Bulroc (UK) - Eccentric and Concentric Systems
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 The machines can be withdrawn through the casing by rotating the System anti-clockwise against the solid base of the hole or up against the casing shoe. For smaller hole sizes, Bulroc produces the ODS "Eccentric" Overburden Drilling System, starting with the ODS 90 to suit 114mm O/D casings. This two-piece system comprises the Shanked Bit Holder and the Eccentric Bit that is secured in the Bit Holder by a double Seeloc Pin. This is easily removed to allow for Bit re-sharpening or replacement. Bulroc Overburden drilling systems are widely used in a variety of applications from Well Drilling and Mini Piling to Rock Anchoring and Site Investigation.
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