NZCSDA Concrete Drilling
Concrete core drilling is used to form penetrations in concrete precast panels, blockwalls, beams or concrete floors to allow plumbing service pipes, electrical conduits and air conditioning units to pass through. Hole sizes range from about 12mm in diameter up to 1200mm in diameter.
Specialised deep core drilling can form a hole in excess of 30 metres deep. This type of drilling is typically used to form a precise round hole in concrete or masonry for the insertion of services or reinforcing. Often during seismic upgrades deep core holes are required inside the walls of buildings so that post tensioned rods can be grouted into the wall. A drill is used to remove a cylinder of material, called a core. Usually diamond core drills are used in order to best cut through the concrete and additional material. This technique of concrete cutting is often used for:
- Walls, floor slabs, and ceilings for electrical and communication services, cabling, plumbing, or HVAC
- Slab and roadway holes for doweling drilling, rebar tie-ins, or drainage
- Recessed lighting and fixtures
- Sample and analysis of material