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Symmetrix Overburden Casing System

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 The Symmetrix (Concentric casing system)

Application: It is recommended to drill in rock formation where contains some ovals and fractures

Feature: The stable and reliable working performance and the less vibration of drill rig

Structure: Concentric system with ring bit, with wings and with blocks

 SYMMETRIX WITH RING BIT
Recyclable

1.When the drilling starts, the pilot bit drive the ring bit down to the hole, followed the casing shoe and casing.
2.When arriving the bedrock, reverse rotation of the tools and pull the pilot bit out from the hole, leaving the ring bit in the hole.
3.Pour the concrete or do the next construction work.

Unrecyclable

1.When the drilling starts, the pilot bit drive the ring bit down to the hole, followed the casing shoe and casing.
2.When arriving the bedrock, reverse rotation of the hammer and pull the pilot bit out from the hole, leaving the ring bit in the hole.
3.Pull the casing tube out with the ring bit and at the same time pour the concrete.

OD. of casing tube mm ID. of casing tube mm Reamed Dia. mm Min. ID. of casing shoe mm Hammer Drill rod OD. mm Max. OD. of normal bit mm
108 93-99 118 86 DHD3.5 76 77
114 101-103 127 91 DHD3.5 76 82
127 114-116 136 101 DHD3.5 76 92
140 124-127 152 117 DHD340 76 105
146 127-132 154 117 DHD340 76 105
168 149-155 184 140 DHD350 76,89 125
178 159-165 194 150 DHD350 76,89 140
193 173-180 206 164 DHD360 89,114 150
219 199-206 234 184 DHD360/DHD380 89,114 165
244 224-231 260 210 DHD380/KD220 114 190
273 251-257 305 240 DHD380/KD220 114,127 220
323 301-310 348 284 DHD380/KD220 127 255
406 382-388 440 364 KD220/DHD112 140 340
457 433-439 488 413 DHD112 140 385
508 484-490 538 464 DHD112 140 440
558 534-540 590 514 DHD112/KD398 140 485
610 586-592 642 566 DHD112/KD398 168 540
660 636-642 694 615 KD398 168 590
711 687-693 745 665 KD398 168 640
762 738-744 798 716 KD600 168 685
863 839-845 900 815 KD600 168 785

Symmetrix with wing

Operation Procedure

1.when the drilling starts, the wings swing out, and reams to drive the casing shoes and tubes into the hole.
2. When finished the drilling in overburden rock formations, reverse the drilling tools and the wings will get closed, and the drilling tools can be raised from the hole.
3. Next construction can be followed.

OD. of casing tube mm ID. of casing tube mm Reamed Dia. mm Min. ID. of casing shoe mm Hammer Drill rod OD. mm
114 101-103 125 93 DHD3.5 64
140 124-127 152 113 DHD340 76
146 127-132 154 115 DHD340 76
168 149-155 184 138 DHD350 76,89
178 159-165 194 148 DHD350 76,89
193 173-180 206 164 DHD360 114
219 199-206 234 185 DHD360/DHD380 114
244 224-231 273 219 DHD380 114

Symmetrix with block

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.  

OD. of casing tube mm ID. of casing tube mm Reamed Dia. mm Min. ID. of casing shoe mm Hammer Drill rod OD. mm
168 149-155 184 140 DHD350 76,89
178 159-165 194 150 DHD350 76,89
193 173-180 206 164 DHD360 89,114
219 199-206 234 182 DHD360/DHD380 89,114
244 224-231 260 210 DHD380/KD220 114
273 251-257 305 240 DHD380 114,127
323 301-310 348 284 DHD380/KD220 127
406 382-388 440 364 KD220/DHD112 127,140
457 433-439 488 413 DHD112 127,140
508 484-490 538 464 DHD112 140
558 534-540 590 514 DHD112/KD398 140
610 586-592 642 566 DHD112/KD398 140,168
660 636-642 694 615 KD398 168
711 687-693 745 665 KD398 168
762 738-744 798 716 KD600 168
863 839-845 900 815 KD600 168

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