Rock bolts are steel/aluminum/polymer/glass elements designed to anchor and stabilize rocks and soils during excavation of tunnels and slopes. These active reinforcing elements are intended to react to rock mass movement, develop a restraining force which is transferred back to the rock mass. In this way the driving force is counteracted and ultimately a balanced condition is reached where the total resistance mobilized within the rock mass is not less than equal to the applied force.

Several types of rock bolts / soil nails are available:

• CKT solid threaded bars

• Bolt with drill bit:

  Self drilling hollow bars – R type

  Self drilling hollow bars - Titan type

• Friction expansion bolts
• Glass fiber bars bolts