OSHA Office of Training and Education 1 Walking-Working Surfaces.
5/1/2015OSHA Office of Training & Education 1. 5/1/2015OSHA Office of Training & Education 2 Subpart...
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Transcript of 5/1/2015OSHA Office of Training & Education 1. 5/1/2015OSHA Office of Training & Education 2 Subpart...
04/18/23 OSHA Office of Training & Education
2
Subpart Q - Concrete & Masonry Construction(1926.700 - 706)
17
23
292701(b)
706(b)
706(a)(1)
Reinforcing steel - Guarding
Masonry walls - Bracing
Masonry construction - Limited access zone
04/18/23 OSHA Office of Training & Education
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Concrete and Masonry
• Revisions to standard during the 1990’s
• Standard expands/toughens protection against wall collapse– Revised bracing requirements– Requires ‘limited access zones’
• Standard focus on guarding of exposed reinforcing steel
04/18/23 OSHA Office of Training & Education
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Cast-in-Place Concrete• Cast in place
concrete must be capable of supporting, without failure:
• vertical loads• lateral loads• Use ANSI A10.9-1983
• Drawings and plans • Must be on jobsite• Must include all
revisions
04/18/23 OSHA Office of Training & Education
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• 51 killed
• 170 feet above ground
• Entire form peeled away from newly placed concrete
Cooling TowerSt. Mary’s West Virginia 1978
04/18/23 OSHA Office of Training & Education
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Jump forms atop the St. Mary’s structure tore loose, pulling work platforms and
concrete down inside the tower.
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Wreckage 168 feet below the top of the St. Mary’s tower being picked apart by
investigators looking for clues.
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• No construction loads placed on concrete structure unless:– Employer determines
safe to do so – Person qualified in
industrial design
– Structure capable of supporting loads
General Requirements 1926.701
04/18/23 OSHA Office of Training & Education
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Concrete and MasonryAll reinforcing steel on which an employee
may fall must be guarded.
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Concrete and Masonry
• EVERY rebar must be capped• You are looking at a fine of somewhere
between 45 and 250 dollars per instance
04/18/23 OSHA Office of Training & Education
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ConcreteBucket
No employee is ever permitted
to ride concrete buckets
04/18/23 OSHA Office of Training & Education
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Working under loads
• No employee shall work under concrete bucket while:– Bucket is being raised– Bucket is being lowered– To the extent practical…
route buckets so no employees or the fewest number are exposed
04/18/23 OSHA Office of Training & Education
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•If equipped with hydraulic or pneumatic gates, must:•Have safety deviceto prevent premature oraccidental dumping.
•Shall be designed to prevent concrete from hanging up on top & sides.
Concrete Buckets
04/18/23 OSHA Office of Training & Education
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Concrete pumping systems• Provided with pipe
supports designed for 100% overload
• Compressed air hoses on pumping systems:– Positive fail-safe
joint connectors – Prevent separation
of sections while pressurized
04/18/23 OSHA Office of Training & Education
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Personal Protective Equipment
• If pneumatic hose is
used to pump cement
sand and water
mixture
• Employees must
wear head and face
and eye protection.
04/18/23 OSHA Office of Training & Education
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Bulk cement storage safety• Storage bins and silos:
– Conical or tapered bottoms
• Concrete Mixers:• Mechanical device to
clear material• Guardrails on each side
• No employee permitted to enter unless ejection system shut down / locked & tagged out so system can’t operate.
04/18/23 OSHA Office of Training & Education
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Power concrete trowels
Dead-man control:
• Stop automatically
when hand(s) are
released from control
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Bull floats
• If handles could
contact electrical
conductors they
must be of the
non- conductive
type
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•Guarded with semi-circular enclosure over blade•Enclosure must provide for retaining flying blade fragments
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• Rods or pipes on which jacks climb:– Designed for that
purpose– No excessive
distortion during jacking
– Provided with scaffolds where employees are required to pass
Vertical slip forms
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• Forms and shores (Except those used for slabs on grade & slip forms):– Not removed until Employer
determines concrete has gained sufficient strength to support its weight and superimposed loads
Removal of formwork
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Limited Access Zone (LAZ)
• Shall be established
whenever masonry wall
is being constructed
• Prior to start of wall
construction
Limited Access Zone (LAZ)–Height of wall plus 4’
–Entire length of wall
–On un-scaffold side
–Restricted entry
Masons ONLY!
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• Shall remain in place until wall is supported
• If wall is over 8’ tall it must be braced
• Bracing must remain until permanent support structures are in place
Limited Access Zone