R thread self-drilling anchor bolt system is composed of a hollow rock bolt, anchor nut, anchor plate, anchor coupler, drill bit, centralizer, and the hollow anchor bars can be cut and lengthened by coupling on request.
Functions:
R thread self-drilling anchor bolt system is an advanced system that can ensure the anchoring effect for complex ground conditions. It can be integrated with the functions of drilling, grouting, and anchoring.
Conditions:
• Tunneling
• Mining
• Slope Stabilization
• Foundation Support
Features and advantages:
1. Safe, reliable, and time-saving.
2. Simple installation & operation.
3. Choice of drill bits for different ground conditions.
4. Grouting works synchronize with drilling or after drilling. Grout can fill fractures effectively.
5. Anchor bars can be cut and lengthened on request, applying to narrow spaces.
6. It provides higher bonding stress than smooth steel pipe depending on continuous wave thread.
Technical Data:
Hollow Bar
| Size | Outer Dia. (mm) | Ultimate Load (kN) | Yield Load (kN) | Weight (Kg/m) |
| SER25N | 25 | 200 | 150 | 2.35 |
Coupler
| Size | Outer Dia. (mm) | Length (mm) | Weight (Kg/pc) | Note |
| SSR25 | 36 | 150 | 0.66 | With sealing structure |
| SER25 | 36 | 150 | 0.68 | Without sealing structure |
Hex Nut
| Size | Key Size (mm) | Length (mm) | Weight (Kg/pc) | Note |
| SSR25 | 41 | 30 | 0.20 | Heat treatment |
| SER25 | 41 | 35 | 0.23 | Without heat treatment |
Domed Nut
| Size | Key Size (mm) | Length (mm) | Weight (Kg/pc) | Note |
| SER25 | 41 | 40.5 | 0.31 | Without heat treatment |
Domed Plate
| Size | Dimensions (mm) | Thickness (mm) | Hole Dia. (mm) | Weight (Kg/pc) |
| SER25 | 150×150 | 8 | 30 | 1.40 |
| 150×150 | 5 | 28 | 0.85 | |
| 200×200 | 10 | 32 | 3.20 |
Drill Bit
| Size | Outer Dia. (mm) | Application Range (Advice) | |||
| EX | Sand, fills, gravel | ||||
| SSR25/42 | 42 | ||||
| SSR25/51 | 51 | ||||
| EXX | Softer sedimentary rocks such as marls, mudstones, siltstone | ||||
| SSR25/42 | 42 | ||||
| SSR25/51 | 51 | ||||
| ES-F | Gravel, soft rock | ||||
| SSR25/42 | 42 | ||||
| SSR25/51 | 57.5 | ||||
| ESS-F | Weathered rock, stone walls, rubble | ||||
| SSR25/42 | 42 | ||||
| SSR25/51 | 51 | ||||
| EY | Competent ground, strong rock | ||||
| SSR25/51 | 51 | ||||
