Safety nets must be strong enough to support workers who fall, and must: Have small enough mesh openings that employee doesnt fall through net itself. Damaged or deteriorated equipment must not be used USA (v. 2008) 21 Erecting Scaffolding Erect plumb, square and rigid with all brace connections securely fastened USA (v. 2008) 22 Tubular Welded-frame Scaffolds Be sure scaffold stays plumb and level as erection progresses For mobile scaffolds, use a horizontal diagonal brace, for A metal base plate footing makes the scaffold more secure and will go a long way to ensure scaffolding meets the next two regulations. D. All of the above. SCAFFOLDS MUST BE ERECTED IN ACCORDANCE WITH DESIGN AND/OR MANUFACTURERS' RECOMMENDATIONS. No more than one platform shall be placed between consecutive vertical pickups, and no more than two platforms shall be used on a catenary scaffold. Some simple scaffolds are little more than planks and guardrails over two Hard hats must be worn by all persons erecting, moving, dismantling or using scaffolding. Suspension scaffold rigging must at least 6 times the intended load. Scaffolds and scaffold components shall be designed by a registered professional engineer and shall be constructed and loaded in accordance with such design. Any part of a building or structure used to support the scaffold shall be capable of supporting the maximum intended load to be applied. When nails are not used, brackets shall be secured in place with first-grade manila rope of at least three-fourth inch (1.9 cm) diameter, or equivalent. Scaffold platforms shall not be bridged one to another. Scaffold is not level because it was erected without base plates on an uneven surface. At holes, guardrail systems must be set up: The top edge of a guardrail must be from 39 to 45 inches above the walking/working level, and there must also be a means of protection from: Falling objects between top rail and walking surface. A good time to perform these inspections is at the start of the workday to ensure the area is clear for that day's shift. The ropes shall be securely attached to the needle beams. [3] Lift the planks through the scaffold bars and into place. Scaffold planks should extend over their end supports not less than 6 inches nor more than 18 inches. PLUMB/LEVEL/SQUARE. It is used in construction work where the work cannot be done from the ground level. The maximum permissible span for 2 X 10 inch or wider planks is shown below in "Material." . Clipping is a handy way to collect important slides you want to go back to later. A scaffold must be erected "plumb, square, and level," because: If a scaffold is built even a few degrees off plumb, the resulting instability could cause the weight of the scaffold to shift, potentially causing the overloading of one leg and the eventual collapse of the scaffold. A. SCAFFOLD BASE MUST BE SET ON AN ADEQUATE SILL OR PAD to prevent slipping or sinking and fixed thereto where required. Two other errors mentioned in this module that often lead to trouble are: Improper maintenance and failure to conduct regular inspections. Knowledge of the basic anatomy of the spine, muscles, and joints of the trunk The blocks for fiber or synthetic ropes shall consist of at least one double and one single block. Wooden bracket-form scaffolds shall be an integral part of the form panel. General. Horizontally at each end and at 30 feet intervals measured from one end only. Scaffolding, also called scaffold or staging, is a temporary structure used to support a work crew and materials to aid in the construction, maintenance and repair of buildings, bridges and all other man-made structures.Scaffolds are widely used on site to get access to heights and areas that would be otherwise hard to get to. Scaffolds must be constructed of suitable structural materials. Scaffolds shall be suspended only from the roof structure or other structural member such as ceiling beams. Each bearer shall be securely fastened to the platform. The sheaves of all blocks shall fit the size of the rope used. Forklifts, trucks, similar motor vehicles or add-on motors shall not be used to propel scaffolds unless the scaffold is designed for such propulsion systems. Engineering and Administrative Controls. Scaffolds shall be securely attached to the window opening. Pole scaffolds over 60 feet in height shall be designed by a registered professional engineer, and shall be constructed and loaded in accordance with that design. Symptoms of silicosis ____________ , so workers should have a chest x-ray to see if there is lung damage. A scaffold must be erected "plumb, square, and level," because: Answer: If a scaffold is built even a few degrees off plumb, the resulting instability could cause the weight of the scaffold to shift, potentially causing the overloading of one leg and the eventual collapse of the scaffold No modifications or additions that affect the capacity or safe operation of a crane or derrick should ever be made without: The manufacturers written approval, which should be kept on file. Scaffolding in this Guide means the individual components, for example tubes, couplers As mentioned in this module, in addition to cave-ins and related hazards, workers involved in excavation work also are exposed to hazards involving: Falls, falling loads and mobile equipment. The frames must be plumb and level and spaced to adequately support the loads. ( 1) Scaffolds made of wood shall be reinforced with gussets on both sides of each corner. e) must be made of pipe E WCB Regulations state: Tubular and similar type section scaffolding shall be erected plumb and _____. When dismantling a scaffold, all work should be conducted: Tube and coupler scaffolds over 125 feet high must be designed by: What type of