Omega Bolt ^®s

General Design / Manufacturing

The Omega Bolt ^® Type ERB 120, 160 and 240 is a temporary rock bolt for tunneling and mining.

It is shaped into a greek “Omega” out of a 2.0 or 3.0 thick strip metal according to EN 10149-2 for versions ERB 120, ERB 160 and ERB 240.

For versions ERB 120+, ERB 160+ and ERB 240+, which provide higher elongation capacity, metal strip of higher steel quality is used.

The Omega Bolt ^® is pushed into the borehole (phase 1) and expanded by high pressure water (phases 2-5).

The rock bolt is pressed onto the borehole wall due to elastic and plastic deformations of the tube.

Finally, the water pressure is released and bolt installation is completed (phase 6).

Thus, both immediate form closure and friction transfer are caused between the rock bolt and the borehole wall.

Values are based on the German Code (DIN). Adaptations to other code systems or concrete strengths (e.g. ASTM, BS, etc.) are possible.