Pre-bolting system for underground mines
OwnerRoger F. J. Adaminventor
Life of this patent
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Abstract
A pre-bolting system for underground mines which comprises narrow, deep slots in the working face and in drilling through at an angle and bolting from inside these slots with equipment specially designed for this purpose. The drilling, bolting equipment uses high pressure water to assist drilling by water jet. The bit can also be driven by an axial water turbine of small diameter located at the bit. The equipment includes a ventilation system to dilute gas inside the slot when drilling or bolting.
Claims10
In an underground mine having an entry and having a working face below roof strata, the method of prebolting said roof strata for reinforcement thereof before mining comprising cutting deep narrow vertical slots into said working face just below the roof strata to be reinforced, inserting a drilling tool and flexible drilling rod into each of said slots to drill a hole at right angles to, and upwardly of the roof strata and finally, removing said drilling tools and bolting the drilled holes through said slots.
Dependencies are inferred from the claim text.