Atlas Copco’s Symmetrix Overburden Casing System
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Overview:
Symmetrix is a patented system comprised of an ingeniously simple concentric method of drilling through overburden with casing. Not only is it an all-around multipurpose concentric drilling system, it has opened the way for engineering consultants to utilize new construction methods that save contractors time and money.
Symmetrix can:
- Drill straight holes at any angle (including horizontal), in any type of ground condition, and to depths beyond 100 meters
- Drill holes from 3 inches (76 mm) up to 48 inches (1,220 mm) in diameter
- Be used with DTH rigs or Top-Hammer rigsg
Components:
- A pilot bit, with large internal flushing holes and external flushing grooves
- Symmetrical Ring Bit (reamer) with internal bayonet coupling
- Casing shoe for driving of the casing
The Pilot Bit is attached to any common DTH hammer shank or top hammer rod thread.
Method:
The casing shoe is welded to the casing. The pilot bit and ring bit are locked together by the bayonet coupling. Together they drill a hole large enough to allow the casing to be pulled into the hole. The pilot bit and ring bit rotate with the drill string while the casing shoe and casing do not rotate. After completing the hole, the pilot bit is unlocked by a slight reverse rotation of the drill string. The drill string and pilot bit are then retrieved through the casing.
Pros/Cons:
- Straight holes always without deviation due to changing ground formations
- Less torque required
- Simple fool-proof design
- Easy unlock - Easy relock
- Drilling at any angle
- Effective internal flushing
- Safe
- Economical
Applications:
Micro-piling, Underpinning, Anchoring, Marine piling, Horizontal drilling, Slope stabilization, Curtain Grouting, Tunnel-Fore poling
Click throught the tabs below to see different systems.
Types of Symmetrix Systems available:
System Casking OD Casing Ring Bit ID Ring Bit OD Pilot Bit OD DTH 71 4.00 0.22 2.84 4.25 3.51 72 3.50 0.13 2.84 3.94 3.17 82 4.50 0.24 3.25 4.92 3.98 3" 90 4.50 0.20 3.57 5.04 4.03 3" 98 5.50 0.39 3.89 5.79 4.57 4" 105 5.75 0.31 4.17 5.98 5.04 4" 115 5.50 0.20 4.57 5.94 5.04 4" 126 6.63 0.39 4.98 7.01 5.76 5" 135 6.63 0.22 5.33 7.24 6.08 5" 140 6.63 0.22 5.54 7.24 6.12 5" 142 7.00 0.31 5.57 7.52 6.30 5" - 6" 151 7.63 0.43 5.93 8.07 6.65 6" 155 7.63 0.35 6.14 8.07 6.84 6" 165 7.63 0.24 6.57 8.27 7.09 6" 170 8.63 0.50 6.69 9.13 7.52 6" 185 8.63 0.24 7.32 9.21 8.07 6" 190 8.63 0.20 7.56 9.29 8.11 6" 212 10.00 0.31 8.39 10.55 9.29 8" 218 10.75 0.50 8.61 11.22 9.69 8" 231 10.75 0.31 9.13 11.30 10.04 8" 274 12.75 0.50 10.83 13.35 11.67 8" - 12" 281 12.75 0.31 11.06 13.43 12.03 8" - 12" 300 14.00 0.50 11.73 14.53 12.87 10" - 12" 354 16.00 0.50 13.93 16.54 14.88 10" - 12" 396 18.00 0.50 15.59 18.58 16.93 12" - 16" 445 20.00 0.50 17.52 20.55 18.86 12" - 18" 545 24.00 0.50 21.47 24.49 22.83 16" - 20" 640 28.00 0.59 25.20 28.54 26.65 16" - 20" 738 32.00 0.59 29.06 32.60 30.63 18" - 24" 838 36.00 0.59 32.95 36.61 34.57 20" - 30" (Used primarily for permanent casing applications in foundation and well drilling industry) System Casing OD Casing Ring Bit ID Ring Bit OD Pilot Bit OD DTH SE113 4.50 0.39 2.41 4.92 3.65 3" SE139 5.50 0.39 3.23 5.91 4.61 4" SE152 6.00 0.39 3.70 6.42 5.08 4" SE168 6.63 0.39 4.25 7.05 5.71 5" SE178 7.00 0.39 4.57 7.40 6.06 5" SE194 7.63 0.50 5.00 8.11 6.50 6" SE219 8.63 0.50 5.75 9.13 7.48 6" SE273 10.75 0.50 7.60 11.46 9.49 8" SE324 12.75 0.50 9.65 13.43 11.50 8" - 12" SE406 16.00 0.50 13.07 16.57 14.84 10" - 12" SE508 20.00 0.57 17.01 20.51 18.70 12" - 18" SE610 24.00 0.57 20.75 24.45 22.68 16" - 20" SE711 28.00 0.63 25.83 28.54 26.54 16" - 20" SE812 32.00 0.63 29.80 32.60 30.55 18" - 24" SE914 36.00 0.63 33.74 36.61 34.53 20" - 30" System Casing OD Casing Ring Bit ID Ring Bit OD Pilot Bit OD DTH N58 3.50 0.39 2.28 3.78 