Concentric Overburden Drilling System with Blocks


Operation Procedure
1. As drilling begins, the blocks slide down through the grooves on the pilot bit, and the ream drives the casing shoes and tubes into the drill hole.
2. After the drilling process is complete in overburden rock formations, raise the drilling tools, allowing the blocks to close through the grooves. Once this is done, the drilling tools can be pulled out from the drill hole.
3. Next construction tasks can be carried out.

A E C D DTH Hammer
System No. OuterDia. Thickness
Range
Pilot bit with Block
Outer Dia.
Pilot Bit
Outer Dia.
Hammer Type Drill Pipes
KB140 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
76, 89 mm
(3"), (3.5")
KB150 178 mm
(7")
13-19 mm
( 0 .51") - ( 0 .75")
194 mm
(7.64")
150 mm
(5.90")
DHD 350/360
QL50/60 , SD5/6
76, 89 mm
(3"), (3.5")
KB165 193 mm
(7.6")
13-20 mm
( 0 .51") - ( 0 .78")
206 mm
(8.11")
164 mm
(6.45")
DHD 360
QL 60 , SD-6
89, 114 mm
(3.5"),(4.5")
KB180 219 mm
(8.62")
13-20 mm
( 0 .51") - ( 0 .78")
234 mm
(9.2")
182 mm
(7.16")
DHD 360
QL 60 , SD-6
89, 114 mm
(3.5"),(4.5")
KB210 244 mm
(9.6")
13-20 mm
( 0 .51") - ( 0 .78")
260 mm
(10.25")
210 mm
(8.25")
DHD360/380
QL-60/80 , SD-6/8
114 mm
(4.5")
KB240 273 mm
(10.75")
16-20 mm
( 0 .63") - ( 0 .78")
305 mm
(12")
240 mm
(9.45")
DHD 380
QL 80 / SD-8
114,127mm
(4.5"), (5")
KB280 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")
KB365 406 mm
(16")
18-24 mm
( 0 .70") - ( 0 .94")
440 mm
(17.32")
364 mm
(14.33")
DHD 112
QL 120 , SD-10/ 12
127,140mm
(5"), (5.5")
KB410 457 mm
(18")
18-24 mm
( 0 .70") - ( 0 .94")
488 mm
(19.2")
413 mm
(16.25")
DHD 112
QL-120/200 , SD-15
127,140mm
(5"),(5.5")
KB460 508 mm
(20")
18-24 mm
( 0 .70") - ( 0 .94")
538 mm
(21.2")
464 mm
(18.26")
DHD 112S
QL 120/200 , SD-15/18
140 mm
(5.5")
KB510 558 mm
(22")
18-24 mm
( 0 .70") - ( 0 .94")
590 mm
(23.2")
514 mm
(20.2")
DHD 112S
QL 120/200 , SD-15/18 , N180
140 mm
(5.5")
KB560 610 mm
(24")
18 - 24 mm
( 0 .70") - ( 0 .94")
642 mm
(25.25")
566 mm
(22.3")
QL 200 ,
SD-18 , NUMA 180
140, 168mm
(5.5"),(6.6")
KB615 660 mm
(26")
18 - 24 mm
( 0 .70") - ( 0 .94")
694 mm
(27.3")
615 mm
(24.2")
QL 200 , SD-18
NUMA 180/240
168mm
(6.6")
KB665 711 mm
(28")
18 - 24 mm
( 0 .70") - ( 0 .94")
745 mm
(29.3")
665 mm
(26.2")
QL 200 , SD-18
NUMA180/240
168 mm
(6.6")
KB715 762 mm
(30")
18 - 24 mm
( 0 .70") - ( 0 .94")
798 mm
(31.4")
716 mm
(28.2")
QL 200 , SD-18
NUMA 180/240
168mm
(6.6")
KB815 863 mm
(34")
18 - 24 mm
( 0 .70") - ( 0 .94")
900 mm
(35.4")
815 mm
(32")
QL 200 , SD-18
NUMA 240
168 mm
(6.6")
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