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Subpart Q - Concrete & Masonry Construction(1926.700 - 706)

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23

292701(b)

706(b)

706(a)(1)

Reinforcing steel - Guarding

Masonry walls - Bracing

Masonry construction - Limited access zone

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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

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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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Vertical slip-form operation

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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

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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

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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

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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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•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

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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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• 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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CFR 1926.706 Masonry

Construction.

Concrete and Masonry

•Masonry wall construction–Need a “limited access zone”

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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

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