Scaffold classes and duties (cals)

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Scaffold classes and duties (cals)

  1. 1. Outcomes; Calculate scaffold quantities Identify scaffold duties Calculate Live and dead loads Calculate lengths of sole boards
  2. 2. Scaffold Minimum Bay Maximum Bay Max hightclass Size Size of lift Length Width Length WidthLight 0.45m 0.45m 3.0m 2.4m 2.0m 2 boards 10 boardsMedium 0.9m 0.9m 2.4m 1.8m 2.0m 3 or 4 8 boards boardsHeavy 1.0m 1.0m 1.8m 1.275m 2.0m 5 boards
  3. 3. 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 workMedium 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/renderersHeavy 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
  4. 4. Scaffold Max load Per Max concentratedClass Platform per load Per Platform per Bay Bay (Should be over transom)Light 225kg 100kgMedium 450kg 150kgHeavy 675kg 200kg
  5. 5. Hight of Steel Aluminium scaffoldUp to 15m 4 3Up to 30m 3 2Up to 45m 2 1
  6. 6. Total Dead load for scaffold = 1060kg Add up all components in the scaffold. or = 1.06 Tonne 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
  7. 7. 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.
  8. 8. Full weight ½ weight ¼ weightAdjustable Ledger Planksbase plate TransomStandards Bracing
  9. 9. Quantity Weight AdjustedComponent Length Weight A A AStandard 2.0m 12kgStandard 3.0m 18kgTransom 1.2m 8kgLedger/guard rail 2.4m 10kgBrace end (1.2 bay) 2.0m 10kgBrace face (2.4bay) 3.6m 17kgCaptive plank (225mm) 1.2m 10kgCaptive plank (225mm) 2.4m 20kgLadder access putlog/transom 1.2m 8kgAdjustable base plate 750mm 7kgLadder 4m 20kg total dead load A
  10. 10. Quantity Weight AdjustedComponent Length Weight A A AStandard 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 plate 750mm 7kg 1  7  7 Ladder 4m 20kg -      total dead load A 131.5  Total Dead load for leg B = 99.5kg
  11. 11. 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
  12. 12. 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
  13. 13. Live Load = 300kgDead Load = 131.5kgBearing Pressure=2.4 TonneWidth 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
  14. 14. Do all variations of calculations from Assessment InstrumentOVER AND OVER!!!!!
  15. 15. Great Heights Scaffold Company Number: 9991 HANDOVER CERTIFICATEEach 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: _________________________________
  16. 16. Great Heights Scaffold Company Number: 9991 HANDOVER CERTIFICATEEach 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

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