Demolition Diapositif

8/11/2019 Demolition Diapositif

1/29

DemolitionSection 23


2/29

Demolition

References

EM 385-1-1 Section 23

29 CFR 1926.850 Subpart T

UFGS 01 35 26 (Latest)

Accident Abstracts


3/29

DemolitionPotential Contractor Mishap Outcomes

Fires Explosions

Electrical shock

Structural collapse

Asbestos, Lead, PCB, Arsenic exposure

Leading to property damage, injury,and death.


4/29

Direct Causes ofDemolition Mishaps

No engineering survey performed by

Professional Engineer.

No demolition plan prepared or reviewed by aProfessional Engineer.

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

Inadequate types,numbers, and locations offire extinguishers.

Welding and Cutting near flammables andcombustibles.


5/29

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 trainingprior to phase of work.

Accepted Demolition Plan notimplemented

Regular site safety inspections notperformed.

Extinguishers or other fire protection

devices not provided.


6/29

Section 23 Demolition

23.A.01 Demolition activities shallbe performed in accordance with

ANSI Standard A10.6, SafetyRequirements for Demolition.


7/29

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


8/29

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

Professional Engineer - of the structure todetermine the structure layout, the condition

of the framing, floors, walls, the possibility ofunplanned collapse of any portion of thestructure (any adjacent structure whereemployees or property may be exposed shallbe similarly checked), and the existence ofother potential or real demolition hazards;


9/29

Demolition-Section 23.A.01

(3)A demolition plan - by a RegisteredProfessional Engineer and based onthe engineering and lead and asbestos

surveys - for the safe dismantling andremoval of all building components anddebris.


10/29


11/29

Employee Training

All employees engaged in demolitionactivities

Instructed in Demolition Activities

Conduct work activities in safe manner


12/29

Utilities

All electric, gas, water, steam, sewer,and other service lines shall be:

Shut off

Capped

Or otherwise controlled

Before demolition is started


13/29

Mechanical Equipment

Mechanical equipment shall not be usedon floors or walking surfaces unlessfloors or surfaces are of sufficient

strength to support the imposed load


14/29

Access Ways

Employee entrances tomulti-story structuresbeing demolished shallbe protected by: Side walk sheds

Canopies

Or both

Protection shall beprovided from face ofbuilding for a minimumof 8 feet.


15/29

Debris Removal

Material Chutes


16/29

Wall Removal

Masonry walls shall not permitted to fallupon the floors of the building as toexceed the safe carrying capacities

No wall section >10 feet in height shallbe permitted to stand without lateralbracing

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


17/29

Wall Removal

Floor openings within 3m (10 ft) of anywall being demolished shall be plankedsolid except when employees are kept

out of the area below


18/29

Wall Removal

In buildings of skeleton-steelconstruction, the steel framing may beleft in place:

During the demolition of masonry All steel beams, girders, and structural

supports shall be cleared of all loosematerial

Masonry demolition progressesdownward


19/29

Floor Removal

Openings cut shall extend the full spanof the arch between supports

When floor arches are being removed,

employees shall not be allowed in thearea directly underneath

Area shall be barricaded and signed towarn of the hazard


20/29

Steel Removal

When floor arches have beenremoved, planking shall be providedfor the workers razing the steel

framing


21/29

Steel Removal

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


22/29

Steel Removal

Any structural member beingdismembered shall not be overstressed


23/29

Mechanical Demolition

No person shall be permitted in any area whichcan be affected by demolition when balling orclamming is being performed.

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


24/29


Weight of the demolition ballshall not exceed 50% of thecranes rated load, based onlength of the boom and maximumangle of operation at which thedemolition ball will be used.

Or it shall not exceed 25% of thenominal breaking strength of theline which it is suspended.


25/29


The crane boom and load line shallbe as short as possible


26/29


The ball shall beattached to the loadline with a swivel

connection and beattached bepositive means so

that the weightcannot accidentallydisconnect


27/29


When pulling overwalls or portions ofwalls, all steel

members affectedshall be cut free


28/29


All roof cornices orother ornamentalstonework shall be

removed prior topulling walls over


29/29

Questions????????

Documents

Demolition Diapositif