介绍美国职业安全与健康管理局高处作业安全管理规程课件.ppt

1、BWC Division of Safety&Hygiene OSHA 29 CFR 1926-Subpart M Safety Standards for Fall Protection in the Construction Industry Effective:February 6,1995 BWC Division of Safety&Hygiene Total Construction Fatalities 1985-1993 Falls From Elevation 33%Caught In/Between 18%Struck By 22%Shock 17%Other 10%BWC

2、 Division of Safety&Hygiene Falls From Elevation-Breakdown Roof 27%Other 16%Scaffold 17%Steel Erection 10%Floor Opening 7%Aerial Lift Basket 3%Suspended Platform/Vehicle 3%Concrete Erection 3%Ladder 8%Open Sided Floor 4%BWC Division of Safety&Hygiene 2621852172592252532111811610501001502002503001985

3、19861987198819891990199119921993Number of Construction Fatalities Due to Falls 1985-1993 BWC Division of Safety&Hygiene Analysis of Heights For Construction Fatalities Caused by Falls 1985-1993 2%8%22%20%36%12%0%5%10%15%20%25%30%35%40%30Unk.BWC Division of Safety&Hygiene Construction Activity%of Tot

4、al Fatalities 1985-1993 0%10%20%30%40%50%60%70%Painting,Paper Hanging and Decorations-63%Plumbing,Heating and Air Conditioning-31%Heavy Construction,except Highway&Street-15%Highway and Street,except Elevated Highways-2%Building Construction-Nonresidential-50%Building Construction-Residential-29%BWC

5、 Division of Safety&Hygiene Construction Activity (Contd)%of Total Fatalities 1985-1993 0%20%40%60%80%Miscellaneous Special Trade Contractors 47%Concrete Work 30%Roofing,Siding and Sheet-Metal Work 73%Carpentry and Floorwork 63%Masonry,Stonework,Tile Setting and Plastering 62%Electrical Work 24%BWC

6、Division of Safety&Hygiene 1926.500(a)(1)Scope and Application BWC Division of Safety&Hygiene Whos Affected by Subpart M?EVERYONE EXCEPT:?Employees making an inspection.?Employees working on scaffolds.(Subpart L)?Employees working on stairways and ladders.(Subpart X)?Employees working on equipment u

7、sed in tunneling operations.(Subpart S)BWC Division of Safety&Hygiene Whos Affected by Subpart M?EVERYONE EXCEPT:?Employees engaged in the construction of electric transmission,distribution lines,and equipment.(Subpart V)?Employees working on cranes and derricks.(Subpart N)?Employees performing stee

8、l erection work in buildings.(Subpart R)BWC Division of Safety&Hygiene 1926.500(b)Definitions BWC Division of Safety&Hygiene 1926.501(b)(1)Unprotected Sides and Edges BWC Division of Safety&Hygiene 1926.501(b)(2)Leading Edges BWC Division of Safety&Hygiene Exception:When the employer can demonstrate

9、 that it is infeasible or creates a greater hazard to use these systems,the employer shall develop and implement a fall protection plan.BWC Division of Safety&Hygiene Definition Infeasible -means that it is impossible to perform the construction work using a conventional fall protection system(i.e.,

10、guardrail system,safety net system,or personal fall arrest system)or that it is technologically impossible to use any of these systems to provide fall protection.BWC Division of Safety&Hygiene 1926.501(b)(3)Hoist Areas BWC Division of Safety&Hygiene 1926.501(b)(4)Holes BWC Division of Safety&Hygiene

11、 1926.501(b)(5)Formwork and Reinforcing Steel BWC Division of Safety&Hygiene 1926.501(b)(6)Ramps,Runways,and Other Walkways BWC Division of Safety&Hygiene 1926.501(b)(7)Excavations BWC Division of Safety&Hygiene 1926.501(b)(8)Dangerous Equipment BWC Division of Safety&Hygiene 1926.501(b)(9)Overhand

12、Bricklaying and Related Work BWC Division of Safety&Hygiene 1926.501(b)(10)Roofing Work On Low-Slope Roofs BWC Division of Safety&Hygiene 1926.501(b)(11)Steep Roofs BWC Division of Safety&Hygiene 1926.501(b)(12)Precast Concrete Erection BWC Division of Safety&Hygiene Exception:When the employer can

13、demonstrate that it is infeasible or creates a greater hazard to use these systems,the employer shall develop and implement a fall protection plan.BWC Division of Safety&Hygiene 1926.501(b)(13)Residential Construction BWC Division of Safety&Hygiene Exception:When the employer can demonstrate that it

14、 is infeasible or creates a greater hazard to use these systems,the employer shall develop and implement a fall protection plan.BWC Division of Safety&Hygiene 1926.501(b)(14)Wall Openings BWC Division of Safety&Hygiene 1926.501(b)(15)Walking/Working Surfaces Not Otherwise Addressed BWC Division of S

15、afety&Hygiene 1926.501(c)(1)Protection From Falling Objects?Erect toeboards,screens,or guardrail systems to prevent objects from falling.BWC Division of Safety&Hygiene 1926.501(c)(2)Protection From Falling Objects?Canopy Structure?Barricade BWC Division of Safety&Hygiene 1926.502(b)Guardrail Systems

