Concentric Overburden Drilling System with Ring Bits

Permanent
1. When drilling starts, the pilot bit drives the ring bit down to the hole, followed by the casing shoe and casing tube.
2. At the bedrock, start the reverse circulation of tools and pull the pilot bit from the drill hole. Leave the ring bit in the hole.
3. Pour the concrete or do the next construction task.


Retrievable
1. After the drilling starts, the pilot bit drives the ring bit down to the hole, followed by the casing shoe and casing tube.
2. At the bedrock, start the reverse circulation of tools and pull the pilot bit back from the drill hole. Leave the ring bit in the drill hole.
3. Pull the casing tube out with the ring bit and at the same time pour the concrete.


Permanent Retrievable
A E C D G
System No. Outer Dia. Thickness
Range
Ring bit
Outer Dia
Pilot bit Outer Dia Hammer Type Drill Pipe
Range
Ring Bit
Inner Dia.
KC85 108 mm
(4.25")
9-15mm
(0.35")-(0.59")
118mm
(4.65")
86 mm
(3.4")
DHD 3.5 76 mm
(3")
77 mm
(3.03")
KC90 114 mm
(4.5")
11-13 mm
(0.43)"-(0.51")
127 mm
(5")
9 0 mm
(3.6")
DHD 3.5
COP32/34
76 mm
(3")
82 mm
(3.22")
KC102 127 mm
(5")
11-13 mm
( 0 .43")-( 0 .51")
136 mm
(5.35")
102 mm
(3.97")
DHD3.5
COP32/34
76 mm
(3")
92 mm
(3.62")
KC115 140 mm
(5.5")
13 - 16 mm
(0.5")-(0.63")
152 mm
(5.98")
115 mm
(4.6")
DHD340
QL 40 , SD-4
76 mm
(3")
105 mm
(4.14")
KC115A 146mm
(5.75")
14-19mm
(0.55") - (0.75")
154 mm
(6")
115 mm
(4.6")
DHD340 ,
QL 40 , SD-4
76 mm
(3")
105 mm
(4.14")
KC140 168 mm
(6.6")
13-19 mm
(0.51") - (0.75")
184 mm
(7.25")
140 mm
(5.5")
DHD 350
QL 50 , SD-5
76mm
(3")
125 mm
(4.92")
KC152 178 mm
(7")
13- 19 mm
(0.51") - (0.75")
194 mm
(7.65")
150 mm
(5.9")
DHD350
QL50 , SD-5
76, 89 mm
(3"),(3.5")
140 mm
(5.5")
KC165 193 mm
(7.6")
13- 20 mm
(0.51") -(0.78")
206 mm
(8.11")
16 5 mm
(6.45")
DHD 360
QL 60 , SD-6
89, 114 m
(3.5"),(4.5")
150 mm
(5.90")
KC185 219 mm
(8.62")
13-20mm
( 0 .51") - ( 0 .78")
234 mm
(9.2")
184 mm
(7.25")
DHD 360
QL 60 , SD-6
89, 114 mm
(3.5"),(4.5")
165 mm
(6.5")
KC210 244 mm
(9.6")
13 - 20 mm
(0.51") -(0.78")
260 mm (10.25") 210 mm
(8.25")
DHD360/80
SD-6/8 , QL 60/80
114 mm
(4.5")
190 mm
(7.5")
KC240 273 mm
(10.75")
16- 22 Mm
(0.63") -(0.83")
305 mm
(12")
240 mm
(9.45")
DHD380,
QL 80 , SD-8
114, 127mm
(4.5"),(5")
220 mm (8.7")
KC280 323 mm
(12.7")
13- 22 mm
( 0 .51") -( 0 .86")
348 mm
(13.7")
284 mm
(11.2")
DHD 380 ,
QL 80 , SD 8/10
127 mm
(5")
255 mm
(10")
KC365 406 mm
(16")
18 -24 mm
(0.70") -(0.94")
440 mm (17.32") 364 mm
(14.33")
DHD112
QL 120 , SD - 10/12
140 mm
(5.5")
340 mm
(13.4")
KC410 457 mm
(18")
18 - 24 mm
(0.70") - (0.94")
488 mm
(19.2")
413 mm
(16.25")
DHD 112
QL 120 , SD-12
140 mm
(5.5")
385 mm
(15")
KC465 508 mm
(20")
18-24mm
( 0 .70")- ( 0 .94")
538 mm
(21.2")
464 mm
(18.25")
DHD 112
QL 120/200 , SD-15/18
140 mm
(5.5")
440 mm (17.3")
KC510 558 mm
(22")
18 - 24 mm
(0.70")-(0.94")
590 mm
(23.22")
514 mm
(20.25")
DHD 112S , QL 120/200
SD-15/18 , NUMA 180
140 mm
(5.5")
485 mm
(19")
KC560 610 mm
(24")
18 - 24 mm (0.70")-(0.94") 642mm
(25.25")
566 mm
(22.25")
QL 200
NUMA180 , SD-18
168 mm (6.6") 540mm
(21.25")
KC615 660 mm
(26")
18 - 24 mm
(0.70")-(0.94")
694 mm
(27.3")
615 mm
(24.2")
QL200/SD-18
NUMA180
168mm
(6.6")
590 mm
(23.2")
KC660 711 mm
(28")
18 - 24 mm
(0.70")-(0.94")
745 mm
(29.3")
665 mm
(26.2")
QL 200 , SD-18
NUMA 180/240
168mm
(6.6")
640 mm
(25.2")
KC715 762 mm
(30")
18 - 24 mm (0.70")-(0.94") 798 mm
(31.4")
716 mm
(28.2")
QL 200-SD18
N180/240
168mm
(6.6")
685 mm
(26.95")
KC815 863 mm
(34")
18 - 24 mm
(0.70")-(0.94")
900 mm
(35.4")
815 mm
(32")
QL 200
NUMA 180/240
168mm
(6.6")
785 mm
(30.9")
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