Traction boring device using multiple trepans for producing larg

Details Traction boring device using multiple trepans for producing larg Traction boring device using multiple trepans for producing larg

1995-03-16

1996-11-05

Bagnell, David J.

Mining or in situ disintegration of hard material

Processes

Forming blocks

125 1601, 299 411, E21C 2510, E21C 3104, B28D 106

Patent

active

055709346

ABSTRACT:
A multiple trepan boring device for producing substantially large cuts in large works, such as concrete dams, comprises a drilling shaft adapted to be translationally displaced along its longitudinal axis and carrying a series of spaced apart cylindrical rotatable trepans each having a peripheral cutting surface and an annular cutting surface, the latter extending in plane perpendicular to the axis of the shaft and radially between the shaft and the peripheral cutting surface. Weights apply continuous downwards forces on the shaft and thus on the trepans. With the trepans resting on the top of the work to be cut, the trepans are rotated in place, and under the aforementioned forces the peripheral cutting surface of each trepan bores a hole until the shaft rests on the top of the work. Then the shaft is displaced translationally while the trepans continue to rotate thereby causing the annular cutting surfaces to remove a layer of the work extending between the shaft and the peripheral cutting surface. This procedure is repeated so as to produce a cut of a width corresponding to the outside diameter of the trepans by successive removal of crescent-shaped layers from the work. After the removal of each layer, the shaft is lowered along a distance corresponding to the difference in radii between the drilling shaft and the trepans.

REFERENCES:
patent: 207374 (1878-08-01), Webster
patent: 3675972 (1972-07-01), Slomito
patent: 3982521 (1976-09-01), Bieri
patent: 4962967 (1990-10-01), Hinkle

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