Thorbolt

Thorbolt is a rock reinforcement system involving dynamic bolting that enables cement-cast rock bolts in water-bearing holes, which is not possible with conventional rock bolts.

Cement paste is pumped through the Thorbolt, pushing out air and water through the evacuation pipe, after which the hole and surrounding cracks are filled. The Thorbolt is molded into the rock with cement paste and comb steel and is corrosion resistant. Normally, no maintenance work is required and the Thorbolt will remain mounted in the rock until the tunnel is demolished.