Brisbane concrete core drilling is an effective method for removing any thickness of concrete when other methods cannot be applied. Core holes are drilled in a series of overlapping holes around the perimeter of the desired area to be removed. This only becomes necessary if the concrete is too thick or if space restrictions don't allow the other specialty tools.The drilling rigs are small, can be mounted on a single truck, freely moved to desired location. Depths of 7,500 feet are possible, if you start with a large size drill and reduce the size as the drilling progresses. A drill rod string and bit can be left in place and a smaller size started through it. When the hole is completed, the drill rod strings are removed a casing is installed, or the hole is cemented and abandoned, depending on its purpose.
Diamond concrete-core drills are the most commonly used tools for this process. The core drill bit tends to consist of a steel tube impregnated with diamond segments on the drilling end. The concrete coring drill is mounted on the rotating shaft of a concrete core-drilling machine and is secured to the wall or floor in question. A solid cylindrical concrete core or “slug” is removed from the hole once the drilling is complete.
Diamond Core Drilling is dust-free, quiet and capable of cutting through steel reinforcing rods with little difficulty. Unlike rotary percussion tools, there is no vibration when core drilling and consequently, no structural damage because reinforcing rods are not loosened.
Drilling Reinforced Concrete Surface
Drilling through reinforced concrete surfaces can be difficult and takes longer than other concrete and allied material.
For this, the core drilling procedure is adopted. This is where the steel bar of reinforced concrete is drilled through by fine diamond crystals in a machining mode. However, it puts a high strain on the diamond core bit as steel is a relatively ductile and very tough material.
When the core bit rotates against the same section of drilling surface, it encounters concrete that’s more brittle than before. This facilitates loading and unloading of diamond crystals and bond materials.
Drilling Non-reinforced Concrete Surface
Drilling through plain concrete is relatively different from that of reinforced concrete. However, the core drilling method can also be used in cutting holes of any diameter through non-reinforced concrete surfaces.
Here, the concrete material is removed or drilled through the process of crack propagation. Diamond in the core bit generates stress on brittle non-reinforced concrete that creates a crack on the surface. The cracks are caused when the concrete is broken away from base material, allowing the core bit to drill through the material efficiently.
Concrete core drilling is used for creating circular openings for plumbing, as well as for structural and electrical installations. Brisbane concrete core drilling is designed to remove the perimeter of the hole, an annulus of material rather than an entire cylinder of the material being drilled. The material left inside the drill bit is referred to as the core.
