Demolition

DEMOLITION

Demolition

Demolition is the opposite of work with the construction of other structures, demolish buildings @ guardedly & protect valuable

elements for re-used.

INTRODUCTION

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Demolition

DEMOLITION FACTORS

1. Unsafe buildings occupied or used. Example: Building a 100-year-old can be categorized as unsafe to use.

DEMOLITION FACTORS

2. Area of existing buildings to be erected a new building or infrastructure projects to be developed by the government.

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DEMOLITION FACTORS

3. The buildings were built, not according to the in-laws enforced by the Building Act 1974 Local authorities

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DEMOLITION FACTORS

4. Buildings that have been built illegally or without approval from the relevant parties.

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DEMOLITION TYPES

Full Demolition - demolish the whole structure

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Partial Demolition - demolition of certain parts of the building structure

DEMOLITION TYPES

Some factors to be considered are:

(a) Location construction site (For a separate building to be demolished completely, the distance the building with the area near the border must be at least twice the height of buildings called buildings on site.)

Demolition

DEMOLITION TYPES

Some factors to be considered are:

(b) Type structure

(Structure with mainframe, such as two-storey building)

(c) Type of construction

(Material & method of structures construction likes brick wall, precast concrete, pre-stress concrete and steel structure.)

Demolition

DEMOLITION methods

(1)MANUALLY

Demolition carried out in stages, using hand tools.

A tool such as the crane is used to lift and sent down parts have been dismantled or demolished as a tier-by tier.

Part of this was dismantled may be removed directly from the building if the area is the demolition of buildings on the site.

 

Demolition

Minimum distance to the boundary must be greater than 6 m or half the height of the building in which the part is removed.

For limited areas, parts of buildings that have been dismantled shall be sent down by using a crane or hoist (lift).

As a security precaution, net suspended from the building to avoid pieces of flying debris.

Demolition

Demolition of this manual is usually done to buildings that do not have a mainframe built from concrete and reinforced concrete.

For buildings that have a mainframe, another demolition method has to be used.

Weakness: Expensive operating costs Demolition delayed

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(2) MECHANICAL EQUIPMENT

A. CRANE AND BALL

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(2) MECHANICAL EQUIPMENT

A. CRANE AND BALL

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This method is carried out in stages by using steel ball suspended on a crane.

Demolition of two ways, using steel balls which are: A vertical steel ball dropped from the tip

of the crane to the bottom Raise the crane arm that hung ball,

and applying to the building structure. Mobile crane suitable for a vertical 

ball drop method,

(2) MECHANICAL EQUIPMENT

A. CRANE AND BALL

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Whereas, for the side or parallel swingingmethod , larger and heavy cranes can be used because it is not easily overturned.

This method is not suitable to demolishbuildings with a height more than 30m because being able to control the flying debris.

Therefore, the demolition should first do by manually (partial demolition) to separate the parts of the building to be demolished with parts that need to be maintained.

Demolition

Roof frame such as steep roof and  50-70% in the middle of the floor structure, should first manually demolished debris can fall through and be collected locally.

Advantages:i.  Low costii. Quick completed demolition

Disadvantages:i.  Not suitable for building in confined areasii. Dangerous if the crane operator is not skilled or less efficient.

B. PNEUMATIC IMPACT TOOLS

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B. PNEUMATIC IMPACT TOOLS

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Impact hammers normally have a track- or wheel- mounted chassis, an articulated boom, and a heavy duty pick vibrated by hydraulic or pneumatic power to demolish concrete or brickwork. However, a demolition hammer delivers hammering action only, unlike a rotary hammer, which can also be used to bore holes.

B. PNEUMATIC IMPACT TOOLS

Demolition

  What a demolition hammer lacks in this regard in terms of adaptability, however, they make up in punch. The demolition hammer is able to deliver more powerful blows than the rotary hammer, since it typically has about 35% more power. This is due to the fewer parts in a demolition hammer, and sometimes a longer piston stroke, as well.

  While the demolition hammer delivers fewer blows per minute than a rotary hammer, the increased  strength of the tool actually makes it a quicker and  more efficient means of demolishing concrete and  masonry.

C. MECHANICAL ARM

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1) This tool is used to demolish buildings by part.

2) This machine is fitted with a steel sleeve that will produce a horizontal thrust force.

3) It is operated by an operator who is behind the shock-proof glass shield (shatterproof)

4) The machine is placed on a strong base that can bear the burden of reverse thrust.

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5) Machine operating area must be not less than 6 m

6) Height of buildings can be demolished is 6m.

7) The rest of height done by manually demolished.

D. EXPLOSIVE

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1) If explosives are to be used for demolition, the planning and execution, include pre-weakening should be under the control of a person competent in these techniques.

2) For large demolition, the competent person is likely to be an experienced explosive engineer; for smaller work, a short-firer may be sufficient.

3) When the use of explosives is contemplated, it is usual to employ a technique that will ensure the total demolition of the whole building by staging a controlled collapse.

Demolition

1) The explosive charges are set and fired in a sequence that will weaken the structure in such a way that the building collapses in upon itself.

2) Although we tend to think of explosives as devices producing spectacular bomb like explosions, the use of non-explosive is now at an advanced stage.

3) These non-explosive techniques are essentially expanding charges that achieve the same results as explosives but without noise and initial devastating blast.

Demolition

ADVANTAGES:

1) Less workers

2) Cheap material price

3) Vibration due to blasting is considered not as just a few minutes.

4)    Small and lightweight equipment used

LEARN SAFETY PROCEDURES AND BEST PRACTICES OF

DEMOLITION WORKS

Demolition

The Safety Procedure includes:

• Risk Assessments• Pre-Planning• Site Safety• Fall Protection• Chutes• Lift Boxes• Removing Glass• First Aid• Adjoining Buildings

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Asbestos removalTask SequencesSite Clean Up and moreRisk RatingsMS Word FormatThis Is Not A Blank Template

Multiple page procedureDelivered via email within 2 business hours

Site Safety & Security

• Warning signs will be erected and     checked each day.      Example:

 “Warning Demolition Work in Progress”.

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Site Safety & Security..cont.

• Traffic control, road closures and pedestrian controls will be provided as identified and where required.

• Perimeter hoarding fencing will be installed as required.

• Gates will be locked at completion of the work day.

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General Demolition Safety Information:

• Demolition Work can be extremely dangerous and this Safe Work Procedure or Work Method Statement is a vital part of a safe work system.

• Safety Culture procedures are Not Blank Templates. Safety Procedures can be edited or customized in MS Word if required.

• Demolition Work Safety Notes

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Before Commencing Demolition Work:

• Ensure:    Development approval has been granted.    Approval has been granted from the owner to proceed.    Building owner has provided a building report of any  contained asbestos materials

• Review:    Existing plans (if available) to identify structural systems. If plans are not available consult with a structural engineer.   Identify the plant and equipment to be used.

• Identify:   Safe means of access and egress to the site and for adjoining buildings and areas such as common use parks.   Any possible environmental impacts from the demolition.

Demolition