a scaffold must be erected plumb, square, and level because
ERECTED SCAFFOLDS SHOULD BE CONTINUALLY INSPECTED by users to be sure that they are maintained in safe condition. 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? 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. Tube and coupler scaffolds over 125 feet in height shall be designed by a registered professional engineer, and shall be constructed and loaded in accordance with such design. Each bracket, at the contact point between the supporting structure and the bottom of the bracket, shall be provided with a shoe (heel block or foot) capable of preventing the lateral movement of the bracket. The site owner may have set restrictions that prevent you from accessing the site. The frames must be plumb and level and spaced to adequately support the loads. Add several tablespoons of table salt to one cup and stir. 25. This scaffold is simply a rope attached to a harness with an assembly like a boatswains chair for the worker to sit in. Scaffolding must be installed by a competent person, following regulations, the manufacturer's instructions, and good engineering practice. Just a few example you can find fast on the interwebs, NFI . Scaffolds shall be plumb, level, and squared. Scaffolds and scaffold components shall be designed by a registered professional engineer and shall be constructed and loaded in accordance with such design. OSHA 1926.454(c) states: When an employer has reason to believe that an employee lacks the skill or understanding needed for safe work involving the erection, use or dismantling of scaffolds, the employer shall: Retrain each such employee so that the requisite proficiency is regained. The scaffold assembly must be designed to comply with Local, State and Federal safety requirements. As an example, even in this day of steel and iron, scaffolds made from Learning Objectives 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. 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. 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. Protect themselves by wearing the proper PPE When moving platforms to the next level, the existing platform shall be left undisturbed until the new end frames have been set in place and braced prior to receiving the new platforms. Wire ropes shall be continuous and without splices between anchors. Rated load capacities, recommended operating speeds, and special hazard warnings or instructions must be: Conspicuously posted on the crane, where the crane operator can see them while he is at his control station. C. Explosives Secure access to the scaffold. Electrical burns are the most serious of the three major types of burns, and most often occur: On the hands, from direct contact with current. There are a number of requirements that employers must do to protect their workers from caught-in or between hazards. You've requested a page on a website (cloudflarepreview.com) that is on the Cloudflare network. 6. (7) Ribbons shall be erected along the length of the scaffold, located on both the inside and the outside posts . Platforms shall not extend outward beyond the base supports of the scaffold unless outrigger frames or equivalent devices are used to ensure stability. Scaffolds shall not exceed three tiers in height, and shall be so constructed and arranged that one square rests directly above the other. Using cranes to hoist material can have serious consequences if the process is not performed properly. or more per square foot. Do not force frames or . Prior to starting all demolition operations, OSHA 1926.850 (a) requires that an engineering survey of the structure be conducted by a competent person. 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. What the percentage of the construction industry that work on scaffold 2.3 million or 65 percent Most scaffolds at jobsites are made of what type of material Aluminum, Steel or less commonly wood Caster stems and wheel stems shall be pinned or otherwise secured in scaffold legs or adjustment screws. 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. Window jacks shall not be used to support planks placed between one window jack and another, or for other elements of scaffolding. Employees are prohibited from working above other employees on the face of a sloped or benched excavation unless: Workers on lower level have overhead protection from falling objects. Braces, bearers, and runners shall not be spliced between poles. B. 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. a. c. The Law of Conservation of Matter must be followed. (b) Tube and Coupler Scaffolds. Brackets shall be secured in place by at least one wire rope at least 1/2 inch (1.27 cm) in diameter. Move the personnel platform slowly and cautiously and have a rotation-resistant rope with a safety factor of 10 A scaffold is a temporary, elevated platform that construction workers use for working safely at elevations. 1. Select the equipment you need and place it near the work area. Scaffolds are commonly used in construction work so workers have a safe, stable work platform when work cannot be done at ground level or on a finished floor. 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 Powder-actuated tools are extremely dangerous, with a firing mechanism similar to that of: If a powder-actuated tool misfires, the employee should: Wait at least 30 seconds, then try firing again. Electricity travels in closed circuits, and its normal route is through a conductor. 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 Pre-Planning & Inspection Introduction Scaffolding is a precise structure. Landings for the stair access are assembled within the 1.27m square bays at each end of the stair stringer bays using cuplock 1.27m . Looks like youve clipped this slide to already. Each bearer shall be securely fastened to the platform. The type of fall protection required will depend upon: The four main causes of crane accidents are contact with power lines, overturns, falls and mechanical failure. Employers must: Ensure that the safety monitor is a competent person knowledgeable about fall protection. Supported scaffold poles, legs . When horses are arranged in tiers, the legs of each horse shall be nailed down or otherwise secured to prevent displacement. Materials being hoisted onto a scaffold must When wood poles are constructed of two continuous lengths, they shall be joined together with the seam parallel to the bracket. 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. Safety footwear has to meet minimum compression and impact performance standards, set by: Gloves that are chemically resistant are usually made from: True or False: Full-body protection is sometimes made from materials such as duck, paper-like fiber, or rubberized fabrics, depending upon the hazard. Electrocution, electric shock, burns, indirect (e.g., a fall from a ladder). The inboard end of outrigger beams, measured from the fulcrum point to the extreme point of anchorage, shall be not less than one and one-half times the outboard end in length. 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. Ladders used to support step, platform, and trestle ladder scaffolds shall be placed, fastened, or equipped with devices to prevent slipping. scaffold falls, 4,500 injuries and 50 deaths from scaffold-related accidents would be How to Erect Access Frame Scaffolding How to Erect Access Frame Scaffolding www.worksafebc.com Select . 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. Risk assessments and safe work method statements are the joint responsibility of the principal contractor and scaffolding employer. Each wire rope used for securing brackets in place or as an anchorage for personal fall arrest systems shall be protected from damage due to contact with edges, corners, protrusions, or other discontinuities of the supporting structure or scaffold components. Every element of your orientation must be exact. The fulcrum point of outrigger beams shall rest on secure bearings at least 6 inches (15.2 cm) in each horizontal dimension. Let us know about it through the REPORT button at the bottom of the page. Supports for platforms shall be attached directly to the support stirrup and not to any other platform. The ground is level and stable. Crawling Board. Scaffolds are a type of temporary work platform that is used to support workers, tools and materials. B. Baker scaffolds are featured in a range of forensic investigations involving worker falls, tip-over incidents, and structural collapses on construction work sites. 9. 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. The 1.27m square bays at each end of the scaffold unless outrigger frames or equivalent devices are used support. 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