cross braces– Bottom rung not more than 24” high– From other surface if within 14" H, 24" V– Rest platforms at 35’ intervals– Safe access for erectors/dismantlers
• Competent Person Decision• 22" Horizontals OK for Builders
Some end frames can be used for access.
Ladders and ScaffoldsSUBPARTS
38X & L
(f) USE3
No makeshift devices to increase height– The 'Drywall Bucket Rule'
No ladder to increase height except on 'large area' and:– Side thrust countered, platform secured
– Ladder legs on same platform & secured Platforms not to deflect > 1/60 of span
Ladders and ScaffoldsX & LSUBPARTS
47
Your employer must train you.
.454 Training Requirements
Ladders and ScaffoldsX & LSUBPARTS
73
Required at 10 foot height PFAS instead of guardrails on some Fall protection required when scaffold is
greater than 14” away from work surface PFAS for erectors/dismantlers where
feasible Toprails height = 38” to 45” Crossbracing ‘X’ as top or midrail
depending on height
.451(g) Fall Protection
Ladders and ScaffoldsX & LSUBPARTS
48
Guardrails prevent work falls.
─ Ideal height is 38 inches above work platform.
─ OSHA requires fall protection on platforms 10 feet or higher.
Top rail must withstand a force of 200 pounds (or 100 pounds on suspension scaffolds).
Only 33% of the scaffolds involved in accidents had guardrails.
Guardrails
Ladders and ScaffoldsX & LSUBPARTS
49
(h) Falling Object Protection
Hardhats required Protect employees below Barricades to exclude working below Toe boards at edges of platforms Allows panels and screens Canopies allowed
Ladders and ScaffoldsX & LSUBPARTS
53
Using extra planks on edge:– Wire in place– Maintain max. gap of ¼"– Wire or nail ends in place
Job-made w/1"x 6" lumber:
– Wire/nail/cleat in place
– Lighter, easier to handle
Ladders and ScaffoldsX & LSUBPARTS
54
Toeboard Options
Scaffolds shall remain a minimum of 10 feet away from energized power lines.
All power tools and equipment shall be plugged into a GFCI
Temporary lighting shall not be connected to the scaffold system by metal components
Ladders and ScaffoldsX & LSUBPARTS
54
Electrical Hazards
Mobile Scaffolds3
Plumb; Level square; Braces secured Cross, horizontal & diagonal braces to
prevent racking or collapse Mobile scaffolds must comply with other
frame requirements Castors - positive lock on wheel and/or
swivel Force to move no more than 5 feet above
base
Ladders and ScaffoldsX & LSUBPARTS
58
Ladders and ScaffoldsSUBPARTS
59
Horizontal and diagonal bracing required to prevent “racking”.
Most manufacturers provide with fixed length.
.452(w) Mobile Scaffolds2
X & L
Mobile Scaffolds4
No platforms beyond base unless outriggers or equivalent for stability
Screwjacks or equivalent to level
Castor stems pinned or bolted
Make workers aware before moving
Ladders and ScaffoldsSUBPARTS
60X & L
Mobile Scaffolds4
Stabilize to prevent tipping when moving No riding unless:
– Surface within 30 of level; no obstructions– Height: base width ratio = 2:1 or designed– Outriggers, if used, on both sides– No extensions beyond supports– Power used < 1 foot/second
Ladders and ScaffoldsX & LSUBPARTS
61
Don’t allow tools, materials, or debris to collect on scaffold.
Never, never throw or drop tools, materials, or equipment.
Make sure connections are in place and completely tight.
Do not stand on ties. Do not stand on guardrails or plank
extensions. Do not overreach outside of the guardrails.
Protect Yourself With Good Practice
Ladders and ScaffoldsSUBPARTS
71X & L
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