scaffold classes and duties (cals)

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Page 1: Scaffold classes and duties (cals)
Page 2: Scaffold classes and duties (cals)

Outcomes;

Calculate scaffold quantities

Identify scaffold duties

Calculate Live and dead loads

Calculate lengths of sole boards

Page 3: Scaffold classes and duties (cals)
Page 4: Scaffold classes and duties (cals)

Scaffold class

Minimum Bay Size

Length Width

Maximum Bay Size

Length Width

Max hight of

lift

Light 0.45m 0.45m

2 boards

3.0m 2.4m10

boards

2.0m

Medium 0.9m 0.9m3 or 4 boards

2.4m 1.8m8 boards

2.0m

Heavy 1.0m 1.0m 1.8m 1.275m5 boards

2.0m

Page 5: Scaffold classes and duties (cals)

Light duty – Minimum access through a scaffold. For persons with hand tools only. Live load maximum 225kg per platform per bay. Maximum concentrated load per platform per

bay 100kg.

Used mainly by: Electricians Painters Window cleaners Light maintenance work

Medium duty – For persons with materials and hand tools.Live load maximum 450kg per platform per bay. Maximum concentrated load per platform per

bay 150kg.

Used mainly by: Carpenters Welders Glaziers Plasterers/renderers

Heavy duty – For trades like brick layers and demolition contractors.Live load maximum 675kg per platform per bay. Maximum concentrated load per platform per

bay 200kg.

Used mainly by: Brick layers Stone masons Demolition work

Page 6: Scaffold classes and duties (cals)

Scaffold Class

Max load Per Platform per Bay

Max concentrated load Per Platform per Bay(Should be over transom)

Light 225kg 100kg

Medium 450kg 150kg

Heavy 675kg 200kg

Page 7: Scaffold classes and duties (cals)

Hight of scaffold

Steel Aluminium

Up to 15m 4 3

Up to 30m 3 2

Up to 45m 2 1

Page 8: Scaffold classes and duties (cals)
Page 9: Scaffold classes and duties (cals)

Add up all components in the scaffold.

To find total Dead Load multiply the quantity of the components by there known weight. Then add all the components weights together to give a total Dead Load.

Eg. Two 2 meters standards weigh 12kg each 2 x 12 = 24kg

Total Dead load for scaffold = 1060kg

or = 1.06 Tonne

Page 10: Scaffold classes and duties (cals)

Dead load is the weight of the scaffold itself and it’s accessories used to construct it.

To calculate the Dead Load of the scaffold at any one point, you must:

1.Calculate the quantity of scaffold that bears down at one point.

2.Multiply the quantity by the weight of each component.

3.Adjust the weight by finding the percentage of weight that is transferred to that one point.

Page 11: Scaffold classes and duties (cals)

Full weight ½ weight ¼ weight

Adjustable base plate

Standards

Ledger

Transom

Bracing

Planks

Page 12: Scaffold classes and duties (cals)

ComponentLengt

hWeigh

tQuantity A

Weight A

Adjusted A

Standard 2.0m 12kg

Standard 3.0m 18kg

Transom 1.2m 8kg

Ledger/guard rail 2.4m 10kg

Brace end (1.2 bay) 2.0m 10kg

Brace face (2.4bay) 3.6m 17kg

Captive plank (225mm) 1.2m 10kg

Captive plank (225mm) 2.4m 20kg

Ladder access putlog/transom 1.2m 8kg

Adjustable base plate750m

m 7kg

Ladder 4m 20kg

total dead load A

Page 13: Scaffold classes and duties (cals)

ComponentLengt

hWeigh

tQuantit

y AWeight

AAdjuste

d A

Standard 2.0m 12kg  -    

Standard 3.0m 18kg  1 18  18 

Transom 1.2m 8kg  2 16 ÷2 8 

Ledger/guard rail 2.4m 10kg  8 80 ÷2 40 

Brace end (1.2 bay) 2.0m 10kg  -    

Brace face (2.4bay) 3.6m 17kg 1  17 ÷2 8.5 

Captive plank (225mm) 1.2m 10kg -     

Captive plank (225mm) 2.4m 20kg 10  200 ÷4  50 

Ladder access putlog/transom 1.2m 8kg -     

Adjustable base plate750m

m 7kg 1  7  7 

Ladder 4m 20kg -     

total dead load A 131.5 

Total Dead load for leg Total Dead load for leg B = B = 99.5kg99.5kg

Page 14: Scaffold classes and duties (cals)

The live load is the total amount of weight allowed on the scaffold that includes persons plus materials for each platform in each bay.

