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OSHA Subpart Q

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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, ... – PowerPoint PPT presentation

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Title: OSHA Subpart Q


1
OSHA Subpart Q
  • Concrete and Masonry Construction

2
Concrete Construction
  • Protruding reinforcing steel, onto and into which
    employees could fall, shall be guarded to
    eliminate the hazard of impalement

3
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

4
Placing Concrete with Buckets
  • Riding Concrete Buckets is not permitted

5
Placing Concrete with Buckets
  • Working under the buckets is not permitted when
    they are elevated or lowered into position

6
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

7
Pumping Concrete
  • Operator of the pneumatic hose must wear proper
    protective head and face equipment

8
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.

9
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

10
Concrete Buckets with Hydraulic or Pneumatic Gates
  • Shall be equipped with positive safety latches or
    similar devices to prevent premature or
    accidental dumping

11
Bull Floats
  • If used near energized electrical conductors,
    bull floats shall be constructed of nonconductive
    material or insulated with a nonconductive sheath.

12
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.

13
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.

14
Cast-in-Place Concrete
  • Sills for shoring shall be sound, rigid, and
    capable of carrying the maximum intended load.

15
When to inspect formwork shoring
  • Immediately prior to concrete placement
  • During concrete placement
  • Immediately after concrete placement

16
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

17
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

18
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

19
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

20
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

21
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

22
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

23
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

24
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

25
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

26
Masonry Construction
  • Limited Access Zone - To be established whenever
    a masonry wall is constructed

27
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

28
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
29
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.

30
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