General Description on Demolition

8/6/2019 General Description on Demolition

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GENERAL DESCRIPTION ON DEMOLITION

PEMBINAAN C W YAP SDN BHD (202393-U)

EARTHWORKS, CIVIL & DEMOLITION CONTRACTOR


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General Preparations Prior to

Physical Demolition

Proposed Demolition Sequence and MethodsProposed demolition Sequence and Methods are based on existing building conditions,Demolition Contractors knowledge and experience put into practice along with the necessary

calculations and advise from our Civil & Structural Consultants.

Inspection on Existing Building and Layout DesignAlthough the building is meant for demolition, an inspection on the health of the building is of

utmost importance. Efforts should be made to acquire the structural plans from the owners or

consultants or the archives from local authorities.A site visit/inspection will also be carried outby our team and affiliated professionals.

Safety PrecautionsSafety precautions has to be extensively planned and monitored any kind demolition especially

along the demolition perimeters. Extra precautions has to be taken to ensure that no debris will

be accidently ejected outside of the site into the neighboring tenants boundary as well as into

the public road. The demolition team, consisting of project managers, supervisors, operators,safety officers, etc.. Shall go through an extensive planning hand in hand.

Soft Stripping/Internal StrippingSoft Stripping will be carried out on the existing building to remove and dispose hazardous and

combustible material, ie: glass windows, doors, wooden fittings, roofing, steel members, steel

structures, carpet and etc. This will also control and minimize projectiles from being ejected

during demolition works.


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Preliminary Safety Precautions

Perimeter Hoarding

Perimeter Hoarding of3.6m in height as per DBKL requirement

Additional Hood/Platform to be added due to heavy pedestrian

traffic

Debris Catch Fence

Make shift Debris Catch Fence with 1 layer of

industrial netting and 1 layer of Heavy Duty

Netting at critical zones


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Preliminary Safety Precautions

External Scaffolding

1) 1 layer of Industrial Netting

2) 1 layer of Tarpaulin

3) 1 layer of Heavy Duty Industrial Netting

External A-Frame scaffoldings with 3 layers of

protection to be constructed around structure


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Preliminary Safety Precautions for

High Rise Structures

CRAB60 Propping

Our Professional Engineer(P.E.) will carry out the slab load calculation to cater

to the movement and vibration from the machineries and subsequently to

design the propping and bracing required to back prop the suspended slab. This

will maximize the safety factor and to avoid from any unintended collapse on

any part of the structure during the course of demolition works


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Demolition Sequence

Hoisting of Machineries

The Demolition team and its affiliated professionals, P.E, etc, shall carry out

necessary calculations and survey of site conditions prior to the hoisting of

machineries to the roof of structure .


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Demolition Sequence

Top-Down Demolition

Physical hacking works will be carried out on floor by floor

basis starting with the slab, beam and lastly the columns.

Excavators will be lowered down to the lower floor using a

steel ramp customized to the structures floor height as

shown in the diagram on the right.


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Demolition Sequence

External Demolition

Higher capacity excavators, i.e: EX300 onwards to be utilised for external

demolition.Excavators are usually fitted with either hydraulic breakers or

hydraulic crushers.


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Demolition Sequence

External Demolition & Ground Works

Once the structure is brought down to a safe level using top down demolition,

higher capacity excavators will be mobilized to speed up the demolition process

Upon the complete demolition of the structure, hacking works will be done on

the ground/basement slab, and subsequently the pile caps.


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Debris & Traffic Management

Debris will be transported away from site on a progressive basis.

Warning Signages & Barricades will be placed around perimeter of site.

Traffic management team to be stationed on site to manage traffic

whenever necessary.


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Safety, Health & Environment

Temporary Perimeter Hoarding External Scaffold with 3 layers of protective materials

(Industrial Netting, Tarpaulin & Heavy Duty safety netting)

Safety Toolbox meeting to be

carried out daily.

Water Pump & Hose Jet will be use to contain and

minimize dust derived from demolition works


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THE END

Prepared by,

Andy Yap

Documents

General Description on Demolition