Scaffold classes and duties (cals)
description
Transcript of Scaffold classes and duties (cals)
Outcomes;
Calculate scaffold quantities
Identify scaffold duties
Calculate Live and dead loads
Calculate lengths of sole boards
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
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
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
Hight of scaffold
Steel Aluminium
Up to 15m 4 3
Up to 30m 3 2
Up to 45m 2 1
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
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.
Full weight ½ weight ¼ weight
Adjustable base plate
Standards
Ledger
Transom
Bracing
Planks
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
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
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
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
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
Do all variations of calculations from
Assessment Instrument
OVER AND OVER!!!!!OVER AND OVER!!!!!
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: _________________________________
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