Ladders And Platforms Flashcards
What are the 3 basic types of ladders?
Stepladders
Straight ladders
Extension ladders
What are the 3 materials ladders are constructed from?
Fibreglass
Wood
Aluminum
What are the benefits of aluminum ladders?
Lightweight
Corrosion resistant
What are the benefits of wood ladders?
Heavier
Sturdier
What are the benefits of fibreglass ladders?
Very durable
Can handle some rough treatment
What ladder grades are used in industry?
1
I
Or IA
What is the minimum required overlap for a 11m extension ladder?
1m
What is the minimum required overlap for a 15-22m extension ladder?
1.5m
How much should a ladder project above the level of landing to which it provides access?
1m (3ft)
What is the slope ratio for extension ladders?
4:1
(Every 4m up, 1m out)
What classification of ladders may be used for construction purposes?
Grade 1
What is the correct incline ratio of an extension ladder resting against a building?
4:1
What is the name of the hinged arms between the two sections of a stepladder?
Spreaders
On what step of a step ladder must a worker not stand to work?
Top two steps
What type of protective finish can be used on a wooden ladder?
Clear finish
What type of ladder is free standing?
Step ladder
What is the centre to centre spacing of the cleats on a single ladder?
300mm (10”)
What is the minimum size for the side rail of a 3M (10ft) job built single ladder?
38 x 89mm (2x4”)
How does the length of the extension ladder affect the overlap?
Longer the ladder = more overlap
What are the 4 basic types of scaffolding?
Job built wooden
Job built tube and clamp
Manufactured all round system
Manufactured welded steel frame
Why are all round system scaffolding systems used?
Allows the scaffold installer to build any size or shape without separate fittings or loose parts
When are tube and clamp scaffolds useful?
Useful on sloping ground and situations where fixed frame scaffold systems can’t be used
When are Jon built wooden scaffolds used?
When the area to which access is required is close to the ground.
Useful on sloping ground
Or when steel frame cannot be used
How high can wooden scaffolds be?
15m (50ft)
What are the two types of wooden scaffolds?
Single pole
Double pole
What is the difference between single and double pole wooden scaffolds?
Single - light duty
Double - heavy (and can be used for light)
Where are welded steel frame scaffolds commonly used?
Construction sites.
What are the two main parts to welded steel frame scaffolds
End frame
Cross brace
How are welded steel frame scaffold that are more than one unit high secured to each other?
Locking coupler pins
How high does a scaffold need to be to require a guardrail?
3M (10ft)
At what height does steel scaffolds need to be secured to a building?
6.4m (21ft)
If a steel scaffolds require to be secured to the building where does the first attachment connect?
Within 3x the minimum base dimension
(Usually 4.6m or 15ft)
When steel scaffolds need to be secured to a building what is the spacing of the attachments AFTER the first one?
Every 6m (20ft)
How can you prevent the vertical legs of scaffolds from sinking into a soft surface?
Mud sills
How much must lumber planks extend beyond the supports of scaffolding?
150mm (6in)
But no more than 300mm (12in)
At what height must a free standing scaffold be tied off to prevent tipping?
3 times the minimum base dimension
