Self Drilling Anchor Bar System
What's SDA Bar System ?
A self drilling anchor bar system is a complete ground support solution designed for unstable, fractured, or collapsing ground conditions where conventional pre-drilling is difficult or impossible.
The hollow anchor bar functions simultaneously as a drill rod, grout conduit, and permanent load-bearing anchor, allowing faster installation, improved safety, and reliable performance in complex geological conditions.
Key benefits of R Thread anchors:
- No pre-drilling required in unstable ground
- Faster installation and reduced labor cost
- Reliable performance in loose and fractured soils
- Improved grout bonding and load distribution
- Reduced construction risk and downtime
SDA System Components
- 01 Hollow Anchor Rod: Threaded hollow steel rod used for drilling, grouting, and permanent anchoring with high tensile .
- 02 Drill Bit: Sacrificial drill bit for efficient penetration, available in cross, button, or clay types matched to anchor size.
- 03 Centralizer: Steel plate distributing anchor load evenly to the supported structure or ground surface.
- 04 Coupler: Threaded steel coupler connecting anchor rods to achieve greater drilling depth and continuous load transfer.
- 05 Anchor Nut: Heavy-duty threaded nut securing the anchor system after installation and ensuring reliable load transmission.
- 06 Anchor Plate: Cement-based grout injected through the hollow core to bond surrounding ground and provide corrosion protection.
Self Drilling Anchor Bar System Specifications
| Anchor Type | Thread Type | Nominal Diameter | Typical Length | Yield Strength | Typical Applications |
|---|---|---|---|---|---|
| R25 | R-Type (Rope Thread) | 25 mm | Customizable | ≥ 500 MPa | Slope stabilization, light tunneling |
| R32 | R-Type (Rope Thread) | 32 mm | Customizable | ≥ 500 MPa | Tunnel support, foundation works |
| R38 | R-Type (Rope Thread) | 38 mm | Customizable | ≥ 500 MPa | Mining, rock reinforcement |
| R51 | R-Type (Rope Thread) | 51 mm | Customizable | ≥ 500 MPa | Heavy load anchoring, deep foundations |
| T25 | T-Type (Trapezoidal Thread) | 25 mm | Customizable | ≥ 500 MPa | Soil nailing, slope support |
| T30 | T-Type (Trapezoidal Thread) | 30 mm | Customizable | ≥ 500 MPa | Tunnel excavation support |
| T40 | T-Type (Trapezoidal Thread) | 40 mm | Customizable | ≥ 500 MPa | Mining reinforcement |
| T52 | T-Type (Trapezoidal Thread) | 52 mm | Customizable | ≥ 500 MPa | Heavy ground support |
Custom Self Drilling Anchor Bar System
OEM Self Drilling Anchor Bar System
Sdarockbolt support comprehensive customization services:
Anchor length and diameter
Thread type and pitch
Surface treatment and corrosion protection
Packaging and labeling
Project-specific technical requirements
Our engineering team works closely with customers to deliver optimized anchoring solutions.
Material & Corrosion Protection Options
To meet different environmental and project requirements, we offer multiple material and surface treatment options:
Base Material: High-strength alloy steel
Surface Finishes:Black / Plain, Hot-dip Galvanized, Epoxy Coated
Corrosion Resistance Levels:
Suitable for temporary or permanent ground support applications.
Self Drilling Anchor Bar System Applications
Self drilling hollow grout anchors are widely used in: Tunnel and underground excavation support, Slope stabilization and landslide prevention, Mining and rock reinforcement, Foundation and underpinning works,Rock bolting in difficult geological conditions
Soil Nailing
Tunnel and Metro Support
Slope Stabilization in Highways
Buildings Foundation Reinforcement
Underground Mining Support
Self Drilling Anchor Bar System vs Conventional Anchoring
| Item | Self Drilling Anchor Bar | Conventional Anchor |
|---|---|---|
| Pre-drilling Required | No | Yes |
| Installation Speed | Fast | Slow |
| Ground Adaptability | High | Limited |
| Borehole Stability | Excellent | Poor in loose ground |
| Overall Cost | Optimized | Higher in difficult ground |