Bulroc CDS 280

Concentric Overburden Drilling System

Drilled Hole Diameter 13.39" -- Casing Size 12.76" O.D. x 11.97" I.D.

Technical Specifications

The CDS 280 is a Concentric Overburden Drilling System designed for the continuous casing of a 13.39" diameter hole, through loose overburden materials down into solid bedrock. The CDS 280 comprises the Driver, together with a replaceable Pilot Bit and 3 replaceable Segments.

At the start of the drilling operation, the Segments are in the closed position to allow the System to pass through the casing shoe. When drilling commences, the Segments swing out to drill a hole of 13.39". The CDS 280 can be withdrawn through the casing by rotating the System anti-clockwise against the solid base of the hole. If there is no solid base, the System can be closed by pulling up against the casing shoe and rotating anti-clockwise.

Complete System: SD10

		Component Parts
		Reference	Description
		1	Driver (SD10)
		2	Pilot Bit
		3	Segments (3)
		4	Segment Sleeves (3)
		5	Retaining Pins (2)
		6A	Seloc Pin Outer (2)
		6B	Seloc Pin Inner (2)
		7	Footvalve (SD10)
		Specifications
		Major Body Diameter	11.81"
		Length (less footvalve)	31.5"
		System Closed	11.06"
		System Open	13.39"
		Casing Size	12.76" O.D. x 11.97" I.D.
		Total Weight SD10 Shank	660 lbs.