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Double-walled casings are used for stabilising boreholes in collapsible soil conditions. Casing and joints are designed for resisting the forces of rotary drilling-rigs or casing oscillators.
| D (mm) | d (mm) | h (mm) | Teeth quantity (pcs) | Weight (kg) |
|---|---|---|---|---|
| 620 | 540 | 586 | 9 | 280 |
| 750 | 670 | 586 | 10 | 335 |
| 800 | 720 | 586 | 11 | 368 |
| 880 | 800 | 586 | 13 | 408 |
| 900 | 820 | 586 | 14 | 419 |
| 1000 | 920 | 586 | 15 | 468 |
| 1180 | 1100 | 586 | 17 | 557 |
| 1200 | 1120 | 586 | 18 | 567 |
| 1300 | 1220 | 586 | 19 | 615 |
| 1500 | 1420 | 586 | 22 | 1023 |
| 1800 | 1720 | 586 | 26 | 1235 |
| 2000 | 1880 | 586 | 30 | 1796 |
| 2500 | 2380 | 848 | 38 | 2261 |
| Casing Pipe φ (mm) | D (mm) | B (mm) | Height H (mm) | Weight (kg) |
|---|---|---|---|---|
| 620/540 | 70 | 848 | 1794 | 679 |
| 750/670 | 70 | 848 | 1794 | 759 |
| 800/720 | 70 | 848 | 1794 | 816 |
| 880/800 | 70 | 848 | 1794 | 870 |
| 900/820 | 70 | 848 | 1794 | 894 |
| 1000/920 | 70 | 848 | 1794 | 1015 |
| 1180/1100 | 70 | 848 | 1794 | 1202 |
| 1200/1120 | 70 | 848 | 1794 | 1235 |
| 1300/1220 | 70 | 848 | 1794 | 1343 |
| 1500/1400 | 70 | 848 | 1794 | 2019 |
| 1800/1700 | 70 | 848 | 1794 | 2580 |
| 2000/1880 | 70 | 848 | 1794 | 3673 |
| 2500/2380 | 70 | 848 | 1794 | 5072 |
| Diameter (mm) | Connection | Bucket Height (mm) | Bucket Wall Thickness (mm) | Base Plate Thickness (mm) | Cutting Plate Thickness (mm) | Teeth Quantity (pcs) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| φ600 | Bauer | 1200 | 16 | 40 | 50 | 3 | 790 |
| φ800 | Bauer | 1200 | 16 | 40 | 50 | 5 | 1020 |
| φ1000 | Bauer | 1200 | 16 | 40 | 50 | 7 | 1280 |
| φ1200 | Bauer | 1200 | 16 | 40 | 50 | 11 | 1680 |
| φ1500 | Bauer | 1200 | 16 | 40 | 50 | 12 | 2240 |
| φ1800 | Bauer | 1000 | 16 | 50 | 50 | 14 | 3015 |
| φ2000 | Bauer | 800 | 20 | 50 | 50 | 16 | 3795 |
| φ2200 | Bauer | 800 | 20 | 50 | 50 | 18 | 4850 |
| φ2500 | Bauer | 800 | 20 | 40 (box type) | 40 (box type) | 20 | 5960 |
| Type | D (mm) | B (mm) | Weight (kg) |
|---|---|---|---|
| A | 74.5 | 38 | 1 |
| B | 98.5 | 59 | 3 |
| D1/D2 (mm) | H (mm) | b (mm) | n (pc) | Hole (pc) | Bolt Type | Weight (kg) |
|---|---|---|---|---|---|---|
| 620/540 | 350 | 40 | 8 | 8 | A | 233 |
| 750/670 | 350 | 40 | 10 | 10 | A | 285 |
| 800/720 | 350 | 40 | 10 | 10 | A | 304 |
| 880/800 | 350 | 40 | 10 | 10 | A | 333 |
| 900/820 | 350 | 40 | 10 | 10 | A | 341 |
| 1000/920 | 350 | 40 | 10 | 10 | A | 381 |
| 1180/1100 | 350 | 40 | 12 | 12 | A | 438 |
| 1200/1120 | 350 | 40 | 12 | 12 | A | 450 |
| 1300/1220 | 350 | 40 | 12 | 12 | A | 483 |
| 1500/1400 | 480 | 50 | 12 | 12 | A | 950 |
| 1800/1700 | 480 | 50 | 16 | 16 | A | 1146 |
| 2000/1880 | 480 | 60 | 12 | 12 | B | 1745 |
| 2500/2380 | 480 | 60 | 16 | 16 | B | 2197 |
Double-walled casings are primarily used to stabilize boreholes in collapsible or unstable soil conditions, protecting the hole from caving in during rotary drilling operations.
Casing drive adapters transfer high torque and rotational force directly from the rig's rotary drive onto the top of the casing string to efficiently advance the casing into the ground.
There are two types of bolt connection systems available: manual mechanical connection, where bolts are tightened by hand, and automatic locking devices for faster operation.
The tooth quantity increases with the casing diameter. It ranges from 9 teeth for smaller diameters (620mm) up to 38 teeth for larger casings (2500mm) to ensure efficient cutting through soil and rock layers.
Type A bolt connections have a diameter of 74.5mm and weigh 1kg, while Type B connections are heavier at 3kg with a larger diameter of 98.5mm to accommodate higher torque loads.
Yes, the boring buckets and joint systems are standard-engineered to match Bauer connections, facilitating seamless integration with mainstream rotary drilling rigs.
