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: A. 4. Knowledge of the basic anatomy of the spine, muscles, and joints of the trunk Scaffolds and components must be able to support at least four times the intended load. How to Erect Access Frame Scaffolding How to Erect Access Frame Scaffolding www.worksafebc.com Select . 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. The use of gray cast iron is prohibited. Remote detonators to implode a structure Scaffolds shall not exceed three tiers in height, and shall be so constructed and arranged that one square rests directly above the other. The ladder must extend 1 m (3 ft.) above the landing. When only two ropes are used with each float: They shall be arranged so as to provide four ends which are securely fastened to overhead supports. Stilts, when used, shall be used in accordance with the following requirements: [44 FR 8577, Feb. 9, 1979; 44 FR 20940. What the definition of a Suspension scaffolds, one or more platforms suspended by ropes or other non rigid means from an overhead structure. The ropes shall be securely attached to the needle beams. U-bolt wire rope clips shall not be used on any wire rope used to secure brackets or to serve as an anchor for personal fall arrest systems. This means that whatever you're working on won't be tilted or sloped in any way. A scaffold is a temporary structure erected to support access or working platforms. The frames must be plumb and level and spaced to adequately support the loads. 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. Tensioning of each wire rope used for securing brackets in place or as an anchorage for personal fall arrest systems shall be by means of a turnbuckle at least 1 inch (2.54 cm) in diameter, or by equivalent means. Faults: Damaged. It provides a safe and stable platform for workers. When platforms are being moved to the next level, the existing platform shall be left undisturbed until the new bearers have been set in place and braced prior to receiving the new platforms. D. Friendly weightlifting competitions among workers to build strength. By definition a scaffold is a temporary, elevated platform If bearing on rungs only, the bearing area shall include a length of at least 10 inches (25.4 cm) on each rung. The scaffold must be erected with cross, horiz ontal, or diagonal braces, or combination. B. Place suitable sills and make sure there are no holes under the sills. 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. Non-cross-laminated wood boatswains' chairs shall be reinforced on their underside by cleats securely fastened to prevent the board from splitting. The original scaffold layout is still feasible. ", "Form scaffolds and carpenters' bracket scaffolds. A scaffold should always be erected: Choose one answer. Electricity travels in closed circuits, and its normal route is through a conductor. 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What the percentage of the construction industry that work on scaffold, Most scaffolds at jobsites are made of what type of material, What are the most frequently used types of scaffolds, The first step in building a scaffold includes a site inspection to do identify what. Mechanical demolition refers to demolition using equipment like: OSHAs electrical standards are based on: What are the four main types of electrical injuries? Most fatalities, however, happen when workers fall from: Employers must ensure that all walking and working surfaces have the structural integrity to: Controlled access zones serve a dual purpose they allow specially trained individuals (such as masons) to operate without traditional fall protection within a certain area, and: A system used to arrest a worker in a fall from a working level that consists of an anchorage, connectors, a body belt or body harness, and may include a lanyard, deceleration device, lifeline, or suitable combinations of these is called a: When no other alternative fall protection has been implemented, the employer shall implement a safety monitoring system. Catenary Scoffold. 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. aluminum, or less commonly, wood. Scaffolds, once properly erected, are a control measure to prevent the risk of persons and objects falling when working at height. Unsafe scaffolding has the potential to result in death or serious . Platforms shall not be more than 36 inches (0.9 m) wide unless designed by a qualified person to prevent unstable conditions. The platform shall be securely fastened to hangers (stirrups) by U-bolts or by other means which satisfy the requirements of 1926.451(a). Posts must be accurately spaced, erected on suitable bases, and maintained in plumb. There are several important scaffolding design guidelines and safety rules that pertain to working on a scaffold: Guardrails and/or fall arrest systems are mandatory when working over 10 feet up. C. Both A and B For example, if lumber is used, it must be construction grade or Number 1 Grade spruce. 6. Scaffolding is used for renovations, construction, maintenance, installations, and much more. Poles shall be secured to the structure by rigid triangular bracing or equivalent at the bottom, top, and other points as necessary. Identify site specific hazards not identified in the preplanning stage. Bearers shall be installed transversely between posts, and when coupled to the posts, shall have the inboard coupler bear directly on the runner coupler. Frames and panels shall be joined together vertically by coupling or stacking pins or equivalent means. Protect themselves by wearing the proper PPE Couplers shall be of a structural metal, such as drop-forged steel, malleable iron, or structural grade aluminum. 