STEEL BOLTING TECHNOLOGIES

CTBs work much like Tension Rebar Bolts, but with the added benefit of being threaded the entire length of the bar, allowing for more versatility if ground conditions change.

Minova Continuous Thread Bolts work much like Tension Rebar Bolts which simplifies the type of equipment required during installation.

Continuous Thread Bolts are threaded the entire length of the bar, which allows for more versatility if roof or ground control plans change down the road. This versatile bolt can be used for roof/rib support, tunnelling and slope stabilisation support projects.

They boast the dual benefit of providing more control at a lower cost. 

The Double Lok Bolt does not require any special tools or installation techniques. Instead, when used with the proper Minova resin, the Double Lok Bolt expansion shell sets the initial anchorage and allows the resin to cure while the roof is in a state of compression. 

Additional anchorage for this system takes place along the interface of the bolt shaft, resin, and borehole wall. The “combination anchorage” of the expansion shell and resin has proven very successful for adverse ground conditions. 

Minova has developed this high-performance, cost effective bolting system to enhance resin mixing and minimize the potential for “glove fingering".

Glove fingering occurs when the film packaging within the cured resin is forced against the borehole wall to potentially interfere with the mechanical interlock of the resin and the rock mass. The offset head forces the bolt around the outside of the borehole wall, shredding the cartridge and increasing the mixing action.

Minova EXRB consists of a folded steel tube with upper bushing and inflation bushing welded at each end of the tube. A specially designed adjustable face plate is delivered as an option.

EXRBs require steel that has extremely good elongation and form-ability properties. This quality produces a finished bolt that accommodates large rock movements and still maintains its high load bearing capacity. EXRBs deliver a high level of safety and uninterrupted production in the customer’s operations.

The mine roof is effectively suspended by anchoring the different layers of strata together. The mine or tunnel roof is effectively suspended by anchoring the different layers of strata together.

Anchorage is accomplished with the assistance of an expansion shell. The Mechanical Bolt is tensioned during installation, which sets the expansion shell against the borehole wall. Mechanical Bolts are offered with a standard expansion shell or bail style expansion shell.

Matched Bearing Plate systems and Minova resin capsules are available for all Minova Rebar Bolts.

Minova Reinforcing Steel Bar (Rebar) is manufactured to critical tolerances and standards to meet the day-to-day needs of our mining customers. Our comprehensive quality control program ensures that each Rebar Bolt order arrives at your site just as you have specified. And, because Minova is a world leader in manufacturing, you can be assured that we will be able to fill your orders quickly and efficiently, regardless of the size of the delivery requirement.

Minova Rebar Bolts are made from grade 40, 60 and 75 steel and can be manufactured as bendable products for low seam applications.

Where better beam building is needed, the Tension Rebar Bolt System has strength characteristics to meet your needs.

Our know-how is the result of over 40 years of experience in the production and global supply.

The system features a hollow bar, which is used as a drill string for drilling either with water flush, air flush or cement grout flush.

All system components are rigorously tested according to stringent factory standards and ISO 9001 to ensure that the specifications are met. The sacrificial drill bit significantly enhances the productivity of the installation process. In order to improve performance and cost-effectiveness, project data are being collected from around the world.

Continuous optimisation of our drill bits is a primary concern to further improve the penetration rate and bit quality while at the same time reducing manufacturing costs. For improved corrosion resistance, Self Drilling Anchor components are either hot dip galvanised or fitted with a TwinCoat coating (hot-dip galvanisation with an additional dual epoxy coating).