16、 BWC Division of Safety&Hygiene 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.BWC Division of

17、 Safety&Hygiene 1926.502(b)(9)Guardrail Systems?Top rails and midrails shall be at least 1/4 inch nominal diameter.?Top rail shall be flagged at not more than 6-foot intervals with high-visibility material.BWC Division of Safety&Hygiene 1926.502(b)(13)?Guardrails at points of access shall be provide

18、d with gates or offset to that a person cannot walk directly into the hole.BWC Division of Safety&Hygiene 1926.502(c)Safety Net Systems BWC Division of Safety&Hygiene 1926.502(c)(1)Safety Net Systems?Install as close as practicable under the walking/working surface on which employees are working,but

19、 in no case more than 30 feet below such level.BWC Division of Safety&Hygiene 1926.502(c)(2)Safety Net Systems Net Extension 5 feet and 10 feet 10 feet 13 feet BWC Division of Safety&Hygiene 1926.502(c)(3)Safety Net Systems?Install with sufficient clearance to prevent contact with any surfaces or st

20、ructures below.BWC Division of Safety&Hygiene 1926.502(c)(4)Safety Net Systems When the employer can demonstrate that a drop test is unreasonable,the employer shall certify that the net and installation can meet an impact force equivalent to the impact forces of a drop test.BWC Division of Safety&Hy

21、giene Definition Competent Person -means one who is capable of identifying existing and predictable hazards in the surroundings,or working conditions which are unsanitary,hazardous,or dangerous to employees,and who has authorization to take prompt corrective measures to eliminate them.BWC Division o

22、f Safety&Hygiene 1926.502(c)(5)&(6)Safety Net Systems?Inspect nets weekly for wear,damage,and other deterioration.?Remove any materials,scrap,equipment,and tools,that have fallen into net.BWC Division of Safety&Hygiene 1926.501(c)(7)Safety Net Systems?Maximum mesh opening shall not exceed 36 sq.inch

23、es nor longer than 6 inches on any side.?Mesh crossings shall be secured to prevent enlargement of mesh opening.BWC Division of Safety&Hygiene 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.?Connec

24、tions shall be spaced not more than 6 inches apart.BWC Division of Safety&Hygiene 1926.502(d)Personal Fall Arrest Systems BWC Division of Safety&Hygiene 1926.502(d)Personal Fall Arrest Systems Connector means a device which is used to couple(connect)parts of the personal fall arrest system and posit

25、ioning device systems together.It may be an independent component of the system,such as a carabiner,or it may be an integral component of part of the system(such as a buckle or dee-ring sewn into a body belt or body harness,or a snap-hook spliced or sewn to a lanyard or self-retracting lanyard.)BWC

26、Division of Safety&Hygiene 1926.502(d)(8)Personal Fall Arrest Systems?Horizontal lifelines shall be designed,installed,and used,under the supervision of a qualified person,as part of a complete personal fall arrest system,which maintains a safety factor of at least two.BWC Division of Safety&Hygiene

27、 Definition-from 1926.32(l)Qualified Person -means one who,by possession of a recognized degree,certificate,or professional standing,or who by extensive knowledge,training,and experience,has successfully demonstrated his ability to solve or resolve problems relating to the subject matter,the work,or

28、 the project.BWC Division of Safety&Hygiene 1926.502(d)Personal Fall Arrest Systems Rope Grab means a deceleration device which travels on a lifeline and automatically,by friction,engages the lifeline and locks so as to arrest the fall of an employee.?Lanyards and vertical lifelines shall have a min

29、imum breaking strength of 5,000 lbs.?Each employee shall be attached to a separate lifeline.BWC Division of Safety&Hygiene 1926.502(d)(12)Personal Fall Arrest Systems Self-retracting lifeline/lanyard means a deceleration device containing a drum-wound line which can be slowly extracted from,or retra

30、cted onto,the drum under slight tension during the normal employee movement,and which,after onset of a fall,automatically locks the drum and arrests the fall.BWC Division of Safety&Hygiene 1926.502(d)(12)&(15)Anchorage?Limit free fall distance to 2 ft.or less and able to sustain a 3,000 lb.min.tensi

31、le load.?Capable of supporting at least 5,000 lbs.per employee attached.BWC Division of Safety&Hygiene*t=(2h/g)or:How Long Does It Take To Fall?Height(feet)Time(seconds)4 0.5 16 1.0 36 1.5 64 2.0 100 2.5 144 3.0 256 4.0 576 6.0.5 g=Gravitational Constant of 32.2 ft/s h=Height of Fall in feet t =Time

32、 of Fall in seconds 2*BWC Division of Safety&Hygiene Velocity v=(2gh)v=Velocity,assuming no initial velocity g=Gravitational Constant of 32.2 ft/s h=Height of fall in feet.5 2 BWC Division of Safety&Hygiene Momentum Of Fall M=mv M=Momentum in foot-pounds/second m=Mass in pounds v =Velocity,assuming