2.68 N69 4.00 0.39 2.74 4.33 3.11 N82 4.50 0.39 3.24 4.80 3.62 3" N95 5.00 0.39 3.74 5.35 4.13 3" N98 5.25 0.39 3.85 5.55 4.33 4" N104 5.50 0.39 4.10 5.79 4.55 4" N116 6.00 0.39 4.55 6.30 5.08 4" - 5" N131 6.63 0.39 5.18 7.01 5.63 5" N141 7.00 0.39 5.55 7.40 6.02 5" N154 7.63 0.47 6.05 8.03 6.57 6" N175 8.63 0.50 6.89 9.02 7.48 6" N200 9.63 0.50 7.89 10.08 8.50 6" - 8" N207 10.00 0.50 8.16 10.51 8.82 6" - 8" N220 10.51 0.50 8.67 11.02 9.29 8" N226 10.75 0.50 8.91 11.26 9.57 8" N273 12.75 0.50 10.75 13.31 11.55 8" - 12" N306 14.00 0.50 12.00 14.57 12.80 10" - 12" N352 16.00 0.59 13.85 16.65 14.69 10" - 12" N364 16.50 0.59 14.32 17.09 15.16 10" - 12" N398 18.00 0.59 15.67 18.70 16.65 12" - 16" N444 20.00 0.59 17.48 20.71 18.66 12" - 18" N492 22.00 0.59 19.41 22.76 20.63 12" - 20" N555 24.00 0.59 21.89 25.08 22.76 16" - 20" N592 26.00 0.59 23.31 26.81 24.65 16" - 20" N642 28.00 0.59 25.28 28.86 26.65 16" - 20" N692 30.00 0.59 27.24 30.87 28.62 18" - 24" N740 32.00 0.59 29.13 32.80 30.59 18" - 24" N790 33.98 0.59 31.10 34.80 32.60 18" - 24" N838 36.00 0.59 32.99 36.81 34.57 20" - 30" (Used primarily for temporary casing applications in foundation and well drilling industry) System Casing OD Casing Ring Bit ID Ring Bit OD Pilot Bit OD DTH N64DT 4.00 0.31 2.52 4.41 2.91 N80DT 4.50 0.31 3.15 5.12 3.58 3" N94DT 5.25 0.39 3.70 5.91 4.13 3" - 4" N97DT 5.50 0.47 3.82 5.94 4.24 4" N105DT 6.00 0.50 4.12 6.38 4.61 4" N120DT 6.63 0.50 4.75 7.24 5.24 5" N127DT 7.00 0.50 5.00 7.56 5.51 5" - 6" N142DT 7.63 0.57 5.59 8.23 6.18 6" N166DT 8.63 0.57 6.54 9.21 7.09 6" N207DT 10.75 0.79 8.15 11.46 8.90 8" N256DT 12.75 0.79 10.08 13.58 10.83 8" - 12" N330DT 16.00 0.79 12.99 16.54 13.70 10" - 12" N434DT 20.00 0.79 17.09 20.91 17.99 12" - 18" N486DT 22.00 1.00 19.13 23.11 19.96 16" - 20" N532DT 24.00 1.00 20.94 24.92 21.69 16" - 20" N630DT 28.00 1.00 24.80 28.86 25.51 16" - 20" System Casing OD Casing Ring Bit ID Ring Bit OD Pilot Bit OD DTH W70DT 4.00 0.31 2.78 4.65 3.29 3" W80DT 4.50 0.39 3.16 5.08 3.65 3" W96DT 5.25 0.39 3.78 5.94 4.37 3" - 4" W100DT 5.50 0.39 4.02 6.18 4.61 4" W110DT 6.00 0.50 4.32 6.54 4.92 4" W124DT 6.63 0.50 4.88 7.24 5.51 5" W133DT 7.00 0.50 5.24 7.60 5.87 5" - 6" W146DT 7.63 0.50 5.75 8.31 6.48 6" W172DT 8.63 0.50 6.77 9.33 7.50 6" W222DT 10.75 0.50 8.74 11.61 9.54 8" W272DT 12.75 0.50 10.71 13.78 11.57 8" - 12" W354DT 16.00 0.50 13.94 17.36 14.84 10" - 12" W404DT 18.00 0.50 15.91 19.33 16.81 12" - 16" W444DT 20.00 0.63 17.48 21.22 18.62 12" - 18" W490DT 22.00 0.63 19.29 23.27 20.51 16" - 20" W540DT 24.00 0.63 21.26 25.24 22.48 16" - 20" W640DT 28.00 0.63 25.20 29.29 26.46 16" - 20" System Casing OD Casing Ring Bit ID Ring Bit OD Pilot Bit OD DTH HZ219 8.63 0.39 5.24 9.49 7.72 6" HZ273 10.75 0.47 7.28 11.61 9.65 8" HZ324 12.75 0.47 9.45 13.62 11.65 8" - 12" HZ406 16.00 0.50 12.32 17.32 14.92 10" - 12" HZ508 20.00 0.50 16.30 21.26 18.90 12" - 18" HZ609 24.00 0.50 20.28 25.20 22.87 16" - 20" HZ711 28.00 0.59 24.21 29.21 26.61 20" - 30" HZ812 32.00 0.59 28.15 33.15 30.55 20" - 30" HZ914 36.00 0.59 32.09 37.09 34.49 20" - 30" (Used primarily for utility lines, pipe roofs, and all break-through drilling.) System Casing OD Casing Ring Bit ID Ring Bit OD Pilot Bit OD Thread T40 3.00 0.30 1.57 3.15 2.36 32 T50 3.50 0.31 1.97 3.74 2.79 32 - 38 T54 3.50 0.31 2.13 3.94 2.76 32 - 38 T60 4.00 0.31 2.36 4.29 3.29 32 - 38 T66 4.50 0.39 2.60 4.80 3.65 38 - 45 T69 4.50 0.31 2.80 4.80 3.79 38 - 45 T90 5.25 0.31 3.54 5.55 4.54 45 - 58 T90A 5.50 0.39 3.54 5.79 4.54 45 - 58 T95 5.50 0.31 3.74 5.79 4.79 45 - 58 T105 6.00 0.39 4.13 6.30 5.18 51 - 68 T120 6.63 0.39 4.72 6.93 5.77 51 - 58STD/ECON
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N-Drill Through System
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HZ System
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T - Tunneling System
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