Apparatus and method for cutting elongated slots in earth format

Details Apparatus and method for cutting elongated slots in earth format Apparatus and method for cutting elongated slots in earth format

1975-08-12

1977-11-22

Purser, Ernest R.

Mining or in situ disintegration of hard material

Processes

With material-handling

299 19, 299 66, 299 81, E21C 4700

Patent

active

040593096

ABSTRACT:
An apparatus for cutting a deep slot, having a large depth to thickness ratio, in earth formations, which includes two main components, a motive means and a cutting assembly; the motive means, such as a crawler tractor, supports the projecting end of the cutting assembly, supplies a small portion of the driving force needed to advance the cutting assembly, and provides, through various connections, power, control functions, and the fluids required for operation of the cutting assembly; and the cutting assembly, extending the full depth of the slot along its advancing edge, includes an elongated support, a reciprocating cutter bar mounted on the leading edge of the support, a passage incorporated in the support for transmitting a fluid, generally a high gel strength clay paste, along the support and discharging the fluid in the interior of the slot, in a sufficient amount and under sufficient pressure to resist the earth pressure tending to close the slot and to provide a major portion of the force necessary to move the cutting assembly forward against the advance edge of the slot.

REFERENCES:
patent: 2253941 (1941-08-01), Pray
patent: 2304143 (1942-12-01), Bigelow
patent: 3792906 (1974-02-01), Kuck
patent: 3892442 (1975-07-01), Janssen

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