| Customized: | Customized |
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| Standard: | API |
| Length: | Taper-length |
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The Symmetric/Concentric drilling 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.
Our mini excavator owns beautiful appearance, high configuration, superior performance,
low fuel consumption, wide operating range. It is suitable for loosing soil of vegetable green house, campus greening of municipal departments, digging the hole for tree planting of Fruit-land Nurseries, concrete pavement crushing, sand-gravel material mixing, construction work on the narrow place and so on. Use the quick hitch can add the attachment tools like auger, hydraulic hammer, loading bucket, gripper and so on. It can reduce maintenance and operating costs. Liberate the workforce, improve the mechanization, low investment, high return.
| model | casing tube O.D./mm | bit diameter/mm | casing shoe I.D./mm | maximum reaming O.D. /mm | hammer style |
| 146 | 146 | 123.5 | 116 | 156 | 4" |
| 168 | 168 | 146 | 140 | 184 | 5" |
| 178 | 178 | 157 | 150 | 194 | 5" |
| 183 | 183 | 160 | 152 | 198 | 5" |
| 194 | 194 | 178 | 164 | 208 | 6" |
| 219 | 219 | 203 | 192 | 234 | 6-7" |
| 245 | 245 | 217 | 205 | 260 | 6-8" |
| 273 | 273 | 246 | 233 | 291 | 8" |
| 325 | 325 | 297 | 282 | 340 | 8-10" |
| 377 | 377 | 351 | 332 | 405 | 10-12" |
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