One Step Bolting - Minova Global


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Minova One Step Bolting System Overview

This brochure features a broad overview of our One Step Bolting products and solutions.

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One Step Bolting Technology

Our bolting solutions are widely used in the infrastructure, tunneling and mining industries.

 Stabilises the rock and extends natural rock-arch

  • Actively prevents further loosening of the rock mass
  • Reduces rock deformation caused by excavation

There are many rock bolt types and grouting technologies to select. Choosing the appropriate one for the project is determined by geological conditions and design requirements. Factors include:

  • Rock type
  • Structural features:
    • Such as the presence of laminations, breaks, fissures and fractures in the rock
  • Strength and stiffness of the rock
  • Presence of water
  • Corrosive behavior of the rock
  • Life expectancy of the excavated area
  • Extraction height
  • Installation equipment
  • Access area

Rock bolts utilise the strength of the rock structure to be reinforced as support to the excavation made. Therefore the behaviors of the rock is fundamental to the selection of the bolts and the design pattern to be applied. The rock is the material under consideration and loads to be carried are represented by the rock stress field. There is a wide range of factors influencing design related to the rock being reinforced, life cycle of the excavation and the excavations methods.  These inputs to design will determine the selection of the bolt including diameters, lengths and bolt design also in consideration is the grouting materials required and final bolting pattern.

Deformation of rock (rock shift into excavated space) causes tension in the installed bolt. The resulting tensile load is transmitted to passive zones in the rock (stable rock). Due this principle the fully grouted/bonded rock-bolts are preferred over point-anchored rock-bolts.

General considerations when searching for rock-bolts

  • Capacity of bolt (tension - Yield / shear)
  • Optimal length (extension of self-support rock arch)
  • Optimal bolt grid / density of bolts
  • Adequate service-life of bolt (temporary/permanent)
  • Behavior of bolt under load (elongation/ creep)
  • Technology of bolt installation