27mm Fiberglass Rock Bolt – Advanced Ground Support Solution

Product Overview

The 27mm fiberglass rock bolt is a fiber-reinforced polymer (FRP) ground support system for mining, tunneling, and underground construction applications. As part of our FRP rock bolt collection, this composite bolt offers good strength, corrosion resistance, and electrical non-conductivity.

Related solutions: Explore our pultruded FRP profiles, FRP rebar, pultrusion machines and pultrusion dies.

This ground support solution is suitable for challenging environments where steel bolts may corrode, such as wet, chemically exposed, or electrically sensitive areas.

Technical Specifications

Performance Data

• Tensile Strength: High tensile capacity suitable for ground support applications
• Load Capacity: 125-380 kN (depending on length and configuration)
• Shear Strength: 45-74 kN
• Service Life: Long service life in non-abrasive, properly specified conditions

For detailed information about our manufacturing process, see our complete guide to pultruded profiles.

Key Advantages

Corrosion Resistance

Fiberglass construction resists many common underground conditions:

• Underground moisture and water
• Chemical exposure
• Salt environments
• Acidic conditions

Electrical Safety

Non-conductive properties provide:

• Very low electrical conductivity
• No sparking during installation or cutting
• Safer operation around electrical equipment
• Suitability for explosive atmospheres where specified

Strength-to-Weight Ratio

Lightweight design offers:

• Easier handling and transportation
• Reduced installation fatigue
• Good load capacity with lower weight
• Simplified logistics

Like all our pultruded FRP profiles, these bolts combine good strength with reduced weight for improved handling.

Primary Applications

Mining Operations

• Coal mining in gassy environments
• Hard rock mining support
• Shaft and tunnel reinforcement
• Areas requiring spark-free installation

Underground Construction

• Road and rail tunnel support
• Utility tunnel reinforcement
• Underground parking structures
• Subway and metro construction

Civil Engineering

• Slope stabilization projects
• Soil nail retaining walls
• Foundation anchoring
• Rock face stabilization

Installation Guidelines

Preparation

1. Drill Hole: 26-27mm diameter (maximum 28mm)
2. Depth: Slightly shorter than bolt length
3. Cleaning: Remove all debris from hole

Installation Process

1. Insert chemical anchor at hole bottom
2. Push bolt while rotating through anchor
3. Position washer and nut
4. Allow proper curing time
5. Apply specified torque

Critical Requirements

• Do not exceed 28mm hole diameter
• Maintain rotation during anchor penetration
• Follow chemical anchor manufacturer’s specifications
• Ensure adequate thread engagement

Fiberglass vs. Steel Considerations

Corrosion: Fiberglass resists many forms of corrosion, while steel may require coatings in aggressive environments.

Safety: Non-conductive and spark-free properties make fiberglass suitable for mining and electrical environments.

Performance: Good tensile strength and predictable failure characteristics support ground support designs.

Cost-Effectiveness: Long service life and reduced maintenance requirements can improve long-term value in suitable applications.

Quality Standards

Our 27mm fiberglass rock bolts are manufactured under quality control procedures:

• Consistent material composition
• Precise dimensional tolerances
• Regular performance testing
• Complete traceability documentation
• Industry standard compliance

FAQ

What is the tensile strength of 27mm fiberglass rock bolt?

27mm fiberglass rock bolts provide tensile load capacities from 125 kN to 380 kN depending on configuration. Specific capacity should be verified against project requirements.

What is the recommended installation hole size for 27mm fiberglass rock bolt?

Recommended installation hole diameter is 26-27mm (maximum 28mm). Proper hole sizing helps ensure optimal resin distribution and load transfer to the surrounding rock mass.

Why use 27mm fiberglass rock bolt instead of steel?

27mm fiberglass rock bolt is corrosion-resistant, approximately 75% lighter than steel by weight, TBM cuttable, and electrically non-conductive. These properties can eliminate rust issues, reduce transport costs, and prevent equipment damage during mechanized excavation.

What is the thread specification for 27mm fiberglass rock bolt?

27mm fiberglass rock bolt features full-length threading with 10mm pitch round head thread (right-hand direction). Nut/plate capacity should be verified for the specific application.

How is 27mm fiberglass rock bolt installed?

Drill 26-27mm hole to required depth, insert resin cartridge, place fiberglass bolt with nut/plate, rotate to mix resin, allow curing, then tension to specification.

What applications use 27mm fiberglass rock bolt?

27mm fiberglass rock bolt is used for tunnel face bolting, mine roof and wall support, slope stabilization, dam anchors, and foundation reinforcement in mining and civil engineering projects.

Is 27mm fiberglass rock bolt TBM compatible?

Yes. 27mm fiberglass rock bolt is cuttable by tunnel boring machine cutters without damaging tooling. This can reduce downtime associated with steel bolt encounters.

What is the shear strength of 27mm fiberglass rock bolt?

27mm fiberglass rock bolts provide shear strengths from 45 kN to 74 kN, supporting performance under lateral rock movement and shear forces in underground excavations.

Ideal For Projects Requiring

• Long-term stability in corrosive environments
• Electrical safety around power systems
• Spark-free installation in explosive atmospheres
• High strength ground support
• Low-maintenance operation
• Reliable performance in demanding conditions

Technical Note: For optimal performance, always follow project-specific engineering requirements and local safety regulations. Contact our technical team for application-specific guidance and load calculations.

The 27mm bolt is the heavy end of our full fiberglass rock bolt lineup, which starts at 18mm for lighter support duty.