In addition to this human savings, working safely on scaffolds also Where uplift can occur which would displace scaffold end frames or panels, the frames or panels shall be locked together vertically by pins or equivalent means. Chicken Ladder. Posts must be accurately spaced, erected on suitable bases, and maintained in plumb. Diagonal bracing in both directions shall be installed across the entire outside face of all double- and single-pole scaffolds. Brackets (including those provided with pointed metal projections) shall be anchored in place by nails unless it is impractical to use nails. work on scaffolds frequently. Resist penetration by objects and absorb the shock of a blow. Click here to review the details. Scaffolding by UWM 1. D. Static electricity gathers outside the circuit. When horses are arranged in tiers, each tier shall be crossbraced. Then a few days before the scaff o l d materials are delivered, make a final jobsite check for the following items. 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. All brace connections must be secured. Extreme weather or damage to structural components can also affect a scaffold's stability. Screw jacks must be used to level scaffolding on uneven surfaces with a maximum extension for a screw jack of 12 inches. 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. Frequently used types of scaffolds include the The scaffold must be erected and used in accordance with OSHA regulations. Move the scaffold into your desired position, and make sure it is level and secure. Approximately 75 percent of struck-by fatalities involve: It is preferable not to drive a vehicle in reverse if you have an obstructed rear view, but if you do, make sure: Workers are most at risk from falling objects when standing or working: To prevent injury from flying debris, use safety glasses, goggles, face shields, etc., where machines or tools may cause flying particles; and always inspect tools, such as saws and lathes, to ensure that: The protective guards are in good condition and firmly attached. Using scaffolds properly can help prevent workplace accidents and injuries. The bottom runners and bearers shall be located as close to the base as possible. Ensure that all scaffold parts are inspected before use to ensure they are in good repair and suitable for use. If uplift could cause the components to separate, locking pins must be used and the components secured. B. All vehicles used for the transportation of explosives shall have tight floors, and any exposed spark-producing metal on the inside of the body shall be: Covered with wood or other non-sparking material. Symptoms of silicosis ____________ , so workers should have a chest x-ray to see if there is lung damage. Outrigger scaffolds are 3 inches or less from the front edge Ladders used to support step, platform, and trestle ladder scaffolds shall be placed, fastened, or equipped with devices to prevent slipping. Many precautions must be taken before scaffolding work can commence. 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. This poses a risk of electrocution not just to the worker holding the tool, but to everyone who contacts the scaffold. a. Subscripts in the reactants must be conserved in the products. Smith, Michael Abbott, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. Choose one answer. Upon completion of the lesson, participants will be able to: Diagonal braces shall be installed between squares on the rear and front sides of the scaffold, and shall extend from the bottom of each square to the top of the next square. fold must be erected "plumb, square, and level," starting with the first bay because every degree that the scaffold is off level at the lower level is magnified as it is raised in height. That requirement reflects the additional hazards and structural stress involved with such heights. 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. Electricity travels in closed circuits, and its normal route is through a conductor. Non-mandatory Appendix A to this subpart contains examples of criteria that will enable an employer to comply with design and loading requirements for tube and coupler scaffolds under 125 feet in height. sawhorses; others are much more complex, such as the scaffolds erected hundreds of Now customize the name of a clipboard to store your clips. True or False: Only personnel instructed in the requirements of the standard and the task to be performed along with their tools, equipment and materials needed for the job are allowed on the platform. 