Prepared by DKA6A ( Group 4 )

1. ì
Introduction
Of
Demolition
DKA6A GROUP 4

2. Methods
of
Demolition
ì Manual
ì Mechanical
-­‐Crane
and
demoli1on
ball
-­‐Pnuema1c
impact
tool
-­‐Mechanical
arm
-­‐Explosion
DKA6A GROUP 4

3. Manual
1. INSTALLATION
OF
WORK
SITE
DKA6A GROUP 4

4. REMOVAL
OF
ROOF
DKA6A GROUP 4

5. DISMANTLING
SUPERSTRUCTURES
ì Cut
the
outlets
of
all
the
plant
in
the
building
ì Buildings
demolished
using
iron
hammer
carefully
ì Buildings
un1l
the
fall
DKA6A GROUP 4

6. Mechanical
ì Crane
and
demoli1on
ball
-­‐Crane
and
ball
demoli1on
is
one
of
the
oldest
demoli1on
methods
devised
and
is
s1ll
commonly
used
all
across
the
United
States
v Cheap
v Save
1me
v Less
cost
DKA6A GROUP 4

7. DKA6A GROUP 4

8. Pneumatic
impact
tool
ì Same
as
it
only
manually
demoli1on
using
this
tool
DKA6A GROUP 4

9. Mechanical
arm
ì Using
mechanical
arm
to
demoli1on
building
DKA6A GROUP 4

10. Explosion
ì This
method
is
quite
dangerous
because
the
resul1ng
explosion
DKA6A GROUP 4

11. Kelebihan
dan
kekurangan
pada
setiap
cara
perobohan.
Muhammad
Faiz
Bin
Mad
Sakri
08DKA11F1021
DKA6A GROUP 4
ì

12. Kren
dan
bebola
Kelebihan
Keburukan
ì Cepat
ì murah
ì Perlu
tenaga
mahir
ì Bangunan
untuk
dirobohkan
terhad
ì Bising
DKA6A GROUP 4

13. DKA6A GROUP 4

14.
Letupan
Kelebihan
ì Pekerja
sikit
ì Murah
ì Cepat
ì Tak
bergegar
Kekurangan
ì Memerlukan
ketepatan
masa
ì Debu
banyak
ì Pegawai
yang
mahir
ì Peralatan
sikit
DKA6A GROUP 4

15. DKA6A GROUP 4

16. Alatan
tangan
Kelebihan
ì Serba
boleh
Kelemahan
ì Lambat
ì Cekap
ì Mudah
dikendali
DKA6A GROUP 4

17. DKA6A GROUP 4

18. Hydraulic
arm
Kelebihan
Kekurangan
ì Mudah
ì Lambat
ì Boleh
diubah
mengikut
ì Tidak
sesuai
untuk
bangunan
kesesuaian
bertetulang
DKA6A GROUP 4

19. DKA6A GROUP 4

20. ì
DKA6A GROUP 4

21. Legislative Requirements in Demolition
ì Planning for demolition work - selecting appropriate
methods of demolition & equipment to be used
ì Appointing a competent person experienced in
demolition work to assess & inspect the structure to be
demolished during the course of the demolition work
ì Erecting appropriate hoardings, catch platforms and
overhead protection barriers for protection of the public
& personnel on the site
DKA6A GROUP 4
ì Maintaining security of site.

22. Clear directional sign
Clear directional sign
Overhead protection scaffold
Overhead protection scaffold
DKA6A GROUP 4

23. Safety in Demolition
Preparatory operations including pre-demolition surveys and overall
planning of demolition work covering methods to be used to bring the
structure down
equipment necessary to do the job, & t measures to be
taken to perform the work safely,
DKA6A GROUP 4
All planning work performed by a competent person relevant experience in all stages of demolition work.

24. Hand tools for demolition
DKA6A GROUP 4
Cutting of vertical facade wall panel.

25. Pre-demolition Surveys
Engineering surveys should be carried out
include structural stability, existing services
& presence of hazardous substances
DKA6A GROUP 4

26. Risk
Assessment
Risk assessment to identify hazards
associated with the demolition process,
assess such hazards and take
reasonably practicable steps to
eliminate or control the risks arising
from hazards.
DKA6A GROUP 4

27. Demolition Plan
ì The method statement for demolition works should
clearly indicate the sequence of demolition, approach to
demolition and elements that require specialised
methods of removal. Operators and staff involved in the
demolition works should be well informed and well
versed with how works are to be carried out, the
sequence of such works and the safety precautions to
be taken prior to the commencement4 works.
DKA6A GROUP of

28. Pre-demolition Work
ì Glass and cladding on external walls should be
removed prior to commencement of any
demolition works.
ì Services / utilities should be capped, diverted
or protected prior to the commencement of any
demolition works.
DKA6A GROUP 4

