Demolition

Definition

          “Demolition is the science and engineering in safely and efficiently tearing down of building and other man-made structure and also carefully preserving valuable elements for reuse purposes.”

Accidental Hazards

• Collapse of structure.
• Fly materials.
• Falling materials.
• Hit by materials.
• Collapse of equipment, machinery, noise, dust, electric shock, explosion, etc.

PPE’s

Gum boots, safety helmet, gloves, nose mask, safety belt, goggles.

Safety Precautions

1. Prior to permitting employee or workers to start demolition an engineering survey shall be done and any adjacent structure where employee exposed shall also be checked. The employer shall have in writing, evidence that such a survey has been performed.
2. A definite Plan of Procedure for demolition work shall be prepared by Contractor and finalized in consultant with competent engineer. A copy of the Survey Report and the Plans / Method of operation shall be maintained at job site for the duration of the demolition operation.
3. Post completion of above-mentioned points Contractor shall implement the plan in actual practice.
4. Any device or equipment such as Scaffolds, Ladders, Derrick, etc., shall be constructed, installed, inspected, maintained and operated in accordance with the regulations governing.
5. Demolition shall be conducted under competent supervision and safe working conditions. Prior commencement of each stage the supervisor shall brief the worker in detail regarding the safety aspects.
6. Demolition in those structure which are damaged by fire, flood, explosion, or other cause shall be shored or braced.
7. All electric (MCB & meters), gas, water and other service lines shall be shut off before demolition starts. These utility services shall be notified in advance.
8. Caution boards and Barricading shall be placed before the operation.
9. All the roads and open areas adjacent to work site shall be protected and Caution Boards / Danger Sign in local language to be displayed. Unauthorized entry shall be efficiently kept under control.
10. Provisions shall be made for at least two independent exits for escape of workmen during emergency.
11. During night, red lights or luminescent sign shall be placed around all barricades.
12. Walkways and passageways shall be provided for workmen, and they will be strictly instructed to use these only. Such walkways shall be kept adequately lighted and free from debris and other materials.
13. Over hanged, Chajjas (heavy roof type) they should be supported properly and demolished first prior demolishing the main structure.
14. Demolition shall always proceed in floor by floor in descending order (top to bottom). Wall shall be removed part by part.
15. While breaking roof slabs, workmen are not allowed to sit on the same floor but on a separate platform and if in case, they must fasten their lanyard or independent lifeline.
16. Debris shall not be allowed to be thrown from height. Removal of debris promptly using by Metal Chutes installed at an angle of more than 45⁰ from top to bottom.
17. Overloading of floor shall be prevented by removing accumulated debris.
18. Only experienced workmen shall be engaged for demolition operation.
19. All material which are removed causes dust formation, shall be sprinkled with water to ossify it.
20. If asbestos, hazardous materials, hazardous chemicals, gases, explosives, flammable materials or similarly dangerous substances found at work site then testing and removal / hazard elimination shall be performed.

Work Permits

Following work permits shall be obtained by Contractor from concerned Engineer:

• Power cutting clearance in ‘Form’ to be issued and Power Clearance in ‘Form’ to be processed.
• Work permit for Gas Cutting & Welding (i.e., hot works) and working at height as may be applicable.
• Work permit for working in gaseous areas if applicable.
• Any other clearance as found appropriate by Superior / Contractor / Engineer should be taken.