Occasionally, it might be necessary to drill holes longer than the standard rod length used, i.e. drilling investigation holes, holes for grouting etc.
For this purpose, Sandvik has developed the SCR rods retainer system that allows to add several rods on the feed, to drill longer holes.
Sandvik Rod Retainer SCR can be fitted on Sandvik Tunneling drills feeds (TF, TFi) with HLX5, RDX5 and RD500 series rock drills. SCR is not available with TFX feed.
Additional rods have to be loaded manually in the gripper. A safety wire is installed near the SCR to allow immediate emergency stop in case of issue.
The design of the SCR rod retainer aims at simplicity of structure and ease of maintenance. SCR is a robust welded steel structure with two movable jaw pieces. The jaw pieces are made of hardened steel and designed for optimum visibility and durability.
The key benefit of SCR in addition to effective holding of the rods is the ability to keep the rod centralized in the middle of the feed front centralizer while clamping. The grip is tighter and better suited for the rod coupling than a non-centralizing retainer (i.e. TRR1).
The SCR conversion kit is delivered with all needed parts including new controls (hydraulic or electro-hydraulic according machine model) and hoses harness.