厦门倍联矿山机械有限公司
Products
Quick Entry

Your present location:Home >> products >> product >> Casing systems >> Concentric Casing System >> Concentric casing system
  • Name: Concentric casing system
  • No: BL
  • Views : 62
  • Sold amount: 0Piece

Concentric casing system is designed to drill and case a hole simultaneously through unstable ground conditions. The driver bit incorporated with a satisficial ring or reusable ring makes a full face head design which significantly improves the penetration rate and hole straightness of drilling. The internal flushing grooves together with the built-in casing shoes gives a good seal to the button of the drilling hole, and thus minimizing the disruption of the surrounding of the drill hole. 

Application Range
: It is suitable for drilling water wells , geothermal wells , short miscopies ,medium mini-type grouting hole of building , dam and harbor project . 
1. Ring bit and casing shoe assembly is welded to casing prior to drilling. Lock the assembly into pilot bit with hammer. The pilot bit's upper shoulder engages the shoulder of the casing shoe. 
2. Hammer's percussive energy is transferred through the pilot and ring bits, crushing rock . Part of impact energy advances casing. 
3. On completion of drilling and casing , the drill string with pilot bit is retrieved by a slight reverse rotation to unlock the bayonet coupling . The ring bit stays in the hole , and can be recovered only if the casing is retrieved 
4. Drilling continues to the desired depth in the bedrock using a conventional drilling.

 

Outer Dia. of
Casing Tube
Inner Dia. of
Casing Tube
Reamed Dia.  Min. Inner Dia. of
Casing Shoe
 Drill Pipes Max. Outer Dia. of
Normal Bit
mm Mm mm mm mm mm
108 93-99 118 86 76 77
114 101-103 127 91 76 82
127 114-116 136 101 76 92
140 124-127 152 117 76 105
146 127-132 154 117 76 105
168 149-155 184 140 76,89 125
178 159-165 194 150 76,89 140
193 173-180 206 164 89,114 150
219 199-206 234 184 89,114 165
244 224-231 260 210 114 190
273 251-257 305 240 114,127 220
323 301-310 348 284 127 255
406 382-388 440 364 140 340
457 433-439 488 413 140 385
508 484-490 538 464 140 440