4. Be placed on a firm foundation and be uniformly level within 1 percent of level grade Ladders used to support step, platform, and trestle ladder scaffolds shall be placed, fastened, or equipped with devices to prevent slipping. Scaffold platforms shall not be placed any higher than the second highest rung or step of the ladder supporting the platform. 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 B. Other common components are scaffold boards and edge protection. Hot wires, ungrounded wires that can cause a shock if you touch them, are usually: More than 50 percent of electrocutions are caused by a worker coming in direct contact with: The OSHA standard requires flexible cords to be rated for: What is the most frequent violation of OSHA electrical standards? Ladder Jack Scaffold. Each turnbuckle shall be connected to the other end of its rope by use of an eyesplice thimble of a size appropriate to the turnbuckle to which it is attached. You should have head protection if which of the following apply to your job? Crossbracing shall be installed between the inner and outer sets of poles on double pole scaffolds. D. All of the above. Never sit on, lean against, or step on a skylight lens or any covering placed over a hole in a roof or floor A scaffold must be erected "plumb, square, and level," starting with the first bay of the scaffold, because every degree that the scaffold is off level will be magnified as the scaffold is raised in height. C. Suspended scaffolds As a general rule, a scaffold becomes inherently unstable once its height is four times its minimum base dimension, even if it is plumb and square. To ensure scaffolding safety, the scaffold must be built under the supervision of a competent person; someone who has been thoroughly trained on safe work practices when working on scaffoldings. Do not abuse or misuse the scaffold equipment. Chicken Ladder. List at least three of the four main hazards to which persons working on a Scaffolds and scaffold components shall be designed by a registered professional engineer and shall be constructed and loaded in accordance with such design. Scaffolds shall be constructed in accordance with paragraphs (a), (b), or (c) of this section, as appropriate. Operators must complete three separate aspects of powered industrial truck training: formal training, practice training, and: To adhere to fire safety precautions, flammable and combustible materials must be stored according to: General safety principles that can help reduce workplace accidents include: Material handling tasks should be designed to minimize _________ of the given activity. missing parts due to area obstructions). Acceptable fall protection systems allowed include guardrails, safety nets, safety harnesses , positioning device systems and fall restraint systems. . Personal Fall Arrest System. Vehicles and heavy equipment should always be kept clear of the scaffold base. As an example, even in this day of steel and iron, scaffolds made from ( 2) Diagonal braces shall be installed on all sides of each square. These hooks shall be so placed that they will prevent the platform from falling if one of the horizontal wire ropes breaks. Any man-made cavity, depression, trench or cut in the earths surface formed by earth removal Scaffolds shall be used only for the purpose of working at the window opening through which the jack is placed. The purpose of this survey is: determine the condition of the structure so that measures can be taken, if necessary, to prevent the premature collapse of any portion of the structure. Platforms shall not extend outward beyond the base supports of the scaffold unless outrigger frames or equivalent devices are used to ensure stability. Smith, Michael Abbott, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. Faults: Damaged. Platforms shall not be more than 36 inches (0.9 m) wide unless designed by a qualified person to prevent unstable conditions. The scaffold is usually constructed from aluminium or steel tubes and clips, with timber or metal scaffold planks used to form a secure and level working platform. Folding type metal brackets, when extended for use, shall be either bolted or secured with a locking-type pin. 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. Tap here to review the details. Scaffold platforms must be fully decked or planked. The upper tiers shall stand on a continuous row of planks laid across the next lower tier, and shall be nailed down or otherwise secured to prevent displacement. The use of gray cast iron is prohibited. On scaffolds whose length is less than their height, such bracing shall be installed from the base of the end posts upward to the opposite end posts, and then in alternating directions until reaching the top of the scaffold. Find a more appropriate tool that doesnt cause debris to fly uses. Employers must provide employees with effective information and training on hazardous chemicals in their work area: At the time of their initial assignment. sawhorses; others are much more complex, such as the scaffolds erected hundreds of . If bridges are not used, passage may be made from one platform to another only when the platforms are at the same height and are abutting. Couplers shall be of a structural metal, such as drop-forged steel, malleable iron, or structural grade aluminum. An employee may wear stilts on a scaffold only if it is a large area scaffold. If the hoist tower is not enclosed, the hoist platform or car must be totally enclosed on all sides for the full height between the floor and: The greatest hazards posed by hand tools result from: Power tools should never be carried by the cord or hose or be yanked from a receptacle by the cord or hose; and cords and hoses should be kept away from: Sharp, abrasive, pinching, or otherwise hazardous moving parts of power tools: Must have protective guard to prevent contact with workers. 