Method and a machine for advancing an underground face of a geol

Details Method and a machine for advancing an underground face of a geol Method and a machine for advancing an underground face of a geol

1974-12-05

1977-02-22

Purser, Ernest R.

Mining or in situ disintegration of hard material

Processes

Explosive

173 52, 299 19, E21D 900

Patent

active

040089223

ABSTRACT:
A method for driving tunnels in rounds is disclosed in which, after each round, the tunnel is left with an inclined transition to the floor. In the subsequent round, a cut is opened up in the transition towards the floor and the tunnel face is then stepwise drilled and blasted in cycles until the roof is reached and the round is completed. A machine for carrying out the method is disclosed which comprises a plurality of drill-and-blast units that are mounted on a frame that is pivotable about a transverse horizontal axis.

REFERENCES:
patent: 867284 (1907-10-01), Maxwell
patent: 922431 (1909-05-01), Japp
patent: 1789735 (1931-01-01), Fisher
patent: 1833368 (1931-11-01), O'Rourke
patent: 1833369 (1931-11-01), O'Rourke
patent: 2026627 (1936-01-01), Gilman
patent: 3473616 (1969-10-01), Johansson
patent: 3623771 (1971-11-01), Sonsnowicz
patent: 3721471 (1973-03-01), Bergmann et al.
patent: 3727867 (1973-04-01), Toppila

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