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.
- Energy efficient steel production
- EXRB may be supplied with a protective coating
- High product quality control
- 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 120 / 120+ 12 metric tonnes
- EXRB 160 / 160+ 16 metric tonnes
- EXRB 240 /160+ 24 metric tonnes