Apparatus for making underground passages

Details Apparatus for making underground passages Apparatus for making underground passages

1975-08-12

1976-10-19

Novosad, Stephen J.

Boring or penetrating the earth

Boring without earth removal

175409, 175 61, 299 33, E21B 1102

Patent

active

039865681

ABSTRACT:
The apparatus has an annular body of reinforced centrifugally cast concrete. The leading axial end of the body is provided with a cover of sheet steel which forms a soil-penetrating cutting edge, and the trailing axial end of the body is provided with a steel reinforcing ring and with circumferentially spaced recesses into which respective pressure-exerting instrumentalities can engage, which serve to press the body into the soil and to control its direction of penetration in the same.

REFERENCES:
patent: 887952 (1908-05-01), Milligan
patent: 1853379 (1932-04-01), Rottinoff
patent: 1948707 (1934-02-01), Gilman
patent: 1948733 (1934-02-01), Robertson
patent: 2019719 (1935-11-01), Miller
patent: 2182477 (1939-12-01), Hollingsworth

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