Steel

ROCK REINFORCEMENT. SUPPORT.

Ground support solutions are essential foundations to the safety of underground operations are used in almost every mine today.

 

Rock reinforcement include methods that modify internal rock mass behaviours by installing structural elements that prevent further rock mass loosening, reduces deformation caused by excavating and stabilises the rock, extending the natural rock arch. This type of reinforcement is an active method of support that includes point anchored bolts, friction bolts and grouted bolts.

 

We offer a full range of solutions that address the requirements for increased life cycle, ranging from stainless steel bolts to specialist coatings and new technologies. We offer multiple coating solutions for a wide range of bolts that increase bolt lifespan while maintaining bolt performance. Due to varying geological conditions and project applications, a single bolt is unlikely to meet all requirements.

 

Advantages
  • SIMPLICITY OF USE
  • COMPREHENSIVE RANGE
  • INTERNAL TEST FACILITY

Related Products

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Friction Bolts

Friction bolts have been used internationally in mining for decades and are considered the simplest form of ground support available in metal mining. Compression of the high tensile steel "C" shape into a hole diameter smaller than the tube generates a load transfer from the steel to the rock. A steel ring is fixed to the collar end of the tube that will retain a plate on the installed tube to establish compressive force against rock.

Available in either black or hot dip galvanised. Variety of diameters (34 mm, 40 mm and 47 mm) and various lengths from 600 mm to 3,000 mm

Used in the development and production headings for immediate support with quick and easy installation.
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Coal Bolts

M24 Rock Bolts (also known as coal bolts) have been developed for use in point anchored or fully encapsulated roof and rib bolting applications. 

Manufactured with a rolled M24 x 3.0 mm pitch right hand thread and a ribbed surface profile. Suitable for high load transfer and easy resin and grout application. Supplied complete with an anti-friction washer, dome washer and hexagonal 36 mm drive nut. 

Recommended for use in 27 – 28 mm diameter holes. For >28mm diameter holes it is recommended to use Minova Secura bolt range.

Available in either standard “S” mild steel grade or extra high tensile “X” HSAC840 superior steel grade. X steel grade provides greater potential performance in conditions subject to stress corrosion cracking. Multiple lengths, diameters, pin and paddle configurations are available.

 

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Solid Bolts

The Secura Bolt is a solid reinforcing bar for use in strata environments of underground mines. Design includes a unique paddle system to improve resin mixing and resin film shredding. Consistent and efficient mixing of resin capsule components provide higher bond strength in large diameter boreholes  

The solid reinforcing bar is threaded at one end with a high strength R thread profile, including a modified rope thread with large root and small crest areas. A torque nut is attached at this end. Available in various lengths and can be supplied black or hot dip galvanised.

Variants available:

R24 Secura Bolt

R24 Secura Debonded Bolt

R28 Secura Bolt

R28 Secura Debonded Bolt

 

Click here to read our comparative testing information bulletin.

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Cable Bolts

Cable bolts offer significantly higher strength compared to traditional bolts, along with unparalleled flexibility to accommodate the movements of the earth’s strata.

The Minova cable bolt range includes:

  • Continuous roll or cut to length 15.2 mm
  • Plain and bulbed cables
  • Twin strand plain and bulbed cables
  • Resin anchored 21.8 mm diameter Superstrand
  • 50T fully bulbed strata cables
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Plates

Manufactured from high-strength steel and designed to help prevent loose material from falling between the roof bolt pattern and provide strength to your immediate roof.

Options of each plate type are available in numerous dimensions to suit any bolt type and diameter in the Minova range. Plates are available with or without a hanger loop in black steel or hot dip galvanised. 

Further developing our plate range, our 200 mm Crown plate is a cost-effective alternative to Combi plates, reducing the number of plates required and providing improved strata support.
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Steel Mesh

Mesh provides surface support coverage to loose rock between installed rock bolts in underground mining excavations. Multiple configurations of mesh is available including numerous sheet sizes, apertures, wire diameters and black or galvanised wire.

Ausro straps are yielding straps which allow the straps to yield under load conditions allowing better load distribution between bolts. Ausro straps are used in unstable ground conditions where seismic activity is present, to improve surface support and ensure better connection between the surface support and bolts.

 
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Steel & Mesh Accessories

In addition to a complete range of steel and chemical components, we can provide an extensive and complimentary range of accessories for steel strata support requirements.

Our range of accessories include:
• Strata Straps
• Mechanical Anchors
• Mine Nuts
• Couplings
• Pull Collars

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