The document discusses various methods of demolishing structures, including ball and crane, dismantling, hydraulic breaker, pressure bursting, and explosives. Ball and crane uses a large wrecking ball to demolish structures, dismantling involves carefully cutting and removing elements with a crane, hydraulic breakers are large jackhammers used for demolition work, pressure bursting uses hydraulic pressure or chemicals to split concrete, and explosives can strategically implode structures in seconds while minimizing damage to surroundings. The conclusion states that controlled demolition techniques allow for safe, economical, and rapid demolition with minimal environmental impact.

1. SUB:- Rehabilitationof Structures
Topic :- Method of Demolition of Structures

2. OBJECTIVES :-
Prevention damaging the neighbourhood environment.
Repair of damaged structures.
Construction of other structure at that previously constructed
site.
Provides safety for the occupants in the building.

3. METHODS OF DEMOLITION:
A. Ball and crane
B. Dismantling
C. Hydraulic breaker
D. Pressure bursting
E. Explosives

4.  Ball and Crane
o This is one of the oldest and
most commonly used
methods for building
demolition. A crane uses a
wrecking ball, weighing up to
6120 kg, which is either
dropped onto or hit into the
element to be demolished.
o To demolish roofs and other
horizontal spans.
Wrecking ball at rest
Swinging the wrecking ball

6. Dismantling
Selective or complete demolition of
concrete structures is possible by
cutting elements and then
removing them with a crane.
these methods have particular
application when the objective is
partial demolition .
Dismantling a beam

7. Water Jet cutting
Thermal Lance
Sawing method

8. Hydraulic breaker
Hydraulic breaker
• A hydraulic jackhammer, typically
much larger than portable ones,
may be fitted to
mechanical excavators or
backhoes and is widely used for
roadwork, quarrying ,general
demolition, construction
groundwork & mines .
• The hydraulic breakers have
tremendous power output also
means they are the most power
efficient, getting the most work out
of the available energy.

9. Pressure bursting
• Pressure bursting can be used
in cases where relatively quiet,
dust-free, controlled demolition
is preferred.
• Both mechanical and chemical
pressure bursting split the
concrete, either with a splitting
machine operating on hydraulic
pressure.
Pressure bursting

10.  Explosives
• In the controlled
demolition industry, building
implosion is the strategic placing
of explosive material and timing of
its detonation so that a structure
collapses on itself in a matter of
seconds, minimizing the physical
damage to its immediate
surroundings.
• Demolition of structures, such
as bridges, smokestacks, towers,
and tunnels.
RDX-based explosive
compounds expand at a very
high rate of
speed, up to 27,000 feet per
second (8,230 meters per
second)

11. Building Implosion Blasting in Tunnel
Explosion to Bridge

12. CONCLUSION
• It can be concluded that demolishing/imploding the building
structure will prove very useful, economical and quickest for
reconstruction.
• Leads to a safe and controlled demolition for the occupants
and neighbourhood.
• Development in techniques allows rapid demolition with no
harm to the environment.