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Drilling Systems

Overburden Drilling Systems


Robit ItemsRobit Systems - Since 1985 Robit has been in the front line of drilling business providing high quality drilling tools for mines, quarries and construction sites around the world. Having its roots in Finnish mining industry Robit masters the knowledge of drilling in the most challenging rock types. Still it drives to utilize the experience of the end users to develop even better products with best materials and high precision manufacturing process. Widespread global dealer network guarantees that even the smallest countries receive best customer service available. More holes - more value for the customer has always been the driving force of Robit Rocktools Ltd - the company with faces.

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Overburden Drilling System collage

Symmetrix Systems - The all-in-one Symmetrix design is an ingeniously patented simple concentric method of drilling through overburden using casing. The expediency and high capability of Symmetrix can drill straight holes at any angle whether vertical or horizontal and to a depth of over 100 meters.

All components in the patented Symmetrix system work as one efficient drill bit with features that include:

  • Pilot bit with large internal flushing grooves
  • Symmetrical ring bit (reamer) with internal bayonet coupling
  • Casing shoe for driving of casing
  • Pilot bit is attachable to any common DTH hammer shank or top hammer rod thread


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The Elemex System - Foundation drilling and underpinning work are frequently carried out where existing foundations are sensitive to any kind of disturbance in their immediate surroundings. In those areas, DTH drilling gives one great challenge - controlling the removal of cuttings from the hole with compressed air. The flow of compressed air needs to be strong enough to transport the cuttings up to the surface, but must not escape into the surrounding ground or remove excessive soil. In clay, air from the DTH drilling can escape to surrounding working foundations and weaken the adhesion between soil and load-bearing elements. This brings a risk for sudden settlement. In sand, excessive flushing can unconsolidate the ground, decreasing the capacity of existing friction piles, which in turn might cause pile buckling and result in the settlement of buildings.

The new and reliable Elemex system for controlled flushing was invented by combining comprehensive field experience and testing with airflow simulation and analysis. Together with some of our most dedicated customers, Atlas Copco has designed this product to take on the most sensitive projects, and Elemex is already proving itself in the field.The Elemex System

Conventional DTH drilling systems push air straight into the ground, which is a feature derived from rock drilling applications where the rock face needs as much air as possible to be cleaned efficiently.

The unique concept behind the Elemex design is built on redirecting the airflow. Once the air reaches the bit face, it is blown against the extended ring bit walls, which redirect the flow across the face. This way the air pressure is decreased just enough to allow an efficient flushing of the bit face without escaping to the surrounding ground.

 

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Sim-Cas PhotoThe Sim-Cas System - A continuous casing system was designed to overcome the problems of drilling in soft and loose ground
conditions where a stable cased hole was required. The Sim-Cas system achieves this by enabling the “down the hole” drill string and casing to be lowered simultaneously. A down the hole hammer is used to which is fitted a driver and a one-piece eccentric bit.

The Sim-Cas system has a 3-pin retention system with an eccentric bit to drill a larger diameter than the following casing. Because of the 2-piece design of the driver and eccentric bit, the system is easily retracted and redrawn from the casing and unlike some other systems which have difficulty retracting. The eccentric bit has heavy duty tungsten carbide wear gauge inserts to extend drill bit life. When the eccentric bit extends, the pilot bit centralizes the hammer to help drill straight holes. The large exhaust paths on the eccentric bit help remove drill bit cuttings.

On operating the Sim-Cas system when the eccentric bit extends, the design blanks off the access point of the retention pin on the driver. The Sim-Cas system can be used in any angle from the horizontal.

This system permits the casing to be hammered into the ground. This is achieved by a shoulder on the driver which impacts onto a shouldered casing shoe that is welded to the lead length of casing. With the shoe drive system, the use of a stabilizer is not required.

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Stratex Photo

Stratex Overburden Drill System and Accessories -- The Stratex Drill System (SDS) is an overburden drilling system designed for conditions where a cased hole is required. Collapsing holes tend to make overburden drilling expensive, with lost drilling equipment and down time.

In cooperation with drillers and drilling contractors, the SDS was developed to overcome these problems. The patented eccentric design and the Drop Off Ring (DOR) drill bits enable the drill string and casing to be lowered in the hole simultaneously with a conventional hammer drilling system.

The SDS eccentric designed bit rotates outward and drills a larger diameter hole than the casing, avoiding cave-ins, wash-outs, and other problems common in normal drilling operations in soft and gravel-type strata or loose rock. Since 90% of the world's overburden drilling is in loose strata, potential utilization of the SDS is enormous.

After reaching the designated depth, the SDS reamer-bit is retracted by reversing the direction of the rotation and by applying tension on the reamer-bit, which has a taper and will retract into the casing for easy removal of the entire drill-string. This leaves the casing in place for other applications or for removal at a later date. The SDS method is designed for use with flush joint threaded pipe or welded-type casing and provides a bit size for a wide variety of different casing wall thicknesses.

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Xs SystemXs Drill Systems - This new patented overburden casing system is becoming popular amongst users of both ring bit and eccentric drilling equipment. It is the Easiest and Fastest way to drill and case a hole at the same time in difficult overburden soil. We are offering different systems, depending on if the casing is left in the ground or if it needs to be retrieved, and the depth of the hole and different other variables.

With a variety of casing shoe designs it is adaptable to all casing needs; however, the Xs Drill™ system is found to be particularly useful in deep overburden where rocks and boulders are a problem.

The Xs Drill™ system is simple in operation and has many advantages over conventional techniques: The same large DTH hammer is used for setting and for sub-drilling. For example, when setting 6 5/8" O.D. casing, a full size 6" hammer can be used. The use of a 6" hammer offers advantages over using the conventional 5" hammer, adding more blow energy and greater flushing air at depth. These advantages result in faster drilling and greater depth capability.

When the casing has been set, the same 6" hammer and special 6" diameter drill bit (Square bit™) can be passed through the casing crown to continue drilling a 6" diameter hole to the desired sub-casing depth.

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