29. Protective Precautions
Machinery / Equipment
ì All demolition equipment should be operated by
competent persons with appropriate training.
These equipment should be used and
maintained as recommended by the
equipment’s manufacturer or supplier.
DKA6A GROUP 4

30. Lifting Equipment
DKA6A GROUP 4

31. Machinery / Equipment
ì Lifting equipment should be thoroughly
examined by an authorised examiner at
least once every 12 months for those lifting
goods or materials or once every 6 months
for those lifting personnel.
ì Only excavators that are originally designed
and manufactured to also function as a
lifting machine can be registered by an
Authorised Examiner as a lifting machine
and be used for lifting purposes.
DKA6A GROUP 4

32. Scaffolding
ì Scaffolds above 4m in height (excluding tower
and trestle scaffolds) should be erected,
installed, added, altered or dismantled by an
approved scaffold contractor.
ì Working platforms should be free from debris
ì Every scaffold should have at least one
designated access point.
ì Care should be taken to prevent damage to
scaffolding components from4
DKA6A GROUP falling debris.

33. Scaffolding
DKA6A GROUP 4

34. Public Safety
ì The demolition site should be properly
barricaded with appropriate warning
signs posted. No unauthorised entry
should be permitted in the demolition
site
ì Hoardings and covered walkways should
be provided in conjunction with catch
platforms to guide pedestrian flow and
DKA6A GROUP 4
protect pedestrian traffic against falling
debris.

35. Well lit covered walkways with
clear signage
DKA6A GROUP 4

36. Worker Safety
ì Workers involved in demolition works must be
provided with appropriate training and
instructions to carry out demolition works
safely.
ì Supervision is needed to ensure that only those
workers who have received training and
instructions are authorised to carry out the
work.
DKA6A GROUP 4

37. ì All personnel assessing the demolition site
must be provided with safety boots and
helmets. Workers should, when necessary, be
provided with appropriate personal protective
equipment such as goggles, hearing protection
devices, safety harness, gloves, appropriate
respirators for dust or chemicals & protective
clothing.
DKA6A
GROUP 4

38. Misting to control dust
DKA6A GROUP 4

39. Asbestos Management
ì When a building or structure is ascertained to
contain asbestos, all asbestos materials should
be properly removed prior to the commencement
of demolition.
ì Asbestos removal should be carried out and
supervised by someone trained in asbestos
removal and management.
ì Demolition contractors should take reasonably
practicable measures to control the release of
asbestos fibres by preventing or minimising
breakage of asbestos materials.
DKA6A GROUP 4

40. Demolition work for specified building
Wrecking
Ball
ì The wrecking ball application consists of a crane
equipped with a steel ball.
ì The destruction of the building is by the impact
energy of the steel ball suspended from the
crawler crane
ì The wrecking ball operates outside the building
ì This method is suitable for dilapidated buildings,
silos and other industrial facilities.
DKA6A GROUP 4

41. Application Criteria
free falling of the wrecking ball
onto the structure.
1.
Ver0cal
Drop
-­‐
2.
Swing
in
line
-­‐
swinging
of the ball in-line with
the jib. A second dragline will normally
connect to the ball horizontally to control
the ball motion. The ball shall be swung
into the building. The ball shall strike at the
top of the member so as to avoid the
member from falling outside the building.
DKA6A GROUP 4

42. DKA6A GROUP 4

43. Environmental effects in demolition work
Air
pollu0on
ì Concrete breaking, handling of debris and hauling
process are main sources of dust from building
demolition
ì Dust mitigation measures complying with the Air
Pollution Control (Construction Dust) Regulations
shall be adopted to minimise dust emissions.
Burning of waste shall not be allowed
ì Diesel fumes generated by mechanical plant or
equipment shall be subject to the control of the Air
Pollution Control (Smoke) Regulations.
DKA6A GROUP 4

44. Noise
ì Noise pollution arising from the demolition works
including, but not limited to, the use of specified
powered mechanical equipment (SPME),
powered mechanical equipment (PME), such as
pneumatic breakers, excavators and generators,
etc., scaffolding, erection of temporary works,
loading and transportation of debris, etc. affects
the workers, and the sensitive receivers in the
vicinity of the demolition site.
DKA6A GROUP 4

45. Hazardous
Materials
ì The asbestos abatement works shall be carried out
in accordance with the Air Pollution Control
Ordinance (APCO) and the Factories and Industrial
Undertakings (Asbestos) Regulations before
demolition
ì Other materials such as LPG cylinders in domestic
flats, toxic and corrosive chemicals for industrial
undertakings, and any other hazardous materials
have to be identified and properly handled and
removed prior to the commencement of the
demolition of the building.
DKA6A GROUP 4