Drill Systems

The reverse flood drilling method with rotary head is a straightforward and effective way to drill large-diameter deep holes, on land and off shore. Because the hole remains flooded it is a very stable method in unforgiving rock formations.

Under-reaming bits and ring bits are used for drilling through overburden and unconsolidated ground. Some systems are recoverable while others are permanent; there are various trade names and products on the market.

We have many limited-access drills to suit low-headroom locations, and installations next to property lines or existing buildings. We have a proven track record drilling under power lines, up to sensitive existing structures and buildings, up to property lines, and also into remote locations.

We can drill augercast and rock socketed drilled shafts in limited-access locations.

The down hole hammer is located directly behind the down hole hammer bit. The driller transfers feed force, and some rotation, to the bit through the drill pipe and top drive.

Reverse Circulation, or RC Drilling, is a clean and environmentally friendly method of deep foundation installation. It employs dual-wall drill rods, comprised of an outer drill rod with an inner tube (Figure 1). As the sections of drill rod are screwed together, the inner tubes overlap and seal with O rings. This provides a continuous path for the drill tailings to be transported from the bit face to the surface.

Dual Rotary Drill systems use a lower rotary drive to advance casing through unconsolidated overburden and, where applicable, socket that casing into bedrock. Rotational forces are transmitted through the lower rotary to the casing, carbide-studded shoes or weld-on bars enable the casing to cut through the overburden boulders and bedrock. A reverse-circulation top drive rotary head and drill string simultaneously rotate to drill inside the casing. The drill string is equipped with either a down-the-hole hammer or a rotary bit to remove material and bring it to the surface.