BOSHBOSHCONSTRUCTION INDUSTRYCONSTRUCTION INDUSTRY

Topic: Topic: DEMOLITIONDEMOLITION

DurationDuration :: 30 minutes 30 minutes

General contents:General contents:

Precautionary measuresPrecautionary measures

Mechanical demolitionMechanical demolition

DEMOLITIONDEMOLITION

OBJECTIVEOBJECTIVEINTRODUCTIONINTRODUCTIONPUBLIC SAFETYPUBLIC SAFETYPLANNING STAGEPLANNING STAGEPREPARATION STAGEPREPARATION STAGEDEMOLITION STAGEDEMOLITION STAGE

AGENDA AGENDA

OBJECTIVEOBJECTIVE

-- To establish a safe work To establish a safe work

procedure during demolitionprocedure during demolition

operations.operations.

-- Prior to permitting employees Prior to permitting employees to start demolition operations, to start demolition operations, an engineering survey of the an engineering survey of the structure shall be made by a structure shall be made by a competent person to determine competent person to determine the condition of the framing, the condition of the framing, floors, and walls, and possibility floors, and walls, and possibility of unplanned collapse of any of unplanned collapse of any portion of the structure.portion of the structure.

INTRODUCTIONINTRODUCTION

-- Any adjacent structures where Any adjacent structures where employees may be exposed employees may be exposed shall also be similarly checked.shall also be similarly checked.

-- The employer shall have The employer shall have evidence that such survey has evidence that such survey has been performed.been performed.

INTRODUCTIONINTRODUCTION

A.A. FOR PUBLIC SAFETY, THE FOLLOWING FOR PUBLIC SAFETY, THE FOLLOWING PROCEDURES SHALL BE ADOPTED AND PROCEDURES SHALL BE ADOPTED AND ACTIONS TAKEN WHENEVER REQUIRED.ACTIONS TAKEN WHENEVER REQUIRED.

Survey of the site vicinity for potential Survey of the site vicinity for potential danger to the publicdanger to the public

Install the necessary hoarding along or Install the necessary hoarding along or within the site boundary.within the site boundary.

If possible, entrances to the site be If possible, entrances to the site be located away from heavy traffic areas.located away from heavy traffic areas.

PUBLIC SAFETYPUBLIC SAFETY

(FOR PUBLIC SAFETY, THE FOLLOWING PROCEDURES SHALL BE (FOR PUBLIC SAFETY, THE FOLLOWING PROCEDURES SHALL BE ADOPTED AND ACTIONS TAKEN WHENEVER REQUIRED ADOPTED AND ACTIONS TAKEN WHENEVER REQUIRED cont’d.)cont’d.)

Install the necessary covered walkway Install the necessary covered walkway (footpath with overhead shelter).(footpath with overhead shelter).Install safety signs and posters to Install safety signs and posters to warn the public of danger.warn the public of danger.Install the necessary lighting along Install the necessary lighting along the walkway.the walkway.Provide guard to direct and control Provide guard to direct and control traffic (vehicles and pedestrians).traffic (vehicles and pedestrians).Guard to prevent unauthorized person Guard to prevent unauthorized person from entering the site.from entering the site.

PUBLIC SAFETYPUBLIC SAFETY

B. TO PREVENT FALLING HAZARDS B. TO PREVENT FALLING HAZARDS FROM HIGH LEVELS OF BUILDING(S) FROM HIGH LEVELS OF BUILDING(S) CLOSE TO PUBLIC AREAS, THE CLOSE TO PUBLIC AREAS, THE FOLLOWING MEASURES SHALL BE FOLLOWING MEASURES SHALL BE CONSIDERED.CONSIDERED.

Install external scaffolding along the Install external scaffolding along the periphery of the building.periphery of the building.

Install peripheral overhead Install peripheral overhead cantilever shelter.cantilever shelter.

Install safety netting.Install safety netting.

PUBLIC SAFETYPUBLIC SAFETY

C. WHILE CARRYING EXTERNAL WORKS C. WHILE CARRYING EXTERNAL WORKS (ROAD, DRAINAGE, CULVERT AND (ROAD, DRAINAGE, CULVERT AND MANHOLE) OUTSIDE THE MANHOLE) OUTSIDE THE BOUNDARY, THE FOLLOWING BOUNDARY, THE FOLLOWING MEASURES ARE NECESSARY;MEASURES ARE NECESSARY;Enclose the work areas with Enclose the work areas with barricades.barricades.Install warning signs.Install warning signs.Install hazard lights.Install hazard lights.Station at least a suitable person to Station at least a suitable person to direct the traffic.direct the traffic.

PUBLIC SAFETYPUBLIC SAFETY

Obtain the as-built drawing from Obtain the as-built drawing from the the owner/architect/consultant/relevowner/architect/consultant/relevant authorities.ant authorities.

Attend the briefing (if any) Attend the briefing (if any) conducted by owner/architect.conducted by owner/architect.

Study the drawings and survey Study the drawings and survey the building(s) to be demolished the building(s) to be demolished and the surrounding areas.and the surrounding areas.

PLANNING STAGEPLANNING STAGE

Consult structural Consult structural engineer/demolition engineer/demolition expert/local authority for expert/local authority for further information.further information.

Conduct test on the building Conduct test on the building structure if necessary.structure if necessary.

