Concentric Casing System with Ring Bits
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Maxdrill’s concentric casing system can be applied to overburden formations with complex topographic and geological conditions, such as gravel, fissure formations, boulder, landfill of construction refuse, etc.
- Straightness: ensures the straightness of borehole in different topographic and geological conditions.
- Adaptability: ensures penetration efficiency in complex topographic and geological conditions, such as gravel and landfill of construction refuse.
- Lower torque: the torque of the concentric casing system is less than eccentric casing system.
- Easy to unlock and re-lock: easy to re-lock after unlock.
- Drilling at any angle: concentric casing system can drill rocks at any angle.
- Environmentally friendly: the concentric casing system is greener than the eccentric casing system as it drills rocks smoothly with less vibration and noise. We recommend the use of the concentric casing system in urban areas.
Casing Shoe
Ring Bit
Pilot Bit
| D | h | H | C | G | ||||
| Part No. | O.D of Casing Tube (mm) | I.D of Casing Tube (mm) | Wall thickness of Casing Tube (mm) | Max. O.D of Pilot Bit (mm) | Reamer Dia.(mm) | Max. O.D of Normal Bit (mm) | DTH Hammer /TOP Hammer Type | Weight (Kg) |
| Top Hammer Type | ||||||||
| MDC76/7RR-01 | 76 | 62 | 7 | 57 | 84 | 39 | R32 | 3.2 |
| MDC89/8RR-01 | 89 | 73 | 858 | 70 | 96 | 58 | T38 | 5.8 |
| MDC114/10RR-01 | 114 | 94 | 10 | 92 | 122 | 80 | T45 | 7.5 |
| MDC127/10RR-01 | 127 | 107 | 10 | 105 | 136 | 90 | T45 | 10 |
| MDC140/10RR-01 | 140 | 120 | 10 | 116 | 148 | 97 | T45/T51 | 15 |
| DTH Hammer Type | ||||||||
| MDC114/10RR-02 | 114 | 94 | 10 | 92 | 122 | 80 | COP34/DHD3.5 | 10 |
| MDC127/10RR-02 | 127 | 107 | 10 | 105 | 136 | 90 | COP34/DHD3.5 | 16 |
| MDC140/10RR-02 | 140 | 120 | 10 | 116 | 148 | 97 | COP44/DHD340 /SD4/QL40 | 21 |
| MDC146/10RR-02 | 146 | 126 | 10 | 124 | 154 | 110 | COP44/DHD340 /SD4/QL40 | 22 |
| MDC168/12.7RR-02 | 168 | 142.6 | 12.7 | 141 | 180 | 125 | COP54/DHD350 /SD5/QL50/M50 | 27 |
| MDC178/12.7RR-02 | 178 | 152.6 | 12.7 | 150 | 186 | 135 | COP54/DHD350 /SD5/QL50/M50 | 32.5 |
| MDC194/12.7RR-02 | 194 | 168.6 | 12.7 | 166 | 202 | 145 | COP64/DHD360 /SD6/QL60/M60 | 42.5 |
| MDC219/12.7RR-02 | 219 | 193.6 | 12.7 | 191 | 228 | 170 | COP64/DHD360 /SD6/QL60/M60 | 58 |
| MDC245/12.7RR-02 | 245 | 219.6 | 12.7 | 214 | 254 | 195 | COP84/DHD380 /SD8/QL80 | 78 |
| MDC254/12.7RR-02 | 254 | 228.6 | 12.7 | 224 | 265 | 203 | COP84/DHD380 /SD8/QL80 | 84.5 |
| MDC273/12.7RR-02 | 273 | 247.6 | 12.7 | 241 | 286 | 223 | COP84/DHD380 /SD8/QL80 | 100 |
| MDC325/12.7RR-02 | 325 | 299.6 | 12.7 | 292 | 338 | 276 | COP84/DHD380 /SD8/QL80 | 135 |
| MDC406/12.7RR-02 | 406 | 380.6 | 12.7 | 377 | 420 | 350 | QL120/DHD112/ SD12/NUMA120 | 280 |
| MDC508/12.7RR-02 | 508 | 482.6 | 12.7 | 478 | 522 | 416 | QL200/SD18/ NUMA180 | 522 |
| MDC560/12.7RR-02 | 560 | 534.6 | 12.7 | 528 | 575 | 475 | QL200/SD18/ NUMA180 | 620 |
| MDC610/12.7RR-02 | 610 | 584.6 | 12.7 | 558 | 620 | 513 | QL200/SD18/ NUMA180 | 710 |
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