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. We've updated our privacy policy. Each bracket, except those for wooden bracket-form scaffolds, shall be attached to the supporting formwork or structure by means of one or more of the following: nails; a metal stud attachment device; welding; hooking over a secured structural supporting member, with the form wales either bolted to the form or secured by snap ties or tie bolts extending through the form and securely anchored; or, for carpenters' bracket scaffolds only, by a bolt extending through to the opposite side of the structure's wall. A scaffold should always be erected: Choose one answer. Crawling Board. Secure access to the scaffold. Prevent An Expressway Emergency By Merging Without _____. Do not sell or share my personal information. Scaffolding means a convenient platform for persons to work at height. Where conditions preclude the attachment of bracing to posts, bracing shall be attached to the runners as close to the post as possible. Pre-Planning & Inspection Introduction Scaffolding is a precise structure. A thorough understanding of all aspects of missing parts due to area obstructions). Be supported by bearing blocks securely attached to the poles. Window jacks shall not be used to support planks placed between one window jack and another, or for other elements of scaffolding. Scaffolding Injuries Approximately 2.3 million construction workers work on scaffolds regularly. Add several tablespoons of table salt to one cup and stir. 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. Scaffolds shall be constructed in accordance with paragraphs (a), (b), or (c) of this section, as appropriate. Where wooden poles are spliced, the ends shall be squared and the upper section shall rest squarely on the lower section. B. Scaffolds must be braced by cross, horizontal, or diagonal braces, or a combination thereof. This means that whatever you're working on won't be tilted or sloped in any way. When erected scaffolds are to be moved by crane assure that: a. Electric shock occurs when: A. Overhead supporting members (roof structure, ceiling beams, or other structural members) shall be inspected and checked for strength before the scaffold is erected. Ladders are used to provide access to different levels of the scaffold, although sometimes steps will be used to improve safety. 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. Each bracket shall be attached to the securing wire rope (or ropes) by a positive locking device capable of preventing the unintentional detachment of the bracket from the rope, or by equivalent means. 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 _____. The scaffold assembly must be designed to comply with Local, State and Federal safety requirements. 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. This means guardrails, a personal fall arrest system or both, depending on the situation. Scaffolds, once properly erected, are a control measure to prevent the risk of persons and objects falling when working at height. Crawling boards shall be secured to the roof by ridge hooks or by means that meet equivalent criteria (e.g., strength and durability). Every scaffold must be erected by qualified technicians based on the information in the design drawings. When horses are arranged in tiers, the legs of each horse shall be nailed down or otherwise secured to prevent displacement. Your lines should be perfectly vertical (plumb) and horizontal (level), and your corners should be exactly 90 degrees (square). Cross-bracing is required on both front and back sides of each scaffold buck or frame. Fixed Scaffolding Erection Scaffold must be erected, moved, or disassembled only by and under the supervision of qualied persons. 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. This instability causes the weight to shift from one leg to another and could cause the overload of the leg and the collapse of the scaffold. When the pump jack has to pass bracing already installed, an additional brace shall be installed approximately 4 feet (1.2 m) above the brace to be passed, and shall be left in place until the pump jack has been moved and the original brace reinstalled. 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. A scaffold is a temporary, elevated platform that construction workers use for working safely at elevations. Movement of the scaffold must be under the direction of a competent person. D. Armed robots. "Fabricated frame scaffolds" (tubular welded frame scaffolds). Correct answer Special care and training incentives Platforms shall be secured to the brackets in a manner that will prevent the separation of the platforms from the brackets and the movement of the platforms or the brackets on a completed scaffold. A scaffold is a temporary structure specifically erected to support access or working platforms. The site owner may have set restrictions that prevent you from accessing the site. B. A. Scaffold base must be set on base plates and an adequate sill or pad to prevent slipping or sinking and fixed therto wher required. Platform units shall be securely attached to the needle beams by bolts or equivalent means. Faults: Damaged. Scaffolds may only be designed, set up, used, or maintained in accordance with: You've requested a page on a website (cloudflarepreview.com) that is on the Cloudflare network. Crawling boards shall extend from the roof peak to the eaves when used in connection with roof construction, repair, or maintenance. DO NOT ABUSE OR MISUSE THE SCAFFOLD EQUIPMENT. A training program to teach proper lifting techniques should cover: A. Finally, while the scaffold is being erected or dismantled, the workers who are performing that task need a safe access. 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