Demolition - OSHAcademy Potential Contractor Mishap Outcomes Fires Explosions Electrical shock Structural collapse Asbestos, Lead, PCB, Arsenic exposure Leading to …

DemolitionSection 23

Demolition

References EM 385-1-1 Section 23 29 CFR 1926.850 Subpart T UFGS 01 35 26 (Latest) Accident Abstracts

Demolition

Potential Contractor Mishap Outcomes Fires Explosions Electrical shock Structural collapse Asbestos, Lead, PCB, Arsenic exposure

Leading to property damage, injury, and death.

Direct Causes of Demolition Mishaps

No engineering survey performed by Professional Engineer.

No demolition plan prepared or reviewed by a Professional Engineer.

Improper storage/use/disposal of flammable and combustible materials, scraps, etc...

Inadequate types,numbers, and locations of fire extinguishers.

Welding and Cutting near flammables and combustibles.

Indirect Causes of Demolition Mishaps

Lack of training, supervision or implementation of SOPs.

Failure to apply AHA/ORM by site superintendent.

Inadequate site-specific safety training prior to phase of work.

Accepted Demolition Plan not implemented

Regular site safety inspections not performed.

Extinguishers or other fire protection devices not provided.

Section 23 Demolition

23.A.01 Demolition activities shall be performed in accordance with ANSI Standard A10.6, Safety Requirements for Demolition.

Demolition-Section 23

23.A.01 Surveys and planning» a. Prior to initiating demolition activities the

following survey and plan shall be accomplished: > see lead and asbestos requirements in Section 06

Demolition-Section 23.A.01 (1) an engineering survey - by a Registered

Professional Engineer - of the structure to determine the structure layout, the condition of the framing, floors, walls, the possibility of unplanned collapse of any portion of the structure (any adjacent structure where employees or property may be exposed shall be similarly checked), and the existence of other potential or real demolition hazards;

Demolition-Section 23.A.01 (3)A demolition plan - by a Registered

Professional Engineer and based on the engineering and lead and asbestos surveys - for the safe dismantling and removal of all building components and debris.

Surveys

GDA and the Contractor’s designated authority– Provided written evidence – Surveys have been performed – Copies provided of the

demolition plan

Employee Training

All employees engaged in demolition activities – Instructed in Demolition Activities– Conduct work activities in safe manner

Utilities

All electric, gas, water, steam, sewer, and other service lines shall be:– Shut off– Capped – Or otherwise controlled – Before demolition is started

Mechanical Equipment

Mechanical equipment shall not be used on floors or walking surfaces unless floors or surfaces are of sufficient strength to support the imposed load

Access Ways

Employee entrances to multi-story structures being demolished shall be protected by:– Side walk sheds– Canopies – Or both– Protection shall be

provided from face of building for a minimum of 8 feet.

Debris Removal

Material Chutes

Wall Removal

Masonry walls shall not permitted to fall upon the floors of the building as to exceed the safe carrying capacities

No wall section >10 feet in height shall be permitted to stand without lateral bracing

Employees shall not be permitted to work on walls when weather is a hazard

Wall Removal

Floor openings within 3m (10 ft) of any wall being demolished shall be planked solid except when employees are kept out of the area below

Wall Removal

In buildings of skeleton-steel construction, the steel framing may be left in place:– During the demolition of masonry– All steel beams, girders, and structural

supports shall be cleared of all loose material

– Masonry demolition progresses downward

Floor Removal

Openings cut shall extend the full span of the arch between supports

When floor arches are being removed, employees shall not be allowed in the area directly underneath

Area shall be barricaded and signed to warn of the hazard

Steel Removal

When floor arches have been removed, planking shall be provided for the workers razing the steel framing

Steel Removal

Steel construction shall be dismantled column-by-column and tier-by-tier (columns may be two-story lengths)

Steel Removal

Any structural member being dismembered shall not be overstressed

Mechanical Demolition No person shall be permitted in any area which

can be affected by demolition when balling or clamming is being performed.

Only those persons necessary for the operations shall be permitted in the area

Mechanical Demolition Weight of the demolition ball

shall not exceed 50% of the crane’s rated load, based on length of the boom and maximum angle of operation at which the demolition ball will be used.

Or it shall not exceed 25% of the nominal breaking strength of the line which it is suspended.

Mechanical Demolition The crane boom and load line shall

be as short as possible

Mechanical Demolition

The ball shall be attached to the load line with a swivel connection and be attached be positive means so that the weight cannot accidentally disconnect

Mechanical Demolition When pulling over

walls or portions of walls, all steel members affected shall be cut free

Mechanical Demolition All roof cornices or

other ornamental stonework shall be removed prior to pulling walls over

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