Safe and efficient building demolition requires careful planning. Determining how and when demolition work is to be done is especially critical when extremely hazardous conditions or unique circumstances are present. Demolition planning is especially crucial for projects in which the removal of materials poses risks to the safety of people or adjacent property. Therefore pre-considering the demolition process is very important. The following considerations may necessary to pre consider the demolition process of high rise building; Controlling legislation- A person who fails to give notice to the local authority is liable on summery conviction to a fine. Type of construction- The structural systems and materials used in a structure to be demolished are important factors in determining the demolition approaches, methods, and procedures suitable for a project. Some projects require special consideration. Such as, projects that involve removal of post tensioned concrete members and projects that include demolition in historic structures. Selective removal of building components in a way that protects remaining portions of the structure is another type of demolition that requires careful consideration of construction systems and materials in the demolition planning process.
Safety issues- Before demolition process, contractor must consider about the condition of the floors, framing, and walls of buiding to prevent a possible premature collapse of the structures. Planning the wreckage of the structure, the equipment to do the work, informing worker of hazards and safety requirements, and public safety are some issues should be considered. Contractor should inform about to Medical Services and First Aid, Police and Fire rescue services. They also should plan about using equipments such as specific respirators,safety nets, fall protection, eye and face protection and any other hazard protection device needed for the job. Cost- As with all aspects of construction, cost of a demolition project can be of great importance to the success of the project. The most effective way to keep demolition costs to a reasonable level is to develop a complete, realistic plan and associated specifications for the work. Reducing the unknowns is an important thing. Site access- Downtown areas populated by high-rise buildings often present significant site access problems. Frequently, mobilization and erection of scaffolding needs street closures, traffic revisions, and construction of temporary protective structures. Also, access to locations in difficult terrain may require construction of roads, work platforms, and methods of access for heavy equipment and trucks before demolition can begin.
Protection of adjacent structures- Demolition projects in solid urban areas mandate protection of property adjacent to the proposed demolition work. As well as the choice of demolition method is greatly affected by the proximity of structures that are to remain. Such as, some high-rise buildings cannot be demolished using explosives because of the location of nearby buildings or underground utilities.
Environmental impact- Thinking about environmental impacts is very important before the demolition. It will help to do demolition properly. A life cycle assessment may consider impacts associated with building materials such as their acquisition; manufacture and transport; installation, use, and maintenance; and demolition, disposal, and reuse. Safe demolition Process of high rise building located at city center Points that we should consider in safe demolition process;
•identify the type of high risk construction work being done
•specify the health and safety hazards and risks arising from that work
•how the risks will be controlled, and
•how the risk control measures will be implemented, monitored and reviewed We can do safe demolition with following steps First of all should be Fence and cover the demolition site. Covering the whole building with special sackcloth to protect the perimeter from falling rubble is necessary. Effective traffic management systems are essential on site, to avoid putting workers at risks of being hit by vehicle turning, slewing, or reversing.
Managing Safety-
•uncontrolled structure collapse- demolition work needs to be do and undertaken so as to achieve the controlled demolition of a structure
• Should give attention about essential services, including the supply of electricity, water, sewerage, telecommunications, gas, chemicals, fuel and refrigerant in pipes or lines – the exact location of these and other underground service, such as drainage pipes, soak wells, and storage tanks, and those should be managed during demolition process. Before the start demolition begin, Should remove all the services installed in the building.
•Falls from heights- During demolition and dismantling, workers can be injured from edges, through openings, fragile surfaces and partially demolished floors. In safe demolition process, Responsible persons should give safety equipments to workers for avoid these hazards.
•traffic management- Effective traffic management systems are essential on site, to avoid putting workers at risks of being hit by mobile plants, vehicle turning, slewing, or reversing. Where possible, should Prepare and implement workplace traffic management plan and make available to workers; following safe methods are suitable for demolition in city center. Those are, exclusion zone for mobile plant to be clearly identified and controlled during vehicle loading/unloading operations and dedicated, trained road traffic controllers to direct traffic entering and leaving site and control traffic (pedestrian and vehicle) on adjacent pedestrian footpaths and roadways.