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 Add lukewarm water to two plastic cups. Secure access to the scaffold. Frequently used types of scaffolds include the Plumb and level the scaffold as it is being erected. The knowledgeable user knows how to select the right scaffold for the The scaffold assembly must be designed to comply with Local, State and Federal safety requirements. Safe access above 2 feet. Scaffold levels used only as a walkway must have what, planking or decking at least 18 inches wide or fall protection must be provided and used, Before builders can permit the use of a scaffold what must be done, Fall protection systems and falling object protection must be installed on any scaffold more than 10 feet above a lower level, The most effective protection to shield employees from falling objects is, Installing debris nets, canopies, and screens, Whats the definition of a Supported scaffold. . Plumb and brace poles, legs, posts, frames, and uprights to prevent swaying and displacement. Click here to review the details. . The two steps for avoiding hazards that are always taken before the need for PPE is considered are: The three main scaffold types are aerial lifts, supported scaffolds and: Because using cranes or derricks to hoist personnel poses a serious risk to the employees being lifted, any cranes and derricks that hoist personnel must: Be placed on a firm foundation and be uniformly level within 1 percent of level grade. Other requirements are listed Scaffolds must be designed by a professional engineer in the following situations: Supported scaffolds exceeding: fifteen metres in height above their base support; or Before a scaffold is moved, each employee on the scaffold shall be made aware of the move. Not tied. Every degree that the scaffold is off leveled will be magnified as the scaffold is raised in height. Knowing Scaffolding is not to be erected, moved, dismantled or altered unless supervised by a . All vertical joints of the scaffold are attached and secured by bolts and nuts or other fastening devices of adequate strength; b. Caster stems and wheel stems shall be pinned or otherwise secured in scaffold legs or adjustment screws. A ground-fault circuit interrupter (GFCI) protects workers from shock by: Matching the amount of current going into an electrical device against the amount returning from the device and shutting down power if a ground fault is detected. Before the start of each work shift, it is mandatory that: A competent person inspects the scaffold before the start of each work shift. Employees working in the vicinity of a crane must take care to avoid what kind of accident? Runners shall be interlocked on straight runs to form continuous lengths, and shall be coupled to each post. We've encountered a problem, please try again. Uplift might be caused by the action of wind on a secured deck or by the leverage action of a cantilever side bracket on the scaffold. Correct answer Special care and training incentives If bearing on rungs only, the bearing area shall include a length of at least 10 inches (25.4 cm) on each rung. All ladders used to support ladder jack scaffolds shall meet the requirements of subpart X of this part -- Stairways and Ladders, except that job-made ladders shall not be used to support ladder jack scaffolds. True or False: Once a fall protection device has been inspected by a competent person and deemed safe for use by an employee, it is up to the employee to inspect it regularly and ensure that it still meets OSHA requirements. D. Friendly weightlifting competitions among workers to build strength. Ladders used to support ladder jacks shall be placed, fastened, or equipped with devices to prevent slipping. Mechanical demolition refers to demolition using equipment like: A. Wrecking balls or jackhammers B. The sheaves of all blocks shall fit the size of the rope used. has financial rewards, with an estimated annual savings of $90 million for American 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. By the user only b. Plumb c. By a contractor d. Plumb and level e. Level c Safe rigging practice dictates that weight estimates of objects to be lifted, when the objects are relatively lightweight, should be accurate within plus or minus _____. Do not erect, dismantle or alter a scaffold unless under the supervision of a competent person. Scaffold erection shall progress in only one direction around any structure. Answer: Those who ( sell or) rent it many times have calculator app or XLS file for it to do that math. Is this an exothermic or endothermic process? A scaffold should always be erected: Choose one answer. 1. By whitelisting SlideShare on your ad-blocker, you are supporting our community of content creators. which of the following statements is false? When guardrails are used for fall protection, a workbench may be used as the toprail only if it meets all the requirements in paragraphs (g)(4)(ii), (vii), (viii), and (xiii) of 1926.451. Scaffolds constructed of tube and coupler components shall also comply with the requirements of paragraph (b) of this section; Scaffolds constructed of fabricated frame components shall also comply with the requirements of paragraph (c) of this section. Scaffolds shall be braced by cross, horizontal, or diagonal braces, or combination thereof, to prevent racking or collapse of the scaffold and to secure vertical members together laterally so as to automatically square and align the vertical members. a scaffold must be erected plumb, square and level because [, A space of at least 3 inches between handrails, or stair rails used as handrails, and other objects. Non-mandatory Appendix A to this subpart contains examples of criteria that will enable an employer to comply with design and loading requirements for pole scaffolds under 60 feet in height. and that cross braces are of such length as will automatically keep the scaffold plumb, level, and square. "Fabricated frame scaffolds" (tubular welded frame scaffolds). ( 1) Scaffolds made of wood shall be reinforced with gussets on both sides of each corner. SCAFFOLDS MUST BE ERECTED IN ACCORDANCE WITH DESIGN AND/OR MANUFACTURERS' RECOMMENDATIONS. 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. 7. The following requirements do not apply to two-point adjustable suspension scaffolds used as masons' or stonesetters' scaffolds. Using scaffolds properly can help prevent workplace accidents and injuries. 2. Wooden bracket-form scaffolds shall be an integral part of the form panel. Scaffolds are commonly used in construction work so that workers have a safe, stable platform on which to work when work cannot be done at ground level or on a finished floor. Manual force used to move the scaffold shall be applied as close to the base as practicable, but not more than 5 feet (1.5 m) above the supporting surface. Choose one answer posts, frames, and shall be of a crane must take to... Grade aluminum ladder supporting the platform from falling if one of the ladder supporting the platform falling! 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