Hazard:
Sprinkler fitters often core drill through masonry walls and floors for passage of sprinkler pipe.
A primary hazard involved with this procedure is striking utilities concealed inside the wall or floor such as pipe and conduit resulting in water damage and electrical shock.
Damaging electrical conduit can also cause loss of power to vital facility or equipment operations resulting in extensive and costly repairs.
Solid concrete walls and floors are reinforced with metal rebar. When the drill bit hits a section of rebar the drill can seize causing the drill to violently twist in the opposite direction. This may cause injury to hands or wrist if the tool is not held properly.
Preventative Measures:
- Look for plumbing fixtures such as sinks, toilets and water fountains on both sides of the wall.
- Look for pipe, faucets and water connection fittings protruding from wall and above ceiling.
- Locate electrical breaker boxes, wall switches and outlets on both sides of wall.
- Locate conduit on opposite side of wall and above ceiling.
- Look for electrical fixtures such as wall mounted lights, fans, speakers, heaters, etc…
- Interview property maintenance personnel or owner to help locate utilities.
- Review building plans and look for markings, labels or placards on walls.
To prevent injury when drilling: (Used by experienced personnel only)
- Inspect condition of drill and bit.
- Ensure second handle is attached to drill.
- Hold drill with both hands and position body appropriately.
- Secure footing on ladder or lift.
- Take breaks to reduce fatigue.
- Wear proper PPE