Official scaffold study guide Flashcards
What is the scaffold capacity factor?
scaffold must support 4 times the intended load.
on platform scaffolds construction gaps can be….
1” max
The overlap gap for platform must construction must be …….
12” min a supports
no ___ on wooden platforms
paint
Use only ____ grade wood on Platform scaffold construction.
scaffold
Not require to be stamped scaffold grade, and it is up to the competant person to decided if the boards used are safe.
scaffold boards
If platforms/walkways cannot be 18” wide, and if the worker could fall more than 10’ _____.
Then the worker must be protected by guardrails and/or PFAS
What is the scaffold-to-workforce distance?
14” for most operations
What is the scaffold-to-workforce distance for plastering and lathing?
18”
Min. platform overhang is ___ over centerline of support unless cleated or otherwise secured from movement.
6”
If platform is 10’ long or less, max overhang is ___.
12”
If platform overhang is 10’ long or more, max overhang is ___.
18”
Platform overlaps are done to create a long platform, what are the requirements?
- must be over supports, and
2. not less than 12” unless secure to prevent movement.
Scaffold mixed components two requirements:
- must be compatible.
2. Competent person must check it out.
If a scaffold has a height to width ratio that is greater than 4:1, than____.
it must be guyed, tied, or braced.
If a scaffold is greater than 3 feet wide it must be secured every ___, after 4x the base width.
26’
If a scaffold is less than 3 ft. wide it must be secure every __ vertically, after 4x the base width.
20’
If you chose not to secure a scaffold you must either use___ or ___.
- Outriggers
2. widen the base
A designer is required when building scaffolds greater than ___ high, design must be done by a register __.
125’ high, PE
Access must be provided when platforms are greater than ___ above or below a point of access.
2 feet
Ladders bottom rung is __ max ht.
24”
stay __ feet away from power lines.
10 feet
Stay ___ away from insulated power lines less than 300 volts.
3 feet
stay __ away from un-insulated lines and insulated lines greater than 300 volts.
10 feet
If greater than 50 Kv, _______.
stay 10 feet plus .4” per every Kv over 50.
Platforms must not deflect more than__ of span when loaded.
1/60th
Must be on firm surface except concrete, must inspect surfaces first for holes, must lock — scaffolds prior to use.
casters
When using mobile scaffolds apply force load no more than __ above the base when moving scaffolds
5 feet
required to prevent racking or collapse.
Diagonal bracing
When using mobile scaffolds rolling surface is no more than ____ out of level.
3 degrees
When using rolling scaffolds rolling surface must be free from _____.
pits, holes, and obstructions
When using outrigger frames on rolling scaffolds they must be ____.
used on both sides of the scaffold
When using rolling scaffolds no employee on any part of the scaffold should extend beyond the ____.
wheels or casters
When using rolling scaffolds make the employee aware of the ___.
move
Fall protection is required __ when using scaffolds.
10 feet
Use __ and __ on suspension scaffolds.
PFAS and Guardrails
___ and ___ use PFAS where feasible.
Erectors and Dismantlers
Personal fall arrest systems on scaffolds must be attached by lanyard either……..
- to a lifeline (either vertical or horizontal)
2. to a scaffold structural member
According to what osha standard must all scaffolds unless specified by g1 (1)- g1 (vi) have guardrail systems and PFAs that meet the requirements of g4.
1926.451 g (1) (vii)
A top rail on a guard rail system must be how high?
38-45 inches
Guard rails and PFAs are required on all sides, except the sides where ______.
Work is being done
For falling object protection what can be done?
Barricades, screens, nets, and toeboards
If the toe boards are not high enough because the material is stacked too high.
- Use screening from toe board to top rail
- Use canopies or nets to catch falling objects
- Barricade area below
___ should not be used as a crane
man lifts
What are permissible types of loads on man lifts?
personnel, materials, and tools
When are equipment modifications allowed on manlifts?
When you have written consent from the manufacturer and tabulated data from a PE or the manufacturer
employee must stand firmly, not standing or climbing on the edge of the basket.
man basket
No ____ while using lifts. For instance using planks, ladders or other devices.
Jerry rigging
No __ to adjacent structures, while working from lifts.
tying off
Employee on fully extended man lift. Ran over bricks and the boom flexed and sprung.
worker thrown from basket. 37 feet to concrete floor. Employee dead.
The capacity of the rope must be ___ the intended load on suspension scaffolds.
6x
Need the super vision of a ___ for rigging a suspension scaffold.
competent person
When dealing with suspension scaffolds ___ equipment before each shift.
inspect
Suspension scaffold must be tied to a ____ that is capable of supporting 4x the rated load.
Supported system
When dealing with Suspension scaffolds ___ must reach completely to the ground.
Lifelines, cables
Must be attached anchorage points capable of holding 5000 lb.
independent lifelines
No ____ may be used on suspended scaffolds.
fuel powered equipment
Three rules for counter weights.
- non-flowable material
- permanently marked with weight
- securely attached
Causes of a scaffold collapse
- use of screens
- high winds
- poor foundation
Use ___ on swinging loads
Tag lines
Protect suspension ropes from ____.
heat or acid
Which type of man lift requires PFAS. Scissor lifts or boom lifts?
All manlifts
What are the three types of Scaffolds
a. Supported scaffolds
b. Suspended scaffolds
c. Man lifts
- Scaffolding hazards are caused by falls. What are the main reasons a person falls. – can steeve eat pizza under furniture
a. Unsafe access
b. Planking – weak so it gives away
c. Fall protection – lack of
d. Collapse – foundation / structural instability
e. Struck by – falling tools/debris
f. Electrocution – power lines
Competent person: Must be trained: Sandy makes snacks
a. Structural integrity scaffolds
b. Maintenance requirements, and
c. Subpart L, OSHA standard
What are the competent persons responsibilities? –
a. Supervise
b. Train
c. Determine fall protection
d. Inspect
e. Determine of mixed components can be used
What must scaffold training include?
a. Falls
b. Falling object hazards
c. Power lines
d. Scaffold use
e. Scaffold load capacities
In scaffold construction what must be used?
a. Base plates
b. Mud sills must be used in soil or asphalt
c. Casters (May be use don concrete)
User training requirements include:
a. Fall protection
b. Falling object protection
c. Power line hazards
d. Use of scaffolds
e. Handling materials on scaffold
f. Load capacities of scaffolds
Retraining User requirements:
- Change in worksite
- Change in type of scaffold, fall protection
- Observed inadequacies in worker performance
Methods of access:
a. Ladders
b. Ramps and walkways
c. Prefabricated access
d. Direct access
Ladders may not be used to increase working height except when?
a. Ladder is placed against structure other than the scaffold.
b. Ladder legs must be on the same plank, or otherwise stabilized.
c. Scaffold is secured against the force of the ladder.
d. Planks are secured to prevent their movement.
e. Ladder legs are secured to prevent slippage.
If employees use mobile scaffolds:
a. Surface must be level
b. Max height to base is 2:1
c. Outriggers used on both sides
Employees must be trained in PFAS on scaffolds.
a. Anchorage
b. Lifeline
c. Lanyard
d. Body harness
Manlifts requirements:
a. Train operators
b. Keep operators manual near by
c. Inspect equipment prior to use
d. Inspect area above and around
e. Set up – level firm
f. Move when platform is lowered
Suspension scaffolds
.
a. Need competent person for rigging
b. Inspect Equipment before each shift
c. Support system must e tied to sound member that can hold 4x the rated load
d. Lifelines and cables to the ground. Independent lifelines and hoist cables must reach the ground.
