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Subpart Q - Concrete & Masonry
Construction
(1926.700 - 706)
Reinforcing steel - Guarding
701(b)
706(b)
Masonry walls - Bracing
23
Masonry construction - Limited access zone
706(a)(1) 17
292
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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
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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
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Cooling Tower
St. Mary’s West Virginia 1978
• 51 killed
• 170 feet above ground
• Entire form peeled away from newly placed concrete
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Jump forms atop the St. Mary’s structure tore loose, pulling work platforms and
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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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General Requirements 1926.701
• No construction loads placed on concrete structure unless:
– Employer determines safe to do so
– Person qualified in industrial design
– Structure capable of supporting loads
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All reinforcing steel on which an employee may fall must be guarded.
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• EVERY rebar must be capped
• You are looking at a fine of somewhere between 45 and 250 dollars per instance
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Concrete
Bucket
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No employee is ever permitted to ride concrete buckets
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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
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Concrete Buckets
•If equipped with hydraulic or pneumatic gates, must:
•Have safety device to prevent premature or accidental dumping.
•Shall be designed to prevent concrete from hanging up on top & sides.
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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
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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.
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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.
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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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Do You See Any Violations??
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Vertical slip forms
• Rods or pipes on which jacks climb:
– Designed for that purpose
– No excessive distortion during jacking
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– Provided with scaffolds where employees are required to pass
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Removal of formwork
• 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
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CFR 1926.706
Masonry
Construction.
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• Masonry wall construction
–Need a
“limited access zone”

Limited Access Zone (LAZ)
• Shall be established whenever masonry wall is being constructed
• Prior to start of wall construction
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–Height of wall plus 4’
–Entire length of wall
–On unscaffold side
–Restricted entry
Masons
ONLY!

Limited Access Zone
• 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
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