•Injury from falling materials- workers and passers-by can be injured by the premature and controlled collapse of structures, and by flying debris. using hard helmets, covered walkways, using high reach machines can be avoided these hazards.
Safety issues- Before demolition process, contractor must consider about the condition of the floors, framing, and walls of buiding to prevent a possible premature collapse of the structures. Planning the wreckage of the structure, the equipment to do the work, informing worker of hazards and safety requirements, and public safety are some issues should be considered. Contractor should inform about to Medical Services and First Aid, Police and Fire rescue services. They also should plan about using equipments such as specific respirators,safety nets, fall protection, eye and face protection and any other hazard protection device needed for the job. Cost- As with all aspects of construction, cost of a demolition project can be of great importance to the success of the project. The most effective way to keep demolition costs to a reasonable level is to develop a complete, realistic plan and associated specifications for the work. Reducing the unknowns is an important thing. Site access- Downtown areas populated by high-rise buildings often present significant site access problems. Frequently, mobilization and erection of scaffolding needs street closures, traffic revisions, and construction of temporary protective structures. Also, access to locations in difficult terrain may require construction of roads, work platforms, and methods of access for heavy equipment and trucks before demolition can begin.
Protection of adjacent structures- Demolition projects in solid urban areas mandate protection of property adjacent to the proposed demolition work. As well as the choice of demolition method is greatly affected by the proximity of structures that are to remain. Such as, some high-rise buildings cannot be demolished using explosives because of the location of nearby buildings or underground utilities.
Environmental impact- Thinking about environmental impacts is very important before the demolition. It will help to do demolition properly. A life cycle assessment may consider impacts associated with building materials such as their acquisition; manufacture and transport; installation, use, and maintenance; and demolition, disposal, and reuse. Safe demolition Process of high rise building located at city center Points that we should consider in safe demolition process;
•identify the type of high risk construction work being done
•specify the health and safety hazards and risks arising from that work
•how the risks will be controlled, and
•how the risk control measures will be implemented, monitored and reviewed We can do safe demolition with following steps First of all should be Fence and cover the demolition site. Covering the whole building with special sackcloth to protect the perimeter from falling rubble is necessary. Effective traffic management systems are essential on site, to avoid putting workers at risks of being hit by vehicle turning, slewing, or reversing.
Managing Safety-
•uncontrolled structure collapse- demolition work needs to be do and undertaken so as to achieve the controlled demolition of a structure
• Should give attention about essential services, including the supply of electricity, water, sewerage, telecommunications, gas, chemicals, fuel and refrigerant in pipes or lines – the exact location of these and other underground service, such as drainage pipes, soak wells, and storage tanks, and those should be managed during demolition process. Before the start demolition begin, Should remove all the services installed in the building.
•Falls from heights- During demolition and dismantling, workers can be injured from edges, through openings, fragile surfaces and partially demolished floors. In safe demolition process, Responsible persons should give safety equipments to workers for avoid these hazards.
•traffic management- Effective traffic management systems are essential on site, to avoid putting workers at risks of being hit by mobile plants, vehicle turning, slewing, or reversing. Where possible, should Prepare and implement workplace traffic management plan and make available to workers; following safe methods are suitable for demolition in city center. Those are, exclusion zone for mobile plant to be clearly identified and controlled during vehicle loading/unloading operations and dedicated, trained road traffic controllers to direct traffic entering and leaving site and control traffic (pedestrian and vehicle) on adjacent pedestrian footpaths and roadways.
•Injury from falling materials- workers and passers-by can be injured by the premature and controlled collapse of structures, and by flying debris. using hard helmets, covered walkways, using high reach machines can be avoided these hazards.
