高空作业-坠落防护fall protection-osha 29 cfr (ppt).ppt

1926.500(b) Definitions 1926.501(b)(2) Leading Edges 1926.501(b)(3) Hoist Areas 1926.501(b)(4) Holes 1926.502(b) GuardrailSystems 1926.502 (b)(1), (2) (14) Top edge height shall be 42” +/- 3” from walking/working level, and able to withstand 200 lbs. of force. Midrails shall be installed at a height midway between top edge and walking/working level, and able to withstand 150 lbs. of force. 1926.502 (b)(13) Guardrails at points of access shall be provided with gates or offset to that a person cannot walk directly into the hole. 1926.502(c) Safety Net Systems 1926.501(c)(8)(9) Safety Net Systems Minimum breaking strength for border rope webbing is 5,000 lbs. Connections shall be as strong as net components. Connections shall be spaced not more than 6 inches apart. 1926.502(d) Personal FallArrest Systems 1926.502(d)(12) (15) Anchorage Velocity v = (2gh) v = Velocity, assuming no initial velocity g = Gravitational Constant of 32.2 ft/s h = Height of fall in feet Momentum Of Fall M = mv M = Momentum in foot- pounds/second m = Mass in pounds v = Velocity, assuming no initial velocity Skull Fracture 2Eg m 50 x 2 x 32.2 12 16.3 ft/sec E = Kinetic Energy g = Gravitational Constant m = Weight of an average human head 1926.502(d)(16) (17) Harnesses Limit maximum arresting force to 1,800 pounds. Rigged so that an employee cannot free fall more than 6 feet. Attachment point located in center of back near shoulder level. 1926.502(f) Warning LineSystems 1926.502(g) Controlled Access Zones 1926.502(g)(1) Controlled Access Zones - Leading Edge Extends parallel along the unprotected or leading edge. Control line connected to guardrail system or wall. Line situated not less than 6 feet nor more than 25 feet from edge. 1926.502(g)(1) Controlled Access Zones - Leading Edge (cont’d) Consists of ropes, wires, and tape with a minimum breaking strength of 200 lbs. and is marked with high visibility materials at not more than 6 foot