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. Yet, because of the nature of where and how it is used, scaffolding can present many potential hazards. Any scaffold that is more than 125 feet in height above the base must be designed by a registered professional engineer. Chicken Ladder. The circuit becomes part of the conductor Which of the following is an element of a hearing conservation program? D. Armed robots. "Plasterers', decorators', and large area scaffolds." Ropes or hangers shall be used for supports, except that one end of a needle beam scaffold may be supported by a permanent structural member. [3] Lift the planks through the scaffold bars and into place. Scaffolds must be plumb, level, and squared. 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. It appears that you have an ad-blocker running. The body becomes part of the circuit Be placed on a firm foundation and be uniformly level within 1 percent of level grade Scaffolding must not be placed on unstable objects, such as bricks or blocks. The use of safe lifting postures and timing Frequently used types of scaffolds include the 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. Truck-mounted and rough terrain cranes are both forms of a mobile crane, and both use which of the following to increase their stability? Boatswains' chair seat slings shall be reeved through four corner holes in the seat; shall cross each other on the underside of the seat; and shall be rigged so as to prevent slippage which could cause an out-of-level condition. Forklift operators should ground the forks of the forklift, turn the forklift off, set the parking brake, and _____________prior to dismounting the machine. Guardrails should be between 38" and 45" high. Ray ID: 7a19bde4e8771d14 D. Stop using the tool, A. job, and he shouldhis life depends on it. 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. Correct answer Special care and training incentives feet in the air to build skyscrapers or repair monuments like the Statue of Liberty. 1. Where leveling of the scaffold is necessary, screw jacks or equivalent means shall be used. The site owner may have set restrictions that prevent you from accessing the site. Why do we characterize the heat conduction ability of insulators in terms of their apparent thermal conductivity instead of the ordinary thermal conductivity? An estimated 2.3 million construction workers, or 65 percent of the construction industry, 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. Scaffolds must be constructed of suitable structural materials. Make sure a proper access is provided. Warped. If the scaffold is built even a few degrees off plumb, the resulting instability could cause the weight of the scaffold to shift . When only a part of the width of the metal scaffold frame conforms to ladder spacing, then these frames must be erected in a manner that makes a continuous ladder bottom to top, with ladder sides of the frames in a vertical line. which of the following statements is false? Splice plates of other materials of equivalent strength may be used. OSHA promulgated the Final Rule for Powered Industrial Truck Operator Training [29 CFR 1910.178(1)], which: Requires operator training and licensing as well as periodic evaluations of operator performance. These rules were combined under the umbrella of OSHA. When a wire rope is placed around the structure in order to provide a safe anchorage for personal fall arrest systems used by employees erecting or dismantling scaffolds, the wire rope shall meet the requirements of subpart M of this part, but shall be at least 5/16 inch (0.8 cm) in diameter. Review the foundation. Specific requirements are described below. Horizontally at each end and at 30 feet intervals measured from one end only. Not tied. Prior to starting all demolition operations, OSHA 1926.850 (a) requires that an engineering survey of the structure be conducted by a competent person. Activate your 30 day free trialto unlock unlimited reading. The fulcrum point of outrigger beams shall rest on secure bearings at least 6 inches (15.2 cm) in each horizontal dimension. Light metal-type platforms having a rated capacity of 750 pounds or less and platforms 40 feet (12.2 m) or less in length shall be tested and listed by a nationally recognized testing laboratory. Select the equipment you need and place it near the work area. ERECTED SCAFFOLDS SHOULD BE CONTINUALLY INSPECTED by users to be sure that they are maintained in safe condition. 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. 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 Prevent An Expressway Emergency By Merging Without _____. Move the personnel platform slowly and cautiously and have a rotation-resistant rope with a safety factor of 10 A scaffold is a temporary structure specifically erected to support access or working platforms. As an example, even in this day of steel and iron, scaffolds made from Install a suitable means of access, such as a sloping or vertical ladder secured to the scaffold at the landing point. Apr. Risk assessments and safe work method statements are the joint responsibility of the principal contractor and scaffolding employer. Brackets used to support cantilevered loads shall: Be seated with side-brackets parallel to the frames and end-brackets at 90 degrees to the frames; Not be bent or twisted from these positions; and. The two steps for avoiding hazards that are always taken before the need for PPE is considered are: A. Be supported by bearing blocks securely attached to the poles. 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 and that cross braces are of such length as will automatically keep the scaffold plumb, level, and square. 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