Expandable Rock Bolts

Minova Expandable Rock Bolts (EXRB) offer fast and reliable rock reinforcement with assured quality and guaranteed mechanical properties.
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.
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Advantages
- 1 Energy efficient steel production
- 2 EXRB may be supplied with a protective coating
- 3 High product quality control
Product Feature
High quality raw materials
Short lead times
Reliable logistics
Production according to ISO 9001 & ISO 14001
QA and certified engineered rock reinforcement product
Full production chain customization on request
Trace-ability throughout the manufacturing process
The difference between the EXRB and EXRB+ is the elongation characteristics:
• the EXRB (cold formed type) has an elongation of A5 or approximately 15%
• EXRB+ (cold formed and normalized type) has an elongation of A5 or approximately 30%.
The EXRB+ is made of unique steel which goes through a specially developed annealing process, giving the bolts their exceptional elongation characteristics while still maintaining their high load bearing capacity. This process gives the EXRB+ superior properties allowing it to accommodate large rock deformation even in highly deformable rock masses.

EXRB are available in two types, EXRB (cold formed) and EXRB+ (cold formed and normalized). Each type is available in three different load bearing capacities:
EXRB 120 / 120+ 12 metric tonnes
EXRB 160 / 160+ 16 metric tonnes
EXRB 240 /160+ 24 metric tonnes
Industry sectors
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Coal Mining
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Hard Rock Mining
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Construction
Common use
- Anchoring
Available Regions
- North America
- South America