Here are some takes that we follow when core drilling at Giltha. Task steps are listed in the order in which they must be completed. Key steps must be followed in the order presented to achieve maximum efficiency in safety, production, quality and overall loss prevention.
This is a three-person job:
- One person to operate the drill.
- One person to vacuum up water dust mixture and ensure that the water supply tank is kept properly pressurized.
- One person as a “spotter” located on the next floor down to spot the pilot hole location, keep any other people out of the area, and deal with core once it comes free.
Locating Spot For Drilling
- Identify as the spot for drilling.
- Use the M12 Sub-Scanner to detect any danger in the hole location.
- Send a “spotter” to the floor below to watch for the exit point of the pilot hole.
- Drill pilot hole to confirm where the exit point will be and to avoid being close to walls, electrical fittings, lighting fixtures, etc.
- Use HEPA vacs at drill location and at the location of the exit point of the pilot hole to collect silica-containing dust.
- Plug pilot hole.
Drilling Core Hole
- Erect barricades around and well back from the work area.
- Post signs indicating that there is a danger and that there is no entry to the area.
- Erect barricades and warning signs around the area where the “spotter” will be working on the floor below.
- Ensure that all power cords are kept clear of any water.
- Drill a hole for the drop (expansion) anchor and vacuum up dust and water with a HEPA vac as you are drilling.
- Use a “Blow Ball” to clear all dust from the drop anchor hole to ensure that the drop anchor will be as secure as possible.
- Put drop (expansion) anchor in the hole and set (activate) the anchor.
- Place the threaded rod in the anchor.
- Secure drill stand to anchor using appropriate washer and nut.
- Level stand using the adjustment screw in each corner of the stand.
- Set up a drill according to the manufacturer’s directions.
- Equipment plugged into a wall outlet must be unplugged and properly locked out, as defined in the FM Lock Out Program, before any attempt is made to repair, service, clean, change bits, or perform any other activity where an employee may be injured as a result of the equipment being energized.
- Never install the drill on the mast when the motor is running.
- Set up the water supply tank.
- Pressurize the water supply tank.
- Ensure that all equipment is properly set-up.
- The employee that operates wet vacuum must ensure that the water supply tank is kept at the correct pressure during drilling operations.
- Never drill inverted holes using an electric drill unless the drill is fitted with a specifically designed water collection system.
- Fit safety covers over core holes.
Set-Up for Spotter
- Set up scaffolding at the correct height in order to safely control core when it comes free of hole.
- Only work from a ladder if a scaffold cannot be set up in the work area.
- If using a ladder install an expansion anchor in the floor slab that is capable of accommodating fall arrest gear.
- Employee catching core while on a ladder must wear fall arrest gear and be hocked into anchor bolt in-floor slab.
- Use HEPA vac to collect dust from the pilot hole. Housekeeping
Giltha core drilling is one of the best core drilling services providers based in Johannesburg. We have completed more 2000 jobs since our establishment in 2009 and we believe in doing it right the first time. Click here for more