Scaffolds2

Scaffolds : 

OSHA Office of Training & Education 1 Scaffolds

What Is A Scaffold? : 

OSHA Office of Training & Education 2 What Is A Scaffold? An elevated, temporary work platform Three basic types: Supported scaffolds -- platforms supported by rigid, load bearing members, 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”

Hazards : 

OSHA Office of Training & Education 3 Hazards Falls from elevation – caused by slipping, unsafe access, and the lack of fall protection Struck by falling tools / debris Electrocution – from overhead power lines Scaffold collapse - caused by instability or overloading Bad planking giving way Employees working on scaffolds are exposed to these hazards:

Fall Hazards : 

OSHA Office of Training & Education 4 Fall Hazards While climbing on or off the scaffold Working on unguarded scaffold platforms When scaffold platforms or planks fail Falls may occur:

Protecting Workers from Falls : 

OSHA Office of Training & Education 5 Protecting Workers from Falls Guardrails, and/or Personal Fall Arrest Systems (PFAS) If a worker on a scaffold can fall more than 10 feet, protect them by:

Slide 6: 

OSHA Office of Training & Education 6 Install along open sides & ends Front edge of platforms not more than 14 inches from the work, unless using guardrails and/or PFAS Top rails - 38 to 45 inches tall Midrails halfway between toprail and platform Toeboards at least 3-1/2 inches high Guardrails

Slide 7: 

OSHA Office of Training & Education 7 Personal Fall Arrest Systems (PFAS) You must be trained how to properly use PFAS PFAS include anchorage, lifeline and body harness.

Slide 8: 

OSHA Office of Training & Education 8 Can use PFAS instead of guardrails on some scaffolds Use PFAS & guardrails on suspension scaffolds Use PFAS on erectors and dismantlers where feasible Fall Protection Requirements The ends of this scaffold are not properly guarded

Falling Object Protection : 

OSHA Office of Training & Education 9 Falling Object Protection Wear hardhats Barricade area below scaffold to forbid entry into that area Use panels or screens if material is stacked higher than the toeboard Build a canopy or erect a net below the scaffold that will contain or deflect falling objects

Overhead Power Lines : 

OSHA Office of Training & Education 10 Overhead Power Lines The possibility of electrocution is a serious consideration when working near overhead power lines Check the clearance distances listed in the standard

Scaffold Support Examples : 

OSHA Office of Training & Education 11 Scaffold Support Examples Good support Inadequate support – in danger of collapse? Base plate Mud sills

Slide 12: 

OSHA Office of Training & Education 12 Essential Elements of Safe Scaffold Construction Use appropriate scaffold construction methods Proper scaffold access Properly use a competent person

Scaffold Platform Construction : 

OSHA Office of Training & Education 13 Scaffold Platform Construction Platforms must: be fully planked or decked with no more than 1 inch gaps be able to support its weight & 4 times maximum load be at least 18 inches wide This is not a properly constructed scaffold

Slide 14: 

OSHA Office of Training & Education 14 No large gaps in front edge of platforms Each abutted end of plank must rest on a separate support surface Overlap platforms at least 12 inches over supports, unless restrained to prevent movement Scaffold Platform Construction Planks not properly overlapped

Scaffold Platform Construction : 

OSHA Office of Training & Education 15 Scaffold Platform Construction No paint on wood platforms Use scaffold grade wood Fully planked between front upright and guardrail support Component pieces used must match and be of the same type Erect on stable and level ground Lock wheels and braces

Scaffold Height : 

OSHA Office of Training & Education 16 Scaffold Height The height of the scaffold should not be more than four times its minimum base dimension unless guys, ties, or braces are used 20’ 5’

Slide 17: 

OSHA Office of Training & Education 17 Platform Ends Each end of a platform, unless cleated or otherwise restrained by hooks, must extend over its support by at least 6 inches No Cleats

Supported Scaffolds : 

OSHA Office of Training & Education 18 Supported Scaffolds Platforms supported by legs, outrigger beams, brackets, poles, uprights, posts, & frames Restrain from tipping by guys, ties, or braces Scaffold poles, legs, posts, frames, and uprights must be on base plates and mud sills or other firm foundation This support is not adequate!

