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. This configuration ensures concentrated impact force, exceptional wear resistance, and prolonged service life even in rock with compressive strength up to 200 MPa.
High-Strength Steel Body
Manufactured from quenched-tempered alloy steel (e.g., 42CrMo, 35CrNiMo, HRC 32–38), the body offers superior torque resistance and compatibility with self-drilling anchor rod threads (R32, R38, T38, etc.).
Integrated Grouting Channels
Internal hollow channels (diameter 8–20mm) with side outlets ensure unobstructed grout flow during drilling, preventing debris blockage and reinforcing the bond.
Key Functions & Working Principle
1
Secure Connection: Threaded to the front end of the self-drilling anchor rod, forming a rigid assembly with the drill rig.
2
Efficient Drilling: Driven by rotational torque and axial thrust, the TC buttons crush hard rock via impact force while discharging debris.
3
Synchronous Grouting: Grout is pumped through the anchor rod's hollow core and ejected through the bit's channels to fill the borehole in real time.
4
Stable Anchoring: Once cured, the system forms a high-strength composite providing reliable tensile and shear resistance.
Application Scenarios
- 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 (subway, highway tunnels).
- Deep anchoring (depth ≥ 15m) in abrasive or uneven formations.
- Port, railway, and road subgrade reinforcement in hard soil/rock regions.
Frequently Asked Questions (FAQ)
Q1: What makes TC Button Bits suitable for hard rock drilling?
The use of high-grade Tungsten Carbide inserts with a hardness of HRC ≥ 90 allows the bits to withstand extreme impact and abrasive forces found in rocks with compressive strengths up to 200 MPa.
Q2: Can these bits handle simultaneous drilling and grouting?
Yes, they feature integrated internal hollow channels and side outlets specifically designed to allow grout to flow through the bit while drilling is in progress.
Q3: What types of threads are compatible with the TC Button Bit?
The bits are designed to be compatible with standard self-drilling anchor rod threads including R32, R38, T38, and custom API thread configurations.
Q4: How does the bit contribute to borehole stability?
The optimized button arrangement ensures straight boreholes, while the synchronous grouting fills gaps immediately, reinforcing the surrounding rock/soil during the process.
Q5: In what depth of anchoring are these bits most effective?
While versatile, they are particularly effective for deep anchoring projects (depths ≥ 15m) where maintaining penetration speed and tool durability is critical.
Q6: What is the benefit of the spherical button design?
The spherical or hemispherical shape provides a concentrated impact force for crushing hard formations and offers superior wear resistance compared to standard sharp edges.
KAT DRILLING
