Concreto y Construcción de Albañilería
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Subparte Q - Concreto y Construcción de albañilería
(1926.700 - 706)
292
23
17
701(b)
706(b)
706(a)(1)
Acero reforzado
Paredes de albañilería- Apuntalamiento
Construcción de albañilería- Zona de acceso limitado
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Concreto y Albañilería• Revisiones de los standars durante los
años 1990’s• El nivel amplía / endurece la protección
contra el colapso de pared• Revised bracing requirements
– Requires limited access zones
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Las revisiones incluyen métodos adicionalesPara pruevas de concreto
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• 51 killed
• 170 pies sobre el piso
• Entire form peeled away from newly placed concrete
Torre de enfriamientoSt. Mary’s West Virginia 1978
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What the St.
Mary’s West
Virginia tower
would have
looked like if it had
been completed.
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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. The state of West Virginia objected to the site being cleaned before it could make its own full
investigation.
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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
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Concrete and Masonry
• All rebar must be capped
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Post-tensioning operations• No employee except
those essential to
operations permitted
behind the jack during
tensioning operations
• Signs and barriers erected to limit employee access to area during operations
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ConcreteBucket
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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Personal Protective Equipment
• If pneumatic hose is
used to pump cement
sand and water mixture
• Employees must wear
protective head and
face equipment
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Bulk cement storage• Storage bins and silos:• Conical or tapered
bottoms• Locked and tagged before
entering• Concrete Mixers: Loading
skip 1yd3 or larger:• Mechanical device to
clear material• Guardrails on each side
of the skip
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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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Power concrete trowels
• Stop automatically
when hand(s) are
released from
control
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Concrete buggy handles may not extend beyond the wheels on either
side of the buggy
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Safety device requiredto prevent premature or
accidental dumping
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• Tremies: secured with wire rope (or similar) in addition
to regular couplings or connections
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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 bladeEnclosure must provide for retaining flying blade fragments
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Lockout/Tagout Procedures• No repair or maintenance
on equipment where inadvertent operation of the equipment could occur and cause injury unless hazardous energy sources have been locked out and tagged
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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 job site
• Must include all revisions
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Shoring and reshoring• Shoring inspected prior to
erection for
• Conformance with
formwork drawings
• Damaged shoring
equipment not used
• Shoring damaged after
erection immediately
reinforced
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Shoring and reshoring
• Sills sound, rigid, and
capable of carrying the
maximum intended load
• Base plates, shore heads,
adjustment screws in firm
contact w/ form and
foundation
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Tiered single post shores• Designed & inspected
by qualified
engineer
• Vertically aligned
• Spliced to prevent
misalignment
• Braced in 2 mutually
perpendicular directions
at splice
• Each tier diagonally
braced in same 2 dir.
• No raising of shores
after concrete poured
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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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1926.703(c) Vertical slip forms
Jack rod
Jack
Yoke assembly
Working deck
Wales
Bracing for Wales
Slight batter of sheathingSheathing
Splash board
Thin pipe aroundjack rod
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Vertical slip-form operation
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Reinforcing Steel• For walls, piers, columns, & other vertical structure
shall be supported to prevent overturning or collapse• Employers take measures to prevent wire mesh from
recoiling
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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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Flying forms
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Precast concrete
• Tilt-up walls supported to prevent overturning & collapse
• Lifting inserts capable of supporting 2X the intended load
• Lifting inserts in other than tilt-up members 4X the intended load
• Lifting Hardware… 5X intended load
• Only erectors under members being lifted
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Lift-slab operations
• Designed and planned by registered P.E. w/ experience in lift-slab construction– Employer must implement P.E.’s design– Plans include instructions, sketches & method of
erection– Design ensures lateral stability of the
building/structure during construction
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• Jacks designed so they will not lift, or continue to lift if loaded beyond their rated capacity
• Jacks synchronized so that all points are within 1/2 inch of being level
Lift-slab operations
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Jack rod
Lifting angle
Seal block
Spearhead framecast in floor slab
Wedge
Wedge block
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Jack lifting unit
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Manual lifting controls shall be centrally located
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CFR 1926.706 Masonry construction.
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Limited Access Zone
• Shall be established whenever a
masonry wall is being constructed
• Prior to start of construction
• Equal to height of wall plus four feet
• Entire length of wall
• Opposite scaffold side
• Only masons allowed
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• L.A.Z. shall remain in place until wall is supported
• If wall is over eight feet tall it must be braced unless adequately supported
• Bracing must remain until permanent support structures are in place
Limited Access Zone
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