TC Button bit
TC Button Bit for Self-drilling Anchor Systems
The TC (Tungsten Carbide) Button Bit is a critical high-performance component engineered exclusively for self-drilling anchor systems, designed to address the rigorous demands of geotechnical anchoring projects in complex strata. By integrating premium tungsten carbide inserts with a robust structural design, it delivers seamless synergy of drilling, anchoring, and synchronous grouting—becoming an indispensable tool for stable and efficient construction in hard, abrasive, or fractured formations.
Core Structure & Material Advantages
- Tungsten Carbide Button Inserts: Spherical/hemispherical TC buttons (HRC ≥ 90) are precision-brazed to the drill face, arranged in optimized triangular/hexagonal patterns. This configuration ensures concentrated impact force, exceptional wear resistance, and prolonged service life even in rock with compressive strength up to 200 MPa (e.g., granite, basalt).
- High-Strength Steel Body: Manufactured from quenched-tempered alloy steel (e.g., 42CrMo, 35CrNiMo, HRC 32–38), the body offers superior torque resistance, impact toughness, and compatibility with self-drilling anchor rod threads (e.g., R32, R38, T38, custom API threads).
- Integrated Grouting Channels: Internal hollow channels (diameter 8–20mm) with side outlets ensure unobstructed grout flow during drilling. Prevents debris blockage and enables uniform grout penetration, reinforcing the bond between the anchor rod and surrounding rock/soil.
Key Functions & Working Principle
Tailored for self-drilling anchor systems, the bit operates through a streamlined, integrated process:
- Secure Connection: Threaded to the front end of the self-drilling anchor rod, forming a rigid assembly with the drill rig.
- Efficient Drilling: Driven by rotational torque and axial thrust, the TC buttons crush hard rock via impact force, while the bit’s flutes discharge debris—ensuring fast penetration and straight boreholes.
- Synchronous Grouting: Cement-based or polymer-modified grout is pumped through the anchor rod’s hollow core, flows through the bit’s channels, and is ejected to fill the borehole gap in real time.
- Stable Anchoring: After reaching the designed depth, grouting continues until overflow. Once cured, the anchor rod, grout, and surrounding strata form a high-strength composite system, providing reliable tensile and shear resistance.
Application Scenarios
Ideal for geotechnical projects requiring anchoring in harsh strata:
- Slope stabilization and landslide prevention in fractured hard rock areas
- Foundation pit support for high-rise buildings, bridges, and industrial facilities
- Tunnel lining reinforcement and underground engineering (e.g., subway, highway tunnels)
- Deep anchoring (depth ≥ 15m) in abrasive or uneven formations
- Port, railway, and road subgrade reinforcement in hard soil/rock regions