33、no initial velocity BWC Division of Safety&Hygiene 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 A skull would fracture at approximately 50 foot-pounds/second.The velocity of a fracture is expressed in the equation:v=BWC

34、 Division of Safety&Hygiene 39702780239583005001000150020002500300035004000Shock AbsorbingLanyardNylon Rope LanyardWebbing LanyardSteel LanyardPeak Fall Arresting Forces-Forces Generated by 220 lbs Steel Weight Free-Falling 6 ft Force in lbs.BWC Division of Safety&Hygiene Determining Minimum Anchora

35、ge Point Height?C=Clearance?H=Anchor Point Height?L=Distance Between Anchorage Point and D-Ring?S=Deceleration Distance?5=Harness D-Ring Height?Free Fall=5+L-H=6 max.OSHA?Clearance=5+L-H+S =9.5 Minimum Clearance where S=3.5 max.OSHA BWC Division of Safety&Hygiene 1926.502(d)(16)&(17)Harnesses?Limit

36、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.BWC Division of Safety&Hygiene 1926.502(e)Positioning Device Systems BWC Division of Safety&Hygiene 1926.502(f)Warning Line Systems BW

37、C Division of Safety&Hygiene Warning-Line System?Erected around all sides of roof work area.?6 feet from edge-10 feet when using mechanical equipment.?Two warning lines at points of access,material handling,storage,and hoisting areas.?Rope,wire,or chain flagged at not more than 6-foot intervals with

38、 high visibility material.BWC Division of Safety&Hygiene Warning-Line System?The rope,wire or chain shall be rigged or supported so that its lowest point is no less than 34 inches and the highest point is no more than 39 inches from the walking/working surface.?Stanchions shall be capable of resisti

39、ng,without tipping over,a force of at least 16 pounds applied horizontally against the stanchion 30 inches from the walking/working surface.BWC Division of Safety&Hygiene Warning-Line System?The rope,wire or chain shall have a minimum tensile strength of 500 pounds.?The line shall be attached so tha

40、t pulling on one section of the line will not result in slack being taken up in adjacent sections.?Employees are not permitted between the roof edge and warning line unless performing roofing work in that area.BWC Division of Safety&Hygiene 1926.502(g)Controlled Access Zones BWC Division of Safety&H

41、ygiene 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.BWC Division of Safety&Hygiene?Consists of ropes,wires,and tape wit

42、h a minimum breaking strength of 200 lbs.and is marked with high visibility materials at not more than 6 foot intervals.?Stanchions rigged so that the lowest point is not less than 39 inches nor more than 45 inches.1926.502(g)(1)Controlled Access Zones-Leading Edge(contd)BWC Division of Safety&Hygie

43、ne?Control line erected not less than 6 feet nor more than 60 feet,or half the length of the member being erected,whichever is less,from the leading edge.1926.502(g)(1)Controlled Access Zones-Precast Concrete BWC Division of Safety&Hygiene?Lines erected not less than 10 ft.nor more than 15 ft.from t

44、he working edge.?Lines extended to enclose all employees performing overhand bricklaying and related work.?Lines erected at each end to enclose zone.?Only employees engaged in work permitted in zone.1926.502(g)(1)Controlled Access Zones-Overhand Bricklaying BWC Division of Safety&Hygiene 1926.502(h)

45、Safety Monitoring Systems BWC Division of Safety&Hygiene Safety-Monitoring System?Competent person to monitor?Warns employees nearing hazard?On same walking/working surface?Within visual Contact?Able to communicate orally with workers?No mechanical equipment used or stored in safety-monitoring syste

46、m area A shout may be the last thing a worker hears as he or she hurtles to the ground.BWC Division of Safety&Hygiene 1926.502(i)Covers BWC Division of Safety&Hygiene 1926.502(i)Covers BWC Division of Safety&Hygiene 1926.502(i)Covers BWC Division of Safety&Hygiene 1926.502(i)Covers BWC Division of S

47、afety&Hygiene 1926.502(i)Covers?Capable of supporting twice the maximum axle load.?Capable of supporting twice employee,equipment,and material weight.?Secured to prevent accidental displacement.?Color coded or marked with the word“HOLE”or“COVER”.BWC Division of Safety&Hygiene 1926.502(j)Protection F

48、rom Falling Objects BWC Division of Safety&Hygiene 1926.502(j)(1),(2)&(3)Toeboards?Erected a sufficient distance to protect employees below.?Able to withstand a force of 50 lbs.outward and downward.?Minimum height of 3 and 1/2 inches with no more than 1/4 inch gap at walking/working surface.BWC Divi

49、sion of Safety&Hygiene 1926.502(j)(5)&(6)Guardrail System?Erect paneling or screening when material exceeds guardrail systems top rail.?No materials or equipment stored within 4 feet of working edge.BWC Division of Safety&Hygiene 1926.502(j)(8)Canopies?Canopies used for falling object protection sha

50、ll be strong enough to support and prevent penetration by any objects which might fall into canopy.BWC Division of Safety&Hygiene 1926.502(k)Fall Protection Plan?Available for employees engaged in leading edge work,precast concrete erection work,or residential construction work only.?Up to date,site