Plan the procedure and adopt Plan the procedure and adopt the safest demolition method.the safest demolition method.

PLANNING STAGEPLANNING STAGE

Inform the relevant authorities (Police, Inform the relevant authorities (Police, DENR/EMB, DPWH, City/Mun. Bldg. DENR/EMB, DPWH, City/Mun. Bldg. Office).Office).Cordon off the area where the Cordon off the area where the demolition work is to be carried out.demolition work is to be carried out.Install hoarding around the site.Install hoarding around the site.Install exterior protection (scaffold0 Install exterior protection (scaffold0 with netting/canvass sheet along the with netting/canvass sheet along the periphery of the building(s) (except periphery of the building(s) (except when using explosives).when using explosives).Install Notice Boards and Warning Install Notice Boards and Warning Signs.Signs.

PREPARATION STAGEPREPARATION STAGE

Contact/advise relevant authorities Contact/advise relevant authorities to disconnect services in the area. to disconnect services in the area. Particularly, the electrical and gas. Particularly, the electrical and gas. Failure to do so may result in Failure to do so may result in electric shock, gassing, fire, electric shock, gassing, fire,

explosions or flooding.explosions or flooding.Check and confirm that the services Check and confirm that the services are dead before dismantling and are dead before dismantling and removing them.removing them.

DEMOLITION STAGE CONT’D.DEMOLITION STAGE CONT’D.

Dismantle and remove Dismantle and remove immediately from site immediately from site

all combustible materials to all combustible materials to prevent hazards.prevent hazards.

It is dangerous to leave isolated It is dangerous to leave isolated walls or partswalls or parts

of walls standing.of walls standing.

Debris falling from the hacking/drilling Debris falling from the hacking/drilling should be confined to the interior of the should be confined to the interior of the building.building.Spraying of water on debris, prevent air Spraying of water on debris, prevent air pollution and also avoid fire hazards.pollution and also avoid fire hazards.Debris should not be allowed to build up Debris should not be allowed to build up against walls or on floors. Overloading against walls or on floors. Overloading may cause the structure to collapse may cause the structure to collapse resulting in accident.resulting in accident.Debris should either be hoisted down in Debris should either be hoisted down in buckets or by using proper rubbish chute buckets or by using proper rubbish chute and must never be thrown from the top.and must never be thrown from the top.

DEMOLITION STAGE CONT’D.DEMOLITION STAGE CONT’D.

Where practical, avoid working Where practical, avoid working directly from parts of the structure to directly from parts of the structure to be demolished. E.g. at the top of brick be demolished. E.g. at the top of brick wall.wall.Preferably, all demolition works be Preferably, all demolition works be carried out on the same level. Never carried out on the same level. Never work below the level where the work below the level where the demolition work is in progress.demolition work is in progress.When using hot processes such as When using hot processes such as flame cutting of metal, fire flame cutting of metal, fire extinguisher must be readily extinguisher must be readily available.available.

DEMOLITION STAGE CONT’D.DEMOLITION STAGE CONT’D.

When cutting, containers of inflammable When cutting, containers of inflammable materials, it is essential to check and materials, it is essential to check and confirm that it is safe before commencing confirm that it is safe before commencing with the flame cutting.with the flame cutting.Preferably, all hacking and drilling be Preferably, all hacking and drilling be done using low noise equipment.done using low noise equipment.If heavy equipment, such as excavators If heavy equipment, such as excavators with hydraulic breakers and cutters have with hydraulic breakers and cutters have to be used even at high levels, it is to be used even at high levels, it is important to ensure that the existing floor important to ensure that the existing floor structures can take the load of the structures can take the load of the equipment.equipment.

DEMOLITION STAGE CONT’D.DEMOLITION STAGE CONT’D.

The demolition work must be The demolition work must be supervised and monitored closely by supervised and monitored closely by experience supervisors/engineers.experience supervisors/engineers.

Demolition workers must have the Demolition workers must have the experience or have undergone experience or have undergone training and be competent enough training and be competent enough to carry out the works.to carry out the works.

DEMOLITION STAGE CONT’D.DEMOLITION STAGE CONT’D.

Daily briefing by the person who is Daily briefing by the person who is overall in-charge must be overall in-charge must be conducted. The briefing shall conducted. The briefing shall include information on:include information on:

Scope and distribution of works for Scope and distribution of works for the day.the day.Locations of work to be carried out.Locations of work to be carried out.Areas to avoid.Areas to avoid.Safety measures to take.Safety measures to take.Equipment to use.Equipment to use.

DEMOLITION STAGE CONT’D.DEMOLITION STAGE CONT’D.

All workers must also be furnished All workers must also be furnished with the necessary personal with the necessary personal protective equipment such as; protective equipment such as; Safety Helmets, Safety Shoes, Safety Helmets, Safety Shoes, Safety Belts/harness, Gloves, Masks, Safety Belts/harness, Gloves, Masks, Ear Plugs/Muffs, Safety Ear Plugs/Muffs, Safety Goggles/Glass, etc.Goggles/Glass, etc.

No unauthorized person is allowed No unauthorized person is allowed to enter the site.to enter the site.

DEMOLITION STAGE CONT’D.DEMOLITION STAGE CONT’D.

DemolitionSafetyDemolitionSafety