These anchors consist of a fully threaded hollow bar, that initially serves as a drill rod with couplers and a drilling bit (steel or carbide tipped) suited to different types of ground conditions. They are recommended in cases where a cased hole is necessary.
Self-drilling Anchors are successfully used for anchoring in poor ground, cohesive and non-cohesive soils, and in the case of unstable boreholes.
The main advantage of self-drilling anchors is their high efficiency, as several operations can be performed at once: drilling, installation of the anchor and sealing/grouting.
Main applications are:
- Tunneling and Mining
- Rock bolting
- Face anchoring
- Tunnel portals, trenches, and cut and cover area
- Reinforcement of excavation pits, dams, and slopes - grouted anchors
- Anchorage of retaining walls and noise barriers
Latest Pull Tests
| Achor Bar |
Outside | Internal | Effective Cross-Sectional Area (avg) | Ultimate Load Capacity | Yield Load Capacity | Design 70% | Design %60 | Weight Per FT/M |
| R-32N View Pull Test |
1-1/4" (32mm) | .61 in 2 (294mm 2) |
63 kips (280 kN) |
52 kips (229 kN) |
44.1 kips (196 kN) |
37.8 kips (168 kN) |
2.0 lbs/ft 3.0 kg/m |
|
| R-32S | 1-1/4" (32mm) | 0.9 in 2 (488 mm/2) |
81 kips (360 kN) |
63 kips (280 kN) |
56.7 kips (252 kN) |
48.6 kips (216 kN) |
2.3 lbs/ft 3.5 kg/m |
|
| R-38N | 1-1/2" (38 mm) |
1.11 in 2 (716 mm 2) |
112 kips (498 kN) |
90 kips (400 kN) |
78.4 kips (384 kN) |
67.2 kips (298 kN) |
3.2 lbs/ft 3.5 kb/m |
|
| R-51L | 2" (51 mm) |
1.20 in 2 (774 mm 2) |
124 kips (550 kN) |
101 kips (450 kN) |
86.8 kips (394 kN) |
74.4 kips (330 kN) |
4.3 lbs/ft 6.5 kg/m |
|
| R-51L | 2" (51 mm) |
1.45 in 2 (939 mm 2) |
180 kips (801 kN) |
142 kips (630 kN) |
126 kips (560 kN) |
108 kips (480 kN) |
5.0 lbs/ft 7.5 kg/m |
|
| 52 / 26 | 2.05" (52 mm) |
1.02" (26 mm) |
2.07 in 2 (1337 mm 2) |
209 kips (929 kN) |
164 kips (730 kN) |
146.3 kips (650 kN) |
125.4 kips (557 kN) |
6.7 lbs/ft 10 kg/m |
| 30 / 11 | 1.18" (30 mm) |
0.43" (11 mm) |
.69 in 2 (446 mm 2) |
72 kips (320 kN) |
58.5 kips (260 kN) |
50.4 kips (224 kN) |
43.2 kips (192 kN) |
2.1 lbs/ft 3.1 kg/m |
| 30 / 14 | 1.18" (30 mm) |
0.55" (14 mm) |
.61 in 2 (395 mm 2) |
58.5 kips (260 kN) |
49.5 kips (220 kN) |
40.1 kips (182 kN) |
35.1 kips (156 kN) |
1.9 lbs/ft 2.9 kg/m |
| 30 / 16 | 1.18" (30 mm) |
0.63" (16 mm) |
.59 in 2 (382 mm 2) |
49 kips (220 mm 2) |
40.5 kips (180 mm 2) |
34.3 kips (154 kN) |
29.4 kips (132 kN) |
1.8 lbs/ft 2.7 kg/m |
| 40 / 16 | 1.57" (40 mm) |
0.63" (16 mm) |
1.36 in 2 (879 mm 2) |
142 kips (635 kN) |
112.5 kips (500 kN) |
103.9 kips (462 kN) |
89 kips (396 kN) |
4.7 lbs/ft 7.0 kg/m |
| 40 / 20 | 1.57" (40 mm) |
0.79" (20 mm) |
1.13 in 2 (726 mm 2) |
121 kips (539 kN) |
96.7 kips (430 kN) |
84.7 kips (377 kN) |
62.7 kips (323 kN) |
3.7 lbs/ft 5.6 kg/m |
| T-76N | 3" (76 mm) |
2.09" (53 mm) |
2.84 in 2 (53 mm) |
360 kips (1600 kN) |
270 kips (1200 kN) |
252 kips (1121 kN) |
216 kips (960.8 kN) |
10.7 lbs/ft 26 kg/m |
