Method Statement For Core Cutting Work

Material and Equipment:

1. Core cutter
2. Hammers
3. Screwdrivers (various)
4. Pachometer

Preparation:

1. Make sure all drill areas have been scanned for electric cables;
2. Check all electrical equipment has current safety tags complying with the EHS regulations;
3. Suspend all electric cables safely above floor or ground level;
4. Check all mechanical parts for loose components;
5. Ensure each power cable is fitted with a residual current device (RCD);
6. Erect barricades and clear no-entry signs to areas where drilling is in progress;
7. Isolate the area below drill sites on horizontal slabs, with either a spotter or ‘danger diamond drilling’ signs; and
8. Erect barricades around drill areas.

Operation:

1. Ensure holes have been marked and centres given as per drawing
2. Secure the core drill with anchor bolts using a hammer drill;
3. Ensure the drill machine is solidly fixed, with no movement of the mast. A loose fitting will mean problems down the hole;
4. Attach the drill to the mast, making sure it is secure;
5. Never attach the drill carriage to the mast with the motor running
6. Mark the affected area and scan location for PT tendons
7. Provide Extra support of prop at 600mm c/c for slab.
8. Use 16/20 mm Dia drill bit for drilling in the slab top and 600mm from wall face portion without affecting the reinforcement.
9. Concrete will be cut at a distance of 1 m to 1.3 m from the face of column on all four sides with the help of diamond cutting machine or equivalent as per site conditions
10. The cut concrete will be removed from the place by breaking and debris will be shifted in pre specified location such that the works are not hampered.
11. The cutting and breaking will be done up to the top level of foundation of the respective column. Care should be taken that the reinforcement of the footing of column are not cut during cutting of concrete.
12. Drilling of all holes should start in low gear; stopping the motor before changing to a higher gear;
13. Feed tap pressure water into the hole to bring up slurry and keep the drill bit cool;
14. Fit safety covers over drilled core holes, with warning signs fixed according to the EHS regulations;
15. Remove slurry and cores to prevent slip and trip hazards; and
16. Never drill inverted holes using an electric drill unless the equipment is fitted with a specifically designed water collection ring. Use hydraulically driven equipment as a safer alternative.