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D Mininwell concentric drilling method with odex bit

In some loose and unstable rock formations, problems such as hole collapse and burial often occur during drilling. How to avoid this series of problems? After several years of on-site practice and research, Tianhe Drilling Tools has found that concentric drilling tools have the widest applicability to formations. In addition to dealing with eccentricity and the formation conditions targeted by sliders, they can also deal with large blocks. For dry rocks, karst caves, etc., the depth of the pipe can reach about 100 meters, and the drilling efficiency of the pipe is fast, and it can also be used in the field of foundation piles.

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1.Structure of concentric casing system


Casing shoe: Used to connect the casing tube.
Ring bit: Used to connect the pilot bit and casing shoe.
Pilot bit: The major structure of concentric casing system,with buttons and flushing grooves, etc.

2. Operation procedure


(1).Concentric system drilling through overburden
(2).Reverse rotation of the hammer and pull out the pilot bit.
(3).Replace the pilot bit to normal bit to continue drilling

3. Scope of application:
Applicable to overburden with complex dry geological conditions, such as pebbles, cracks, dry rocks, boulders, construction backfill waste, etc. Drilling holes at any angle with high straightness
The maximum hole depth can reach 150 meters

4. Structural advantages:
Straightness: Under different geological structures, the straightness of hole formation can be guaranteed
Adaptability: In complex geological structures, such as pebbles and construction waste, the drilling efficiency can be guaranteed.
Less Torque: Less torque compared to eccentric drilling system.
Easy to Unlock and Relock: Easy to relock after unlocking.
Drilling at any angle: the concentric tubular drilling tool can drill in vertical, horizontal and inclined states.
Environmental protection: Compared with eccentric drilling tools, it is more suitable for construction in urban areas because of its stable drilling, low vibration and low noise.

Technical Parameters of Concentric drilling tools
Size OD of casing pipe(mm) ID of casing pipe(mm) Wall thickness Center drill Perforated Allow pass Matching DTH Hammer Weight (KG)
(mm) bit most size drill bit diameter
Large outer diameter (mm) (mm)
(mm)
P114/9-84 114 94 10 94 126 84 COP34/DHD3.5/MW3.5 10
P127/10-93 127 107 10 105 142 93 COP34/DHD3.5/MW3.5 16
P140/10-97 140 120 10 116 161 97 COP44/DHD340(MW4)/SD4/QL40 21
P146/10-110 146 126 10 124 165 110 COP44/DHD340/(MW4)/SD4/QL40 22
P168/12.7-127 168 142.6 12.7 141 188 127 COP54/DHD350(MW5)/SD5/QL50/M50 27
P178/12.7-131 178 152.6 12.7 150 196 131 COP54/DHD350(MW5)/SD5/QL50/M50 32.5
P194/12.7-145 194 168.6 12.7 166 214 145 COP64/DHD360(MW6)/SD6/QL60/M60 42.5
P219/12.7-170 219 193.6 12.7 191 243 170 COP64/DHD360{MW6)/SD6/QL60/M60 58
P245/12.7-195 245 219.6 12.7 214 268 195 COP84/DHD380/(MW8)/SD8/QL80 78
P254/12.7-203 254 228.6 12.7 224 276 203 COP⁸4/DHD380(MW8)/SD8/QL80 84.5
P273/12.7-223 273 247.6 12.7 241 298(305) 223 COP84/DHD380(MW8)/SD8/QL80 100
P325/12.7-276 325 299.6 12.7 292 350 276 COP84/DHD380(MW8)/SD8/QL8O 135
P406/12.7-350 406 380.6 12.7 377 442 350 DHD112(MW12)/QL120/SD12/NUMA120 280
P508/12.7-416 508 482.6 12.7 478 545 416 QL200/SD18/NUMA180/MW18 522
P560/12.7-475 560 534.6 12.7 528 595 475 QL200/SD18/NUMA180/MW18 620
P610/12.7-513 610 584.6 12.7 558 645 513 QL200/SD18/NUMA180/MW18 710
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