DEMOLITION:-Demolition is the process of tearing down or falling down of a building after its life period with the help of some equipments or any other method. When explosives are used for this then the demolition process are called as an implosion. Every civil engineering structure is designed for a life period. After that the existence of a structure is very dangerous. So removal of such structures with proper safety measures has got great importance. There are different steps involved before and during the time of a demolition activity.

1. SEMINAR PRESENTATION
ON
DEMOLITION OF BUILDINGS
GUIDED BY:- SUBMITTED BY:-
Dr.AJAY BINDLISH CHANDRA SHEKHAR PRAJAPAT
Associate Professor CRN :- 11/321

2. Introduction
 Deliberate destruction of structures and
materials by means of
 Mechanical Equipments
 Explosives

3. Demolition of
Building

4. STEPS BEFORE DEMOLITION
 Surveying
 Removal of hazardous materials
 Preparation of plan

5. SURVEYING
 Study of different parameters of the
structure and its surroundings.
 Record Drawings
 The construction materials
 Adjoining properties and site conditions
 Available site area to demolition

6. REMOVAL OF HAZARDOUS MATERIALS
 Asbestos containing material
 Soil contamination material

7. PREPARATION OF PLAN
 The location of the building to be demolished
 A layout plan of all floors of the building to be
demolished
 The structural support systems
 Time and frequency
 A temporary parking layout for mobile
machines and trucks

8. Emergency exit
 properly protected
 free of obstruction
 properly marked with exit signs

9. METHODS OF DEMOLITION
PIECEMEAL
DEMOLITION
MECHANICAL
METHOD
EXPLOSIVE
DEMOLITION

10. EXPLOSIVE DEMOLITION
Blasting machines Blasting cap or electrical detonator

11. Advantages of EXPLOSIVE DEMOLITION :-
 Less expensive
 No ground vibrations
 Quickest method
 Suitable for multi-storyed / high piers,
cabins, distressed piers etc.

12. How building implosion works??

13. Placing the Explosives

14. DEMOLITION
Concrete Columns Steel Columns

15. Blasting the Explosives
• Use of blasting caps.
• Lead line.

16. Columns Fully Loaded with
Explosives and Hooked up to
Blasting caps

17. Test Blast

18. CONCLUSION
Demolition method applied in a structure
depends upon various factors such as site
condition, type of structures, age of building,
height of building and economy and most
important its location with presence of its
surrounding with its structural stability.
Controlled demolition of building is necessary
to ensure safety of both the workers and the
surroundings so as to cause least amount of
injuries and accidents.

19. Thank you…