Method of excavation and apparatus therefor

Details Method of excavation and apparatus therefor Method of excavation and apparatus therefor

1988-01-22

1989-06-13

Novosad, Stephen J.

Mining or in situ disintegration of hard material

Processes

Forming blocks

299 73, E21C 2516

Patent

active

048386146

ABSTRACT:
A tunnel is constructed by progressively cutting away a predetermined depth of rock from a face using rotary diamond saws. Slots are cut into the face (12) at an acute angle to the face such that first slots intersect second slots to detach blocks from the face. In one embodiment, the cutter (29) is mounted on a slide which can traverse an elongate guide 26. The guide is carried on an arm (24) which can swivel about its own longitudinal axis. A series of angularly spaced slots are cut into the face through 360.degree. with alternate slots being cut at opposite acute angles to the face so that they intersect. A cylindrical tunnel is produced.

REFERENCES:
patent: 2390562 (1945-12-01), Storrs
patent: 3306663 (1967-02-01), Webster
patent: 3420577 (1969-01-01), Pentith
patent: 3433533 (1969-03-01), Webster
patent: 3550961 (1970-12-01), Hughes

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