OSHA Subpart Q

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OSHA Subpart Q

• Concrete and Masonry Construction

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Concrete Construction

• Protruding reinforcing steel, onto and into which
  employees could fall, shall be guarded to
  eliminate the hazard of impalement

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Post-tensioning Operations

• No employee shall be permitted to be behind the
  jack during tensioning operations, except those
  essential to the jacking operation
• Use signs and barriers to limit employee access
  to post-tensioning area during this operation

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Placing Concrete with Buckets

• Riding Concrete Buckets is not permitted

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Placing Concrete with Buckets

• Working under the buckets is not permitted when
  they are elevated or lowered into position

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Placing Concrete with Buckets

• Route elevated concrete buckets so no employees
  (or as few employees as possible) are exposed to
  the hazards of falling concrete buckets

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Pumping Concrete

• Operator of the pneumatic hose must wear proper
  protective head and face equipment

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Bulk Cement Storage

• Storage bins to have tapered or conical bottoms
• No employee is permitted in the storage facility
  unless the ejection system is shut down, locked
  out, and tagged.

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Power Concrete Trowels

• Powered, but manually guided, trowels shall be
  equipped with a control switch that will
  automatically shut off the power whenever the
  hands of the operator are removed

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Concrete Buckets with Hydraulic or Pneumatic Gates

• Shall be equipped with positive safety latches or
  similar devices to prevent premature or
  accidental dumping

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Bull Floats

• If used near energized electrical conductors,
  bull floats shall be constructed of nonconductive
  material or insulated with a nonconductive sheath.

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Cast-in-Place Concrete

• Formwork shall be designed and constructed so
  that the forms will be capable of supporting,
  without failure, all vertical and lateral loads
  that can be reasonably anticipated.

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Cast-in-Place Concrete

• Shores and reshores shall be inspected prior to
  use.
• Erected shoring equipment shall be inspected
  immediately prior to, during, and immediately
  after concrete placement.

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Cast-in-Place Concrete

• Sills for shoring shall be sound, rigid, and
  capable of carrying the maximum intended load.

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When to inspect formwork shoring

• Immediately prior to concrete placement
• During concrete placement
• Immediately after concrete placement

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Shoring for Formwork

• Sills for shoring shall be sound, rigid, and
  capable of carrying the intended load
• There shall be no eccentric loads on shore heads,
  unless for this purpose

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Single post shores when used on top of another
(tiered)

• The system shall be designed by a qualified
  design
• The erected system shall be inspected by an
  engineer qualified in structural design
• Single post shores shall be vertically aligned
• Single post shores are not to be raised after
  concrete is placed

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Reshoring

• Reshores are to be put in place as the original
  forms and shores are removed
• Reshores are required when the concrete cannot
  support the loads

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Vertical Slip Forms

• Steel rods and pipes on which jacks climb or by
  which the forms are lifted shall be designed for
  the purpose
• Shall be provided with scaffolds or work
  platforms where employees are required to work or
  pass
• Loads shall not exceed the rated loads of the
  jacks

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Vertical Slip Forms

• The jacks or lifting devices shall be equipped
  with mechanical dogs or automatic holding devices
  to support the slip forms when the power supply
  or lifting mechanism fails
• Do not exceed the predetermined safe rate of lift

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Reinforcing Steel

• Reinforcing steel for wall, piers, columns and
  similar vertical structures shall be adequately
  supported to prevent overturning
• Prevent unrolled wire mesh from recoiling

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Removal of Formwork

• Forms and shores (except slab on grade and slip
  forms) shall not be removed until the concrete
  has gained sufficient strength to support its
  weight and superimposed loads
• According to the plans and specs
• Concrete strength has been tested
• Dont remove reshores until concrete
• strength is adequate

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Precast Concrete

• Includes wall units, structural framing and
  tilt-up wall panels
• Shall be adequately supported to prevent
  overturning and collapse
• Lifting inserts (tilt-up panels) shall be capable
  of carrying twice the intended load
• Lifting inserts (members other than tilt-up)
  shall be capable of carrying four times the
  intended load
• Lifting hardware to carry 5 times the intended
  load

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Placing Concrete Members

• No employees hall be permitted under precast
  concrete members being lifted or tilted into
  position
• Exception, employees required to be so located
  for the erection of those members

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Lift Slab Construction

• Designed by a registered professional engineer
• Jacks to support 2.5 times the load being lifted
• All jacking points shall stay within 1/2 of that
  needed to maintain the slab in a level position
• Only essential jacking personnel permitted in the
  structure when jacking is taking place

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Masonry Construction

• Limited Access Zone - To be established whenever
  a masonry wall is constructed

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Limited Access Zone

• Established prior to beginning construction of
  the wall
• Runs the length of the wall
• Horizontal projection that is equal to the wall
  height plus 4 feet
• Established on the side of the wall that is not
  scaffolded

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Limited Access Zone
Accessible only to workers actively engaged in
constructing the wall. No others are to enter
this zone
H
Scaffolded Side
H 4 feet
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Limited Access Zone

• Must remain in place until the wall is adequately
  supported to prevent overturning
• If over 8 feet in height, the zone is to remain
  in place until the wall is adequately braced to
  prevent overturning. The bracing is to remain in
  place until the permanent supporting elements of
  the structure are in place.

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