Proper Scaffold Access : 

OSHA Office of Training & Education 19 Proper Scaffold Access Provide access when scaffold platforms are more than 2 feet above or below a point of access Permitted types of access: Ladders, such as portable, hook-on, attachable, stairway type, and built-ins Stair towers Ramps and walkways May use building stairs and come out window

Scaffold Access : 

OSHA Office of Training & Education 20 Scaffold Access No access by crossbraces When using ladders, bottom rung no more than 24 inches high Can use some end frames Can access from another scaffold, structure or hoist End Frame Do not access by crossbraces

Suspension Scaffolds : 

OSHA Office of Training & Education 21 Suspension Scaffolds Train employees to recognize hazards Secure/tie to prevent swaying Support devices must rest on surfaces that can support four times the load Competent person: evaluate connections to ensure the supporting surfaces can support load inspect ropes for defects before shift PFAS must have anchors independent of the scaffold support system Platforms suspended by ropes or wires. Rope must be capable of supporting 6 times the load

Slide 22: 

OSHA Office of Training & Education 22 Moving Scaffolds Employees can’t be on a moving scaffold unless: Surface is level Height to base ratio is 2 to 1 Outriggers are installed on both sides of scaffolds Employees can’t be on scaffold part beyond the wheels Competent person must be on site to supervise

Slide 23: 

OSHA Office of Training & Education 23 Fatal Fact – Moving a Lift Employee was operating an aerial lift, with an extendable boom rotating work platform The boom was fully extended and the machine apparently ran over some bricks, causing the boom to flex or spring, throwing the employee from the basket The employee fell 37 feet to a concrete surface

Slide 24: 

OSHA Office of Training & Education 24 Don’t use Shore or Lean-to Scaffolds Shore scaffold supported scaffold which is placed against a building or structure and held in place with props Lean-to scaffold supported scaffold which is kept erect by tilting it toward and resting it against a building or structure

Using Scaffolds : 

OSHA Office of Training & Education 25 Using Scaffolds Don’t work on snow or ice covered platforms or during storms or high winds Use tag lines on swinging loads Protect suspension ropes from heat & acid A covered scaffold has special wind load considerations

Slide 26: 

OSHA Office of Training & Education 26 Fatal Fact – Ice & No Guardrails Laborer was working on the third level of a tubular welded frame scaffold which was covered with ice and snow The scaffold was not fully decked, there was no guardrail and no access ladder The worker slipped and fell head first 20 feet to the pavement below

Overhand Bricklayingfrom Supported Scaffolds : 

OSHA Office of Training & Education 27 Overhand Bricklayingfrom Supported Scaffolds A guardrail or personal fall arrest system is required on all sides except the side where the work is being done

Competent Person : 

OSHA Office of Training & Education 28 Competent Person Person capable of identifying and promptly correcting hazards Determines if it’s safe to work on a scaffold during storms or high winds Trains workers to recognize hazards Selects qualified workers to conduct work

Scaffold Inspection : 

OSHA Office of Training & Education 29 Scaffold Inspection Competent person inspects scaffolds for visible defects before each shift and after any alterations Defective parts must be immediately repaired Deformed bearer

Scaffold Erection : 

OSHA Office of Training & Education 30 Scaffold Erection Scaffolds can only be erected, moved, dismantled or altered under the supervision of a competent person Competent person selects & directs these workers and determines the feasibility of fall protection

Training Requirements : 

OSHA Office of Training & Education 31 Training Requirements Train employees on scaffold hazards and procedures to control the hazards The training must include: Nature of electrical, fall, and falling object hazards How to deal with electrical hazards and fall protection systems Proper use of the scaffold Scaffold load capacities Retrain as necessary

Training Erectors : 

OSHA Office of Training & Education 32 Training Erectors Train employees involved in erecting, disassembling, moving, operating, repairing, maintaining, or inspecting a scaffold to recognize its hazards and the correct procedures to use

Avoid the Main Hazards of Scaffolds : 

OSHA Office of Training & Education 33 Avoid the Main Hazards of Scaffolds Falls from elevation Bad planking Scaffold collapse Getting struck by falling tools or debris Electrocution

Summary : 

OSHA Office of Training & Education 34 Summary Use appropriate scaffold construction methods Erect, move, or alter scaffold properly Protect from falling objects or tools Ensure stable access Use a competent person Train on scaffold construction and the hazards involved with scaffolds Inspect scaffold before each shift and after alterations Determine fall protection requirements Remember to: