Composite Rock Bolts & Soil Nails
Pulwell composite rock bolts and soil nails are manufactured from high-strength sand-coated FRP rebar or rough-surface composite dowels, combined with plastic or steel anchors and bearing plates to form a complete and effective ground support system. These systems are specifically designed for applications requiring high tensile capacity while leveraging the unique performance advantages of fiber-reinforced polymer materials .
Unlike conventional steel rock bolts, FRP rock bolts do not corrode and can be safely cut during subsequent excavation. This makes them particularly suitable for mining, tunneling, and foundation works where future excavation or machine cutting is expected.
Material Design and System Components
Pulwell composite rock bolt and soil nail systems typically include:
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Sand-coated or rough-surface FRP rebar or dowel
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Plastic or steel anchors
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Bearing plates for load distribution
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Optional hybrid fiber configurations (glass fiber and basalt fiber)
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Optional steel end connections for proof loading and installation
The system design maximizes anchoring efficiency while maintaining the lightweight and corrosion-resistant benefits of FRP .
Key Features and Advantages
| Feature | Description |
|---|---|
| Lightweight / High Strength | High tensile capacity with reduced handling weight |
| Fire Retardant & Anti-Static | Suitable for underground and mining environments |
| Easy Cutting | Can be cut by standard excavation equipment |
| High Corrosion Resistance | Ideal for aggressive and wet ground conditions |
| High Anchoring Strength | Sand-coated and rough surfaces improve bond |
| High Torque Strength | Supports installation and tensioning requirements |
These characteristics reduce downtime, labor intensity, and equipment wear compared with steel systems .
Why FRP Rock Bolts Are Preferred Over Steel
| Aspect | FRP Rock Bolts | Steel Rock Bolts |
|---|---|---|
| Corrosion Resistance | Excellent | Limited |
| Weight | Light | Heavy |
| Cutability | Easy | Difficult |
| Equipment Damage Risk | Low | High |
| Handling & Installation | Easier | More labor-intensive |
| Long-Term Durability | High | Reduced in corrosive ground |
Conclusion:
FRP rock bolts provide safer, more efficient ground support in environments where corrosion and future excavation are critical concerns.
Applications
Strata Support in Mining and Tunneling
Pulwell fiberglass rock bolts are widely used in mining and tunneling operations where subsequent excavation is planned. Their high tensile capacity and relatively low shear strength compared to steel make them ideal for temporary and semi-permanent ground support. Because they are easily cut, they reduce machine downtime and prevent damage to expensive mining equipment .
Slope and Face Stabilization
Pulwell composite soil nails manufactured with epoxy resin and fiberglass or basalt fiber are used in slope and face stabilization as permanent alternatives to steel. Their corrosion resistance ensures long-term performance in exposed soil and rock environments .
Temporary Ground Support with Future Excavation
In foundation pits and deep excavations where ground support elements must be removed or cut due to future easements or construction stages, GFRP soil nails and rock bolts are ideal. They can remain in place and be easily cut by standard construction equipment, saving significant labor and equipment costs while eliminating the need for heavy lifting machinery .
Steel End Connection System
Pulwell has developed hybrid steel end connections for multiple FRP bolt sizes. These systems:
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Combine plastic and steel components
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Utilize standard UNC steel hardware
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Allow easy job-site installation and proof loading
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Preserve the corrosion-resistant benefits of FRP
This hybrid solution provides installation flexibility while maximizing overall system performance .
Installation and Handling Considerations
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Lightweight components reduce manual handling effort
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Compatible with standard drilling and grouting methods
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No corrosion protection coatings required
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Easily cut during excavation or tunneling operations
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Reduced need for heavy lifting equipment
These benefits contribute to faster project execution and lower total construction costs.
Frequently Asked Questions (FAQs)
Q1: Why use fiberglass rock bolts instead of steel?
They eliminate corrosion, reduce weight, and can be safely cut during excavation.
Q2: Are FRP rock bolts suitable for mining applications?
Yes. They are widely used in mining and tunneling where future cutting is required.
Q3: Can Pulwell soil nails be used as permanent support?
Yes. Composite soil nails are suitable for permanent slope and face stabilization.
Q4: Do FRP rock bolts damage excavation equipment?
No. They are easily cut and do not damage cutting heads.
Q5: Are hybrid fiber options available?
Yes. Rock bolts with basalt fiber and glass fiber combinations are available.
Q6: Can standard hardware be used for installation?
Yes. Pulwell’s steel end connection system supports standard UNC hardware.
