Demolition

Demolition

The systematic dismantling or destruction of a building or structure to clear a site for new construction or to remove unsafe structures.

Importance of Demolition

• Makes space for new development.

• Ensures safety by removing unstable structures.

• Allows for material recovery and recycling.

• Enables urban renewal and modernization.

Stages of Demolition

1. Pre-Demolition Planning

2. Execution Stage

3. Post-Demolition

Types of Demolition

Selective
Partial
Total

Partial Demolition

Only part of the structure is removed (e.g., removing a wall or floor).

Total Demolition

Entire building is brought down to clear the site.

Selective Demolition

Specific components or materials are removed for reuse or recycling.

Manual Demolition

• Hand tools used for small buildings or limited demolition.

• Sledgehammers, crowbars, jackhammers.

Mechanical Demolition

• Heavy machinery breaks down the structure systematically.
  Excavators, bulldozers, wrecking balls.

Implosion/Controlled Blasting

• Explosives weaken structural supports for the building to collapse inward.

• Dynamite, detonation cords.

Deconstruction (Piece-by-Piece)

• Environmentally friendly approach to salvage materials.

• Hand and mechanical tools.

Factors Affecting Method Selection

• Building height and structure.

• Site location and proximity to other buildings.

• Environmental concerns (dust, vibration, noise).

• Safety and cost.

Safety Precautions Before Demolition

• Conduct structural assessment.

• Remove hazardous materials.

• Erect barriers and warning signs.

• Inform nearby residents and businesses.

During Demolition

• Workers must wear PPE (helmets, boots, goggles, gloves).

• Maintain a safe distance.

• Avoid working in unstable sections.

• Use water sprays to minimize dust.

After Demolition

• Inspect debris for reusable materials.

• Clear site safely and dispose of waste properly.