Anchoring is a method where walls with masses of overburden are anchored to the solid rock. Casing tubes are driven through the overburden. After that drilling is continued with normal drill bi. Steel cable is inserted to the bottom of the hole and next the hole is filled with grouting. New Robit Non-Stop Casing System is perfect for anchoring.
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Robit Rocktools - Casing system for Anchoring | NatokHD