Manual Demolition

1. INTRODUCTION TO DEMOLITION
By Divyang Rathod
Faculty : N. D. Vinzuda sir
J. R. Ardeshana

2. Introduction:
 Branch ~ Civil
 Sem. ~ 6th
 Subject ~ Maintenance and Rehabilitation of Structures
 Subject code ~ 3360605
 Seminar Topic ~ Demolition
 Date ~ 10/01/2017
 Faculty ~ N.D. Vinzuda

3. Demolition:
• Demolition means dismantling, razing, destroying or wrecking any
building or structure or any part of it by pre-planned and controlled
methods.
• When the building is very old and not desirable to take the load any
more, it is necessary to dismantle the structure. A structure should be
dismantled after its design service life is over.
There are two main techniques of demolition
(i) Non- Engineering Demolition
(ii) Engineering Demolition

4. (i) Non- Engineering Demolition:
• This method particularly suitable for use in smaller site with
congested space where larger machine cannot be employed.
• In this case, human operatives are used in the demolition process
using simple electrically or pneumatically powered tools such as
picks, hammers, wire cutters or hand driven hydraulic jacks etc. to
carry out the demolition of individual elements.
• In this method, the sequence of demolition is from top to bottom.
For the demolition of concrete elements like beam, column, slab, etc.
jack hammers are used. Oxy-acetylene torch is used for cutting the
reinforcement.

5. Manual Demolition:

6. Oxy-acetylene torch:

7. Sequence of Demolition:
1. All cantilever structures shall demolished first.
2. Before demolishing roof, all water tanks and lift rooms shall be
demolished.
3. Demolition of floor, slab shall begin at mid span and proceed
towards the supporting beams.
4. The order of demolition of floor beams shall be as follows:
• Cantilever beam
• Secondary beam
• Primary beam

8. Conti…..
5. Non load bearing walls and partition walls shall be removed prior
to demolition process.
6. Columns and load bearing walls shall be demolished after removal
of beams on top.

9. REFERENCES:
• http://www.slideshare.net.html
• Maintenance and Rehabilitation of Structure, by R.P. Rethaliya

10. Thank You