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Working ConditionsĮmployees shall be prohibited from working on scaffolds covered with snow, ice, or other slippery material (ex. For clearance distances for insulated and uninsulated power lines, click here. Clearances apply to the tools and equipment being used in the vicinity of the power lines, materials being handled, any scaffolding component, and any part of a person's body. When working or erecting scaffolding in the vicinity of overhead electrical lines, it is critical that minimum clearances be observed and/or that power lines are de-energized or insulated by the power company. If the bowing of the board under the weight applied to the plank exceeds two inches, the scaffold is overloaded. 120 inches multiplied by 1/60 equals 2 inches maximum deflection. Example 3: A scaffold has a plank that rests on supports 10 feet apart (i.e.The deflection is measured with a tape measure and a straight edge. Platforms, planks, or decking must not deflect more than 1/60 of the span when loaded.
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A light-duty scaffold would therefore be adequate for the anticipated work described in Example 1 above.Ī simple method to determine if a scaffold is overloaded is the Deflection Method. Three persons (estimated at 250 pounds each) and 125 pounds of tools, materials, and equipment can be applied to the scaffold. Multiply 35 square feet by 25 pounds per square foot and the scaffolding can be loaded with no more than 875 pounds. The type of scaffolding being used is rated as light-duty, or 25 pounds per square foot. Example 2: The scaffold size is 7 feet long by 5 feet wide - a total square footage of 35 square feet.25 psf, 50 psf, or 75 psf, multiplied by the square footage of the scaffold work surface. The maximum weight that can be applied to the scaffold is determined by data supplied by the manufacturer, expressed as permissible load per square feet (e.g. The rated load capacity of a scaffold is defined below.
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Scaffold and scaffold components shall not be loaded in excess of their maximum intended load or rated capacity, whichever is less. The scaffolding selected must be able to withstand this load (the safety factor of four is designed into the rated load capacity). Example 1: The work to be performed will require two persons (250 pounds each), 10 pounds of hand tools, and 50 pounds of materials, for a total of 560 pounds.(Persons are estimated at 250 pounds each.) To figure the maximum intended load, total the weight of all persons, equipment, tools, materials, transmitted loads, and other loads reasonably anticipated to be applied to the scaffold (or scaffold component) at any one time. Will pedestrians be affected? Building accesses must be maintained and overhead protection may be required.Įach scaffold and scaffold component shall be capable of supporting, without failure, its own weight and at least four times the maximum intended load applied or transmitted to the scaffold.How high will the scaffolding be and will it need to be secured to the building structure or designed by a qualified person?.What are the site conditions? Will the scaffolding be set up on a concrete foundation, pavement/asphalt, or earth? If set up on earth, what class of soil is present and is the area level? Are there weather conditions to consider?.What will be the intended use of the scaffolding? Consider what work tasks will be performed, anticipated loads for people, materials, and equipment, any unique building configurations which may create a problem, and electrical or piping obstructions which are in the area.When preparing for work involving scaffolding, it is important to consider the following: Shore scaffolds are placed against a building or structure and are held in place with props. Lean-to scaffolds are supported by tilting it toward and resting upon a building or structure.
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#A FRAME SCAFFOLDING DESIGN CALCULATION PROFESSIONAL#
Scaffolds that will be greater than 125 feet in height above their base plates must be designed by a registered professional engineer (i.e.