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DEMOLITION
OF
STRUCTURE
Prepared By
Adib Ashhab Ankon
Sanjoy Das
Md. Tajkir Musaddik
Demolition Of Structure!!!
What Is It ???
Demolition is a kind of deconstruction which
involves taking a building apart while
carefully preserving valuable elements for re-
use purposes.
Methods Of Demolition
.
Non-Explosive Demolition Explosive demolition
Non-Explosive Demolition Method
Sledge Hammer Excavators And Bulldozers
Wrecking Balls High Reach Excavators
Explosive Demolition Method
The process of demolition of a building using
explosives. If the supports of the building are
removed, the structure collapses.
Steps Before Demolition
Surveying
Removal of hazardous materials
Preparation of plan
Safety measures
Steps During Demolition
• All cantilevers structures shall demolished first.
• Before demolishing roof , all water tanks and lift rooms shall be
demolished.
• Demolition of floor slab shall begin at mid span and proceed
towards the supporting beams.
• The order of demolition of floor beams shall be as follows:
Cantilever beam
Secondary beam
Primary beam
Non load bearing walls and partition walls shall be
removed prior to demolition process.
• Columns and load bearing walls shall be demolished after removal
of beams on top.
Steps After Demolition
Reuse, Recycle MaterialsStay Put And Rebuild
Factors Affecting Demolition
• Type of structure
• Size of structure
• Available time period
• Location of structure
• Limitation of noise, dust and vibrations
• Skill of workers
• Safety
• Availability of equipment
Side Effects Of Demolition
Demolition Dust
Noise Pollution
Unexpected Risk
BENEFITS OF DEMOLITION
 Economical
 Conserve natural aggregate
 Use of construction waste
 Protection of environment
 Avoids Excess Land filling
Demolition In Bangladesh
 The works often start without any survey and
examination.
 There is no deliberate arrangement for
demolition.
 Occur various electro-mechanical hazards injury.
Methods Of Demolition Comparing
Developed World With Bangladesh
• Mostly we use HAND DEMOLITION
• Recently mechanical methods are seen
Methods Of Demolition Comparing
Developed World With Bangladesh
RISKS EVERYWHERE
• Death of workers.
• Hand Arm Vibration Syndrome.
• Hearing Problems.
• Respiratory Diseases.
CONCLUSION
advantages as well as disadvantages
We need to be more advance
Must maintain rules and regulations
demolation of structure

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demolation of structure