Underground propelling method

Details Underground propelling method Underground propelling method

1997-07-01

1999-03-09

Dang, Hoang C.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

175 45, E21B 706

Patent

active

058788255

ABSTRACT:
An underground propelling method uses a propellant apparatus including a propellant head having a pressure receiving face portion inclined relative to an axis of the head and a plurality of propellant cylinders flexibly and pivotally connected in series to a rear end of the propellant head. The propellant apparatus is propelled under the ground by applying a thrust to the propellant apparatus from behind. Each propellant cylinder of the apparatus is pivotal about a single pivot axis thereof alone. The apparatus is propelled with the pressure receiving face portion thereof being oriented along a pivotal direction of the propellant cylinder about the pivot axis.

REFERENCES:
patent: 2687282 (1954-08-01), Sanders
patent: 3712391 (1973-01-01), Coyne
patent: 4062196 (1977-12-01), Yoshida et al.
patent: 4442908 (1984-04-01), Steenbock
patent: 4523652 (1985-06-01), Schuh
patent: 5085283 (1992-02-01), Seabourn et al.
patent: 5163520 (1992-11-01), Gibson et al.
patent: 5542482 (1996-08-01), Eddison

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