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The Flydrill Method

The FLYDRILL method is a completely new concept for bored piling. The drilling unit with rotary head, kelly bar and drilling tool is suspended by the hoist rope of the base carrier crane. The hydraulic power for the drill unit is provided from the base crane.
The drill head is fixed on the casing with a hydraulically operated clamping system during the drilling operation. When emptying the drilling tool, the clamp cylinders are opened and the complete unit is swung sideways.  

 

 

BFD 1500

BFD 2500

BFD 3500

Torque

(kNm)

147

245

392

Stroke crowd cylinder

(mm)

1.000

1.250

1.500

Crowd force (push/pull)

(kN)

2 x 70

2 x 70

2 x 120

Clamping force

(kN)

2 x 230

3 x 230

3 x 230

Casing diameter

(mm)

1.000 - 1.500

1.500 - 2.500

1.800 - 3.500

Kelly outer diameter

(mm)

368

394

470

Weight (w/o kelly bar and tool)

(to)

appr. 5

appr. 8

appr. 15

Drilling depth (depends on base carrier)

(m)

20 - 40

20 - 60

20 - 60

 


Basic data for crane

 

 

 

 

Installed power

(kW)

150 - 200

180 - 250

250 - 300

Hydraulic system
 
 

l/min (bar)
 
 

460 (300)
50 - 200 (250)
35 (300)

500 (300)
50 - 200 (250)
35 (300)

500 (300)
50 - 200 (250)
35 (300)

Winches

(kN)

1 x 150
1 x 150

1 x 300
1 x 150

1 x 300
1 x 150