demolition.ppt
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Safe demolition requires adequate planning to identify hazards, meet legislative requirements, and ensure appropriate equipment and methods. Key areas for planning include the type of construction, structure details, state of the structure, hazards, services, and site access. Demolition techniques include sequential or induced collapse. Methods are manual using hand tools, mechanical using equipment, or explosives used by competent persons following strict safety precautions. Regulations require demolition supervision, exclusion zones, signage, service disconnection, and floor-by-floor demolition from the top down. Hazards include falls, impacts, manual handling, substances, noise, electricity, and fires.
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- 2. SAFE DEMOLITION REQUIRES ADEQUATE PLANNING Why Plan? Identify the Hazards Meet Legislative Requirements Ensure Appropriate Equipment Ensure Safe Disposal of Materials Determine Appropriate Methods of Demolition Determine Cost of Demolition
- 3. SAFE DEMOLITION REQUIRES ADEQUATE PLANNING Key Areas for Planning Type of Construction Type of Structure (Ht., Use) State of Structure Structural Hazards Hazardous Substances Location of Services General Conditions of Adjoining Structures Access and Egress Suitability of Site for Equipment
- 4. DEMOLITION TECHNIQUE Sequential – gradual reduction of height in reverse order to its construction Induced – key structural members are weakened or removed, causing the whole part of the structure to collapse
- 5. METHODS OF DEMOLITION Manual – use of hand held tools Mechanical – use of heavy equipment, wires and chain, power shear, etc. Explosives – use of explosives
- 6. RULE 1417 - 1418: DEMOLITION 1. Structures over 6m high must be under the supervision of a competent person 2. The area is strictly for demolition workers only (Demolition area - w/in a distance equal to 1.5 x H of structure) 3. If the above distance is not possible, the structure shall be fenced around 4. Danger signs should be posted around the structure 5. Ensure all electrical services are cut-off
- 7. RULE 1417 - 1418: DEMOLITION 7. Demolition should proceed storey by storey, in a descending order; work on the upper floors should be completely over before removing the supporting members on the lower floor 8. No part of the structure shall be overloaded w/ debris or mat’ls. 9. Stairs (incl. railings), passageways & ladders should be demolished last
- 8. HAZARDS ASSOCIATED WITH DEMOLITION Falls Being Hit/Trapped/Crushed by Objects Manual Handling Hazardous Substances and Dangerous Goods Noise and Vibration Electric Shock Fires and Explosions Equipment
- 9. EXPLOSIVES By Competent Person Precautions from: Smokes, matches & open flames Radio Frequency for Electrical Detonators Transport of Explosives Vehicles shall have tight floors covered w/ wood Explosives and Blasting implements shall not be transported with other materials
- 10. EXPLOSIVES Storage All explosives must be accounted for Follow manufacturer’s instructions Detonators should be stored in a separate magazine Storage should be fire and bullet-resistant Proper Use Operation between Sunup & Sundown Precaution on the use of f mobile radio transmitting equipment. Suspension of operation during electrical storm
- 11. EXPLOSIVES After Blasting Disconnect firing line from blasting machine Allow dust and smoke to subside Inspect if all charges have been exploded