Rock bolting system and method for reinforcing rock surfaces

EP4603675A1Inactive Publication Date: 2025-08-20SANDVIK MINING & CONSTRUCTION AUSTRALIA (PRODUCTION SUPPLY) PTY LTD
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Patent Information

Application Number
EP2024157578
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-02-14
Publication Date
2025-08-20
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing rock bolting systems using cement as a bonding agent face challenges with slow curing times and difficulty in automation, while injectable resins, though desirable, often require longer cable lengths due to reduced bond strength and increased elasticity, leading to debonding issues.

Method used

A rock bolting system featuring a helical cable with continuous grooves and a fillerless, thixotropic injectable resin bonding agent that locks into the grooves, providing improved bonding and allowing for shorter embedment lengths.

Benefits of technology

The system achieves enhanced bonding and reduced critical embedment length, enabling efficient and automated rock reinforcement with improved bond strength and resilience against torsional forces.

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Abstract

A rock bolting system (1) for reinforcing rock surfaces (2) is disclosed. The rock bolting system may comprise a cable bolt (3) for being inserted into a drill hole (4), the cable bolt comprising a helical cable (5), the helical cable comprising a plurality of outer wires (9) wound around a central core wire (10), wherein each of the outer wires has an outer surface (11) having a continuous helical groove (12); and a bonding agent (6) for being injected as grouting material into the drill hole, wherein the bonding agent is an injectable resin.
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Citation Information

Patent Citations

  • Reinforcing member

    US6779950B1

  • Non-tensionable cable bolt apparatus and related method

    US20110027019A1

  • Combination cable bolt system

    US5785463A