Active Member
|
[China]
Address: No. 018, Yaojiapo Road., Jinzhou New District, Ningxiang County
Contact name:Spring Huang
Changsha Tianhe Drilling Tools and Machinery Co.,Ltd. |
|
|
O.D. 194mm Concentric overburden drill bit with blocks
| Specification |
1.Face: Flat,Convex,Concave,Drop-center.
2.Carbide Button Shape: Spherical,Semi-ballistic,Ballistic and Two-step
3.Bit Shank: COP64/DHD360(TH6)/SD6/QL60/M60
| Retrievable model | Outer Dia.of casing tube | Inner Dia.of casing tube | Wall thickness of casing | Ring bit outer Dia(mm) | Ring Bit set inner Dia.(mm) | Max.outer Dia.of normal bit(mm) | Hammer Type | |
| (mm) | (mm) | (mm) | ||||||
| TOP HAMMER | ||||||||
| R76/8-41-R32 | 76 | 60 | 8 | 88 | 41 | 58 | R32 | |
| R89/8-54-T38 | 89 | 73 | 8 | 100 | 54 | 70 | T38 | |
| R114/10-61-T45 | 114 | 94 | 10 | 125 | 61 | 93 | T38 | |
| R140/10-75-T38 | 140 | 120 | 10 | 158 | 75 | 117 | T45/T51 | |
| DTH | ||||||||
| R114/10-80 | 114 | 101 | 6.5 | 122 | 80 | 78 | COP44/DHD340/Mach44/M40/SD4/XL4/QL40 | |
| R139/10-102 | 139 | 119 | 10 | 147 | 102 | 100 | ||
| R152/10-114 | 152 | 132 | 10 | 160 | 114 | 112 | ||
| R168/10-130 | 168 | 148 | 10 | 177 | 130 | 128 | COP54/DHD350/Mach50/M50/SD5/QL50 | |
| R193/12.7-152 | 193 | 167.6 | 12.7 | 203 | 152 | 150 | COP64/COP62/DHD360/M60/SD6/XL6/QL60/TD150 | |
| R219/12.7-175 | 219 | 193.6 | 12.7 | 232 | 175 | 173 | ||
| R244/12.7-198 | 244 | 218.6 | 12.7 | 254 | 198 | 196 | DHD380/COP84/SD8/QL80/TK18 | |
| R273/12.7-224 | 273 | 247.6 | 12.7 | 285 | 224 | 222 | ||
| R323/12.7-271 | 323 | 297.6 | 12.7 | 338 | 271 | 269 | ||
| R406/12.7-350 | 406 | 380.6 | 12.7 | 420 | 350 | 348 | ||
| R508/16-444 | 508 | 476 | 16 | 524 | 444 | 442 | ||
| R609/16-553 | 609 | 577 | 16 | 637 | 553 | 551 | QL200/SD18/ | |
| NUMA180/TH18/ | ||||||||
| TS18/TK18 | ||||||||
| R711/16-639 | 711 | 679 | 16 | 731 | 639 | 637 | QL200S/TH32/ | |
| R762/16-690 | 762 | 730 | 16 | 781 | 690 | 688 | TK24 | |
| R812/16-734 | 810 | 780 | 16 | 834 | 734 | 732 | ||
| R914/16-835 | 914 | 882 | 16 | 935 | 835 | 833 | ||
| R1016/16-911 | 1016 | 984 | 16 | 1033 | 911 | 909 | QL300 | |
| General Introduction |
Application Range
It is recommended to drill in rock formation where contains some ovals and fractures.
Design Principles
Make the casing follow easy and the equipment and operation simple
Outstanding Advantages
1.The stable and reliable working performance and the less vibration of drill rig.
2.Flexible to open and close.
Operation Procedure
1.when the drilling starts, the blocks slides down through the grooves on pilot bit,and reams to drive the casing shoes and tubes into the hole.
2.When finished the drilling in overburden rock formations, raise the drilling tools and the blocks will get closed through the grooves , and the drilling tools can be pulled out from the hole.
3. Next construction can be followed.
| Raw Material |
Steel:
first class special alloy steel with high strength, heat resistance and wearable
Carbide
The best tungsten carbides from China are commonly applied.
Tungsten carbide from European is also available.
Structural Advantage |
Straightness: ensure the staightness of borehole in different topographic and geological conditions.
Adaptability: ensures penetration efficiency in complex topograhic and geological conditions, such as gravel and landfill of construction refuse.
Lower torque: the system torque 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 under horizontal, vertical and inclined condtions.
Enviromental: better than eccentric casing system because of its advantages of drilling smoothily, small vibration and low noise, it's more suitable for construction in urban areas.
