Concentric Overburden

Designed for large diameter holes for foundation, geothermal and water well drilling.
Bulroc has developed a range of Concentric Overburden Drilling Systems for the continuous casing of medium to large diameter holes – up to 850mm diameter. The equipment gives excellent performance for drilling through loose overburden materials down into solid bedrock. At the start of the drilling operation, the segments are in the closed position to allow the system to pass through the lead casing and seat against the casing shoe. When drilling commences, the segments swing out to drill the hole to the desired diameter. The machines can be withdrawn through the casing by rotating the System anti-clockwise against the solid base of the hole or up against the casing shoe.

Drilling through loose material such as sand, clay or boulders can be problematic. Most of the Earth’s surfaceis covered by this overburden material that may often collapse behind the drill bit resulting in loss of the hole and potential loss of the drill string.
Bulroc’s concentric overburden drilling system range has been designed to allow continuous casing of a hole,through loose overburden material, down to and into solid bedrock . The CDS-R is the ideal overburden drilling system for many ground engineering applications including well drilling, underpinning, anchoring and piling. The extended pilot bit design of the CDS-R helps to maintain a straighter, more accurate, hole which is essential, particularly in angled holes.
The CDS-R is available in different sizes to suit a wide range of DTH hammers and, for optimal performance, the CDS-R can be paired with one of Bulroc’s Hyper hammer series.

* Continuous drilling & casing system.
*Ÿ Available in sizes from 235mm to 745mm.
* Designed for lower maintenance costs.
Ÿ* Improved hole alignment.
Ÿ* Easy to replace ring & segments.
Ÿ* Recommended for piling & foundation work.
Ÿ* Different shank types available to suit most DTH
hammers.

CONCENTRIC OVERBURDEN SYSTEMS

DEPTH

CONCENTRIC OVERBURDENSYSTEMS PRODUCT RANGE BROCHURE

CONCENTRIC OVERBURDEN SYSTEM CDS235R BROCHURE

CONCENTRIC OVERBURDEN SYSTEM CDS240R BROCHURE

CONCENTRIC OVERBURDEN SYSTEM CDS280R BROCHURE