Professional DTH Hammer Tools Symmetric Overburden Casing Drilling System
The Prodrill symmetric drilling system is designed to drill and case a hole simultaneously through unstabled
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 minimising the
disruption of the surronding of the drill hole.
Application Range: It is suitable for drilling water wells , geothermal wells , short mircopiles ,medium mini-type grouting
hole of building , dam and harbour 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.
Advantages:
Full face head desigh for faster penetration and straighter hole
Less torque is required
Can drilll in vertical, horizotal or any direction
Minimize disruption to the drilled hole
Other Models
RoBit Size Permanent/Top hammer
Symmetrix overburden drilling system |
| Code No. |
Casing O.D. |
Wall thickness |
Ring bit I.D. |
Ring bit O.D. |
Polit bit O.D. |
Thread |
|
| mm |
inch |
mm |
inch |
mm |
inch |
mm |
inch |
mm |
inch |
| RoBit-SOD 89 |
89 |
3 1/2'' |
4 |
0.157 |
71 |
2.795 |
99 |
3.898 |
80 |
3.15 |
T38 |
| RoBit-SOD 76 |
76 |
3'' |
8 |
0.315 |
47 |
1.85 |
90 |
3.543 |
59 |
2.323 |
T38 |
| RoBit-SOD 89 |
89 |
3 1/2'' |
8 |
0.315 |
50.8 |
2 |
94.9 |
3.736 |
70 |
2.756 |
T38 |
| RoBit-SOD 101 |
101.6 |
4'' |
10 |
0.394 |
65 |
2.559 |
110 |
4.331 |
79 |
3.11 |
T38 |
| RoBit-SOD 114 |
114 |
4 1/2'' |
10 |
0.394 |
73.5 |
2.894 |
120.3 |
4.736 |
92.5 |
3.642 |
T38 |
| RoBit-SOD 140 |
140 |
5 1/2'' |
10 |
0.394 |
94 |
3.701 |
145.7 |
5.736 |
117.5 |
4.626 |
T45 |
| RoBit-SOD 168 |
168 |
6 5/8'' |
10 |
0.394 |
127 |
5 |
182.3 |
7.177 |
147 |
5.787 |
T45 |
SOD Permanent/Top hammer
Symmetrix overburden drilling system |
|
| Order number |
Casing wall
max. thickness |
Ring bit |
Pilot bit |
Unit |
|
| Inner |
Outer |
Outer |
| ATLAS-SOD 76 |
8 |
41 |
88 |
58 |
mm |
| 0.31 |
1.61 |
3.46 |
2.26 |
inch |
| ATLAS-SOD 89 |
8 |
54 |
100 |
70 |
mm |
| 0.31 |
2.13 |
3.94 |
2.76 |
inch |
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