The demolition requirements shall be as per the standards of AS 2601-2001 which recommends specifications for and statements created by industrial liberty and management plan. The other standards for demolition work include safe work NSW demolition licensing, Safework NSW Friable asbestos licensing work health and safety acts, and regulations 2011. Protection of environment operation under various trades like operation act 1997, regulation act 2005, and noise control regulation act 2005. Some of the code practices included the Demolition work code of practice, AS 4361.2, and AS 3000. AS iso 14001 – 2004 for environmental management systems. For matters like workplace injury and diseases AS 1885.1 – 1990 should be used.AS /NZS ISO 9001:1994 is used for quality systems in product installation and service. AS/NZS 4804 and 4581 2001 is used for management and occupational safety and health-related systems and techniques.
Some of the activities that should be followed include Asbestos blueprint NSW, Local govt act, AS 2865-2009 for confined spaces, and AS 1319 Safety signs for the occupational environment. The preliminary investigation may be conducted as per AS 2601: Demolition of structure and work should be acceptable under safe work Australian commissioner. It is necessary to set out requirements for the planned building demolition and the plan may cover all safety precautions and methods for demolition od structures. Manual and mechanical techniques may be employed specifically. The plan may also cover informative appendices and contractual considerations. A checklist may be prepared for contractors and site personals. Other issues to be addressed include all matters related to the health and safety of public and site personals also protective measures for adjacent buildings and environment along with protection of the current construction site.
Demolition process involved is partial demolition process which includes the building elements as follows:
Work Number |
Building/Structure |
Description |
1 |
Site wide |
Disconnection of services like water , power , gas and electricity |
2 |
Site wide |
Material removal |
3 |
Floor level |
Floor level structures may be removed with the help of excavators. |
4 |
Wall level |
Removal of brick walls |
5 |
Framing elements |
Removal of timber framing elements |
6 |
Framings |
Removal of steel frames and battens |
7 |
Roof coverings |
Removal of roof coverings and tiles |
8 |
Other fittings and fixtures |
Removal of windows , fittings and fixtures |
9 |
Structural demolition of buildings |
Hoardings and protective scaffolds may be erected in before demolition worktop and roof structure could be lifted with a crane and remaining structure will be demolished by cut and drop and cut and lift method and mechanical demolition |
Fencing
The perimeter of the demolition zone is to be fenced and proper signposts to be installed as the first activity to prevent unauthorized access. Only concerned officials and authorities related to the project only may enter the site. Within the sites, its necessary to include specific safe zone by flag line, and concerned officials may only enter the site. Visitors shall only be entertained with proper permission and escorts of site officials.
Hoardings
A class B hoarding may be established for pedestrian walkway adjacent to the site. On top of the hoarding, there may be protective scaffolding with a mesh screen that is also to be installed. Spotters shall also be installed at structure side and risk at boundaries may be checked in off-peak times.
Spotters
Spotters may be installed near road and neighbouring buildings. It shall be stationed as per the requirements of concerned authorities to prevent unauthorized access.
Checklist
Before starting the demolition work it is necessary to check items like openings and elevated edges are properly guarded, fire and safety hazards are operational if required and all services are properly and safely disconnected, whether all hazardous materials are properly removed from the site and all communication lines with supervisors and professionals are operational and working as well as emergency access and routes are properly cleared and marked appropriately.
Before leaving the site after demolition it is necessary to check whether all structures nearby are secured and stable, whether all demolished materials and debris are properly cleared from sites and all heat sources are whether extinguished properly as well as emergency routes and access are whether marked. It's also necessary to check the boundaries are secured and unlawful entry is restricted. Also, it is necessary to cross-check the boundaries of the demolished area whether remediation zones are clear and materials re properly guarded and whether zones are marked with hoardings and spotters. A daily meeting is to be conducted with officials and adjacent neighbors regarding the safe disposal of debris from the site.
After preparing the checklist it is essential to check the management plan and study the effectiveness of control along with noise and vibration control with proper dust management. Adjacent areas may be protected properly. It is necessary to get a permit from the concerned authority before the demolition of the structure.
Its necessary to develop site-specific work statement sin before the demolition process and detailed steps may be prepared under safety norms. The scope of work statements includes all those activities that are followed.
As a part of the demolition methodology, it is necessary to check the work permits before the activity commences. The demolition work statement may be certified and specified under AS 2601.
A job hazard analysis shall be developed and work statements shall be initiated by crew members for each activity before the demolition process will progress.
The technology associated with legislation and standards include
Disconnection of services, followed by the erection of hoarding and scaffoldings. It's necessary to remove hazardous material from the site and soft strip installation to buildings along with carport demolition.After providing hoardings and scaffolds in site top roof structure may be lifted and lower to the ground with the help of a crane. The remaining structures including brick walls, timber frames, and windows, etc may be cut and drop and cut and lifted. This method s are evenly followed by mechanical demolition
Sequences of activities include:
A site investigation may be done by addressing the following points
The location of stormwater outlets and establishing control points in sites
Marking appropriate and adjacent roadways and operational areas are clearly defined
Boundaries and adjacent roads and buildings may be protected with hoardings and scaffolding before demolition works
Demolition sequencing includes
Here drop zones are marked along the boundary of building areas are carport, tress and general rubbish from dwelling and outbuilding and sites.
Safety precaution may include conduct of demolition risk assessment workshop (DRAW) which is undertaken
before the demolition process starts to encounter various works
The site team may include professionals like
Construction engineers and Project managers
Site engineers and demolition supervisors
HSEQ officer
Labors and other workers
DRAW with the help of the site team may conduct a job hazard analysis (JHA) to identify various tasks associated with the work statement method. There may be review undergone accordingly
The contractor shall comply with all federal state and health regulations. Contractors shall; establish a safety fence along with the demolition site. Fencing shall prevent pedestrian access to the site. It shall remain in site until demolished materials are transferred from the site. Additional items required include the establishment of sidewalks, pedestrian access, and temporary fencing. The contractor shall be responsible for any damage to sidewalks in sites adjacent to demolition building and the contractor also shall be responsible for any loss and he shall provide proper warning signs, barricades, and temporary sidewalks as suggested by engineers in the site. There may be also provisions for fire extinguishing equipment and hydrants to maintain the correct class and type of fire extinguisher. No materials shall be placed to accumulate fire hydrants. All hydrants shall be properly accessible in sites.
The proposed residence is a one-story timber-framed structure. It consists of brick walls and timber frames connected with steel battens and rafters to support the roof. Building element to be demolished includes roof cladding, roof framing, and support,.Wall framing subjected to – lounge, bedroom 1, bathroom, W/C, laundry, kitchen, passage. The wall to be demolished is made of a brick wall and the framing type is wood and timber framing. Roof members were made up of steel rafters and battens in some areas. Roof covering was made with conventional tiles.
Window, internal plaster linings, fixings, and other fixtures
Floor coverings
Other demolitions are included carport, trees, general rubbish from dwelling and site
The adjacent building supplies authority electrical substation
Signature
Signature of owner or agent
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