scaffold other than the tube and coupler scaffold is ideal for use around complex structures? Scaffolds shall be plumb, level, and squared. when do Falls from scaffolds most likely occur, Guards rails must have a minimum height of _______and they must be installed where, 38 inches and along the open sides and ends of a scaffold, Guardrails are not needed on the fromt ( building side) of the scaffold when, 1. the front end of all platforms is less than 14 inches from the face of the work The scaffold must be erected on adequate soleplates and the foundation on which the soleplates are placed must have the sufficient bearing capacity to support the imposed loads transferred from the scaffold. prevented every year. Catenary Scoffold. Not tied. Scaffold casters and wheels shall be locked with positive wheel and/or wheel and swivel locks, or equivalent means, to prevent movement of the scaffold while the scaffold is used in a stationary manner. Scaffold 0c8be2a1 9996-490a-99c0-6ef40baed98a. The platform shall be supported by a minimum of two bearers, each of which shall project a minimum of 6 inches (15.2 cm) beyond the platform on both sides. All ladders used in conjunction with step, platform and trestle ladder scaffolds shall meet the pertinent requirements of subpart X of this part -- Stairways and Ladders, except that job-made ladders shall not be used to support such scaffolds. 9. The poles, legs, or uprights of scaffolds must be plumb, and securely and rigidly braced to prevent swaying and displacement. D. Rope-ladder scaffolds. When two or more scaffolds are used they shall not be bridged one to another unless they are designed to be bridged, the bridge connections are articulated, and the hoists are properly sized. Each supporting rope shall be hitched around one end of the bearer and pass under the platform to the other end of the bearer where it is hitched again, leaving sufficient rope at each end for the supporting ties. An estimated 2.3 million construction workers, or 65 percent of the construction industry, Vehicle mounted devices such as cherry pickers or boot trucks used to get a worker to an elevated position. Prior to starting all demolition operations, OSHA 1926.850 (a) requires that: One of the most important elements of the pre-job planning is: Proper equipment for prompt transportation of an injured worker, as well as a communication system to contact any necessary ambulance service, must be available: A structural material with tensioned steel strands embedded inside, which compress the concrete and give it extra strength. All brace connections shall be secured. Power systems used to propel mobile scaffolds shall be designed for such use. Nothing should lean in any direction. missing parts due to area obstructions). The ladder jack shall be so designed and constructed that it will bear on the side rails and ladder rungs or on the ladder rungs alone. Frequently used types of scaffolds include the Wire ropes shall be continuous and without splices between anchors. Platforms shall not be more than 36 inches (0.9 m) wide unless designed by a qualified person to prevent unstable conditions. A narrow excavation made below the surface of the ground in which the depth is greater than the width with the width not to exceed 15 feet A scaffold is a temporary structure that supports access or working platforms. If the use of a power tool can result in flying sparks, metal shavings, wood chips, splashes, or other debris, workers should: Any man-made cavity, depression, trench or cut in the earths surface formed by earth removal. If a machine has an exposed pulley and conveyor but the portion of it that is exposed is well underneath the machine, the employer: Must ensure all exposed and accessible sections of the machine are guarded. Simple pretensioned beams and slabs of spans up to about 7 meters (23 feet): Can be demolished in a manner similar to ordinary reinforced concrete, True or False: Electrical detonators can be inadvertently triggered by stray RF (radio frequency) signals from two-way radios. work on scaffolds frequently. 2. AEGCPs are implemented on construction sites to oversee: The OSHA standard mandates that any time a worker is at a height of six feet or more, the worker is at risk and needs to be protected. DO NOT ERECT, DISMANTLE OR ALTER A SCAFFOLD unless under the supervision of a qualified person. Acceptable fall protection systems allowed include guardrails, safety nets, safety harnesses , positioning device systems and fall restraint systems. Scaffolds shall be suspended from metal outriggers, brackets, wire rope slings, hooks, or means that meet equivalent criteria (e.g., strength, durability). Step 1 Select and prepare the ground area. Rope connections shall be such that the platform cannot shift or slip. A scaffold must be erected "plumb, square, and level," because: If a scaffold is built even a few degrees off plumb, the resulting instability could cause the weight of the scaffold to shift, potentially causing the overloading of one leg and the eventual collapse of the scaffold Save my name, email, and website in this browser for the next time I comment. Instant access to millions of ebooks, audiobooks, magazines, podcasts and more. On scaffolds whose length is greater than their height, such bracing shall be repeated beginning at least at every fifth post. The cross braces shall be of such length as will automatically square and align vertical members so that the erected scaffold is always plumb, level, and square. In addition to the applicable requirements of 1926.451, the following requirements apply to the specific types of scaffolds indicated. Scaffolds shall not be bridged one to another. 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