FRP Rock Bolt: Advanced Ground Support Solution

Product Description

FRP rock bolts (Fiber Reinforced Polymer rock bolts), also known as GFRP (Glass Fiber Reinforced Polymer) rock bolts, are structural support elements used for reinforcing and stabilizing rock formations. Manufactured from continuous glass fibers embedded in a polymer resin matrix (polyester, vinyl ester, or epoxy), these bolts are used in underground mining, tunneling, and civil engineering applications. FRP rock bolts combine tensile strength with lightweight properties and corrosion resistance, providing an alternative to traditional steel bolts in environments where non-conductive and cuttable support is required. Available in solid (fully threaded bars for bonding with grout or resin) and hollow configurations (for simultaneous grouting), they can be cut with standard mining equipment and are electrically non-conductive.

Technical Specifications

Parameter
Specification

Nominal Diameter
16–32 mm (Common: 18, 20, 22, 24, 27 mm)

Cross-Section Area
310–563 mm² (for 20–32 mm)

Length
1200–3000 mm (custom available)

Standard Hole Diameter
26–27 mm for 20 mm bolts

Material
Glass fiber + resin (polyester, vinyl ester, epoxy)

Density
1.6–2.2 g/cm³

Mass per Meter
642–1,156 g/m (for 20–32 mm)

Weight
Approximately 25% of steel equivalent by weight

Tensile Strength
600–1,000 MPa

Tensile Load
140–350 kN (varies with diameter)

Shear Strength
150 MPa (consistent across sizes)

Torsion (Torque)
40–200 Nm (higher for larger diameters)

Ultimate Strain
2–2.5%

E-modulus
40 GPa

Surface Treatment
Fully threaded, ribbed, sand/resin-coated

Plate/Nut Load Strength
70–110 kN

Thread Direction
Left or right (customizable)

Thread Distance
10–12.7 mm

Color Options
Black, white, yellow, red, green

Antistatic Resistance
3 × 10⁷ Ω

Flame Resistance
Flaming ≤6s, flameless burning ≤60s

Corrosion Resistance
Resistant to aggressive environments

Applications & Use Cases

Mining Operations

Roof and Wall Support: Used in active mining areas and allows cutting during advance operations.
Temporary Support Systems: Suitable for areas requiring later extraction with standard mining equipment.
Special Environment Applications: Used in high-humidity or chemically aggressive mine environments where steel may deteriorate.

Tunneling Projects

Permanent Reinforcement: Provides long-term stability with low maintenance requirements.
Breakthrough Zones: Used in areas requiring future expansion or connection.
Water Management Support: Contributes to tunnel waterproofing systems with corrosion-resistant properties.

Civil Engineering

Slope Stabilization: Secures unstable slopes with weather-resistant reinforcement.
Foundation Enhancement: Improves bearing capacity in soft or loose rock conditions.
Existing Structure Reinforcement: Repairs and strengthens bridges, buildings, and retaining walls.

Product Characteristics

Technical Advantages

Corrosion Resistance: Resists rust and chemical degradation in aggressive environments.
Strength-to-Weight Ratio: Delivers 600–1,000 MPa tensile strength with loads up to 350 kN while weighing 642–1,156 g/m.
Dimensional Accuracy: Cross-sectional area of 310–563 mm² supports consistent installation.
Electrical Non-Conductivity: Non-conductive properties make them suitable near power systems or in electrically sensitive areas.

Practical Benefits

Cuttability: Can be cut by standard mining equipment without damaging cutting elements.
Installation Compatibility: Fits standard 26–27 mm drill holes (for 20 mm bolts) and works with conventional anchoring methods.
Versatile Thread Options: Available with left or right thread direction and 10–12.7 mm thread distance.
Flexible Design Options: Multiple surface treatments (ribbed, sand-coated, resin-coated) and colors (black, white, yellow, red, green).

Safety Features

Fire Resistance: Meets safety standards with minimal flaming (≤6s) and flameless burning (≤60s).
Antistatic Properties: 3 × 10⁷ Ω resistance helps reduce static electricity buildup.
Chemical Stability: Resistant to acids, alkalis, and other aggressive substances.
Fatigue Resistance: 2–2.5% ultimate strain allows accommodation of rock movements.