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Tech support Expandable Rock Bolts

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

Applications

  • Underground mines
  • Road- and railway tunnels

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SSAB ERB guarantee high quality product with excellent delivery performance

SSAB has been a producer to several leading distributors of rock bolts since 1979, and with own steel manufacturing, profiling and assembly of final ERB product, we can guarantee excellent production control and high quality product.

Customer benefits

SSAB ERB guarantee high quality product with excellent delivery performance

SSAB has been a producer to several leading distributors of rock bolts since 1979, and with own steel manufacturing, profiling and assembly of final ERB product, we can guarantee excellent production control and high quality product.

SSAB’s expandable rock bolts consist of folded steel tube with upper bushing and inflation bushing welded at each end of the tube. Connector enables deep hole rock reinforcement.
Face plate can be delivered as option.

ERB requires extremely good elongation i.e. formability performance of the bolt. This enables fast and reliable reinforcement method, which is demanded as the safety requirements increase.

Customer benefits using SSAB produced ERB

  • Clean composition
  • High quality raw material
  • Consistent properties
  • Energy efficient steel production 
  • QA systems and Certificates
  • Full chain customization possible
  • Traceability through all processes

SSAB’s delivery performance is high thanks to well working logistics and short delivery times, which makes SSAB ERB desired and cost effective solution worldwide.

High performance product features

SSAB guarantees minimum breaking strengths and elongation levels for all expandable rock bolts. With ERB+ series, SSAB is a leading manufacturer of expandable rock bolts with elongation A5 ~ 30 %.
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