To calculate the live load on one standard, we assume that each standard in that bay will only support a third of the live load of that bay. This allows for uneven distribution of the load across the working platform.

Live load = 225Kg for a light duty scaffold per working platform.

450Kg for a medium duty scaffold per working platform.

675Kg for a heavy duty scaffold per working platform.

Live Load x No. of working platforms supported by the standard ÷ 3 Live load Leg A Medium Duty

=300kg

Page 15: Scaffold classes and duties (cals)

Soleboards are designed to distribute the weight of the scaffold evenly over the surface the scaffold is to be erected on.

The size of the soleboard is dependent on the bearing pressure of the ground. Bearing pressure will be supplied to you by an engineer in kg per m².

(LL) (DL)Live load + Dead load Bearing pressure ÷ Width of Soleboard = Minimum

(BP) soleboards length

Page 16: Scaffold classes and duties (cals)

Live Load = 300kg

Dead Load = 131.5kg

Bearing Pressure=2.4 Tonne

Width of Sole Board=225mm

LOST = LL+DL ÷ WOS = Length of Sole Board

(Length of sole board) BP

300kg+131.5kg ÷ 0.225 =0.799

2400kg

= 0.80m, 80cm or 800mm

Page 17: Scaffold classes and duties (cals)

Do all variations of calculations from

Assessment Instrument

OVER AND OVER!!!!!OVER AND OVER!!!!!

Page 18: Scaffold classes and duties (cals)
Page 19: Scaffold classes and duties (cals)

Great Heights Scaffold Company Number: 9991

HANDOVER CERTIFICATE Each of the following must be completed by the responsible scaffolder:1. Client: ________________________________________________________ 2. Site address: ____________________________________________________3. Scaffold location: ________________________________________________4. Type of scaffold: Tube & coupler / Frame / Tower-frame / Modular / Other

(Circle the appropriate type.)5. Number of working platforms: ______________________________________ 6. Duty category of working platforms; Light / Medium / Heavy / Special

(Circle the appropriate type.)7. Number of lifts above base lift: _____________________________________8. Scaffold height: _________________________________________________9. Number of bays long: _____________________________________________10. Scaffold length: _________________________________________________11. Type of access: Ladder / Stair / Ramp / Other(Circle the appropriate type.)12. Design drawing reference: ________________________________________13. Date of handover: _______________________________________________14. Time of handover: _______________________________________________15. Name of responsible scaffolder: ____________________________________16. Signature of responsible scaffolder: _________________________________

Page 20: Scaffold classes and duties (cals)

Great Heights Scaffold Company Number: 9991

HANDOVER CERTIFICATE Each of the following must be completed by the responsible scaffolder:1. Client: Slap It Up Constructions2. Site address: 1001 sea View Street, Wollongong, NSW3. Scaffold location: West Face of Building4. Type of scaffold: Tube & coupler / Frame / Tower-frame / Modular /

Other5. Number of working platforms: One6. Duty category of working platforms; Light / Medium / Heavy / Special7. Number of lifts above base lift: Six8. Scaffold height: 12 meters9. Number of bays long: Ten10. Scaffold length: 24 meters11. Type of access: Ladder / Stair / Ramp / Other12. Design drawing reference: TA / 123413. Date of handover: Today’s Date Day/Month/Year14. Time of handover: Now AM or PM or 24 hour15. Name of responsible scaffolder: You16. Signature of responsible scaffolder: Yours