Protection ring against damage to convergence-bolt

For blasting operations, our convergence measuring bolts can be fitted with a welded on protective ring made of steel. The prism holder is then located deep within the ring and protected from stone impact.  

The attached anchors (Ø 8 x 220mm) fitted transversely to the bolt axis, allows simple attachment to the reinforced mat. Using the optionally available closing plugs made of Styrofoam you can prevent the pene-tration of sprayed-on concrete into the protective ring.The closing plugs are suitable for use with both the 5KB and 5KBW designs.

The design with the explosive protection ring is only fitted when requested in the order, we require approximately 2 days for their manufacture.