SSAB ERB – Expandable Rock Bolts
Fast and reliable roof reinforcement with guaranteed mechanical properties
The reinforcement with ERB arrests crack formation and propagation. Reinforcing occurs by expanding i.e. hydroforming the bolt in the drilled hole with high water pressure against the drill hole wall. The expansion of the bolt creates a friction and interlocking anchor. There is immediate full length support for faster excavation, no waiting for grouting to set and no chemicals needed, only water.
After drilling the hole, installation of expandable rock bolts requires water pump to expand the bolt into the shape of the hole to create instant support. Installation is flexible to variations in drill hole diameter and other irregularities. Installation is clean and easy. There is no grouting or chemicals needed, which results in environmentally friendly installation.
Main advantages using ERB
- Environmental friendly, add only water
- Immediate full load bearing capacity
- Safe and easy installation
- Underground mines
- Road- and railway tunnels