![]() The table below shows at what height OSHA's restraint provision (§1926.451(c)(1)) would require the indicated scaffold model, when used with outriggers as described above, to be restrained (by guying, tying, bracing, or equivalent means) to prevent tipping. ![]() Selecting the least dimension provides the following widths: 4-foot scaffold is 4 ft. The addition of your outriggers adds 4 feet to the width and effectively creates a new length for each model. Our analysis shows the base geometry changes on all three models. Since scaffold stability is assessed based on the least dimension and since the nominal length in this scenario becomes the least dimension, maximum unrestrained heights must not exceed four times the nominal length. If (as one example) the user were to add 2-foot outriggers at each corner and perpendicular to the long side of the scaffold base section, the base width dimension would increase to such an extent that it becomes greater than the nominal length. * including vertical posts, guardrails, casters, etc. The table below shows at what height OSHA's restraint provision (§1926.451(c)(1)) would require the indicated scaffold model, when used without outriggers, to be restrained (by guying, tying, bracing, or equivalent means) to prevent tipping. ![]() Use of the scaffolds when no one is on them while they are moved ![]() We will refer to them respectively as the 4-foot, 6-foot and 7-foot models. They are nominally 4 feet long by 26 inches wide, 6 feet long by 29 inches wide, and 7 feet long by 40 inches wide. Your materials describe three "lock-pin" scaffold models. However, in light of the width measurements in your materials, we have calculated the maximum permissible scaffold height for use without restraints. īased on the information you provided, we were unable to calculate the scaffold's total height. a free standing scaffold shall be considered safe when the total height is equal to or less than four times the minimum or least base dimension. OSHA continues to use the relationship between total height and least base dimension to calculate height-to-base width ratio. In 1983, OSHA explained that, for the purposes of the scaffold height-to-base width ratio, the Agency uses the "total height" in relationship to the smaller base dimension. (1) Supported scaffolds with a height to base width ( including outrigger supports, if used) ratio of more than four to one shall be restrained from tipping by guying, tying, bracing, or equivalent means. Section 1926.451(c)(1) states: Criteria for supported scaffolds. However, where appropriate, we try to give some guidance to employers to help them assess whether products are appropriate to use and provide OSHA-required protection. In addition, the variable working conditions at jobsites and possible alterations or misapplications of an otherwise safe product could easily create a hazardous condition beyond the control of the manufacturer. Question: Do the designs that I have submitted regarding "lock-pin" mobile scaffolds meet applicable OSHA construction requirements for height-to-base width ratios for supported scaffolds? 1įirst, please note that OSHA neither approves nor endorses products. I apologize for the delay in our completing this letter. Your inquiry concerns the adequacy of outrigger designs for your "lock-pin" mobile scaffolds used in construction. This is in response to your December 30, 2002, letter to the Occupational Safety and Health Administration (OSHA), as well as several conversations with members of my staff. Stair Podiums The unit is a safe and stable solution for work required on staircases and steps.Re: Whether a mobile scaffold outrigger design meets the requirements of.Stairwell Tower: Height 2.4m The Stairwell Tower is a fantastic solution to all those whom have trouble with access on a staircase.Robust Industrial Extension Ladders All Ladders are manufactured to the NEW EN131-Professional Standard and delivered with Stabiliser Bar Factory Fitted.This industrial extension ladder has virtually no bounce and in our opinion is simply the best ladder in the UK. EN131 Professional Extension Ladders This over engineered ladder was originally designed for the West Coast Fire Brigade.Lift Shaft Towers These towers are highly versatile and allow any lift engineer to work safely on a strong platform at any height.Trade Folding Towers Small compact foldable unit, for ease of mobility, transport and storage.Miniscaff Solo This robust, yet compact system is the perfect system for 1 person’s use.250 Towers With 250mm spacing between the rungs, you have increased flexibility in platform heights.AGR Towers Advanced Guard Rail Towers with a one-piece guardrail that's integral to the build of this mobile tower.3T Industrial Towers BSEN1004 Certified, market-leading tower systems, designed for the professional user.
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