Bulroc CDS 745

Concentric Overburden Drilling System

Drilled Hole Diameter 33.07" -- Casing Size 32.01" O.D. x 30.71" I.D.

Technical Specifications

The CDS 745 is a Concentric Overburden Drilling System designed for the continuous casing of a 33.07" diameter hole, through loose overburden materials down into solid bedrock. The CDS 745 comprises the Driver, which is available for drilling with 24" hammers, together with a replaceable Pilot Bit and 3 replaceable Segments. The current CDS models now have the option of being supplied with a replaceable Drive Shoulder.

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 33.07". The CDS 745 can be withdrawn through the casing by rotating the System anti-clockwise against the solid base of the hole.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.

		Component Parts
		Reference	Description
		1	Driver
		2	Pilot Bit
		3	Segments (4)
		4	Drive Pins (4)
		5	Retaining Pins (2)
		6	Retaining Pin Circlips (2)
		7	Drive Plates (N240)
		8	Footvalve (N240)
		Specifications
		Major Body Diameter	30.53"
		Length (less footvalve)	54.45"
		System Closed	29.37"
		System Open	33.07"
		Casing Size	32.01" O.D. x 30.71
		Total Weight N240 Shank	6380 lbs.