Methods and apparatus for installing conduit underground

Details Methods and apparatus for installing conduit underground Methods and apparatus for installing conduit underground

2011-07-12

2011-07-12

Mayo-Pinnock, Tara (Department: 3672)

Hydraulic and earth engineering

Subterranean or submarine pipe or cable laying, retrieving,...

Advancing subterranean length of pipe or cable

C405S174000

Reexamination Certificate

active

07976243

ABSTRACT:
Apparatus and methods for forming an underground passageway and simultaneously laying therein a conduit or other elongate components comprises a rotary drill member coupled to a rotary and axially movable drill stem. The coupling is one which virtually automatically enables the drill stem to be coupled to and uncoupled from the drill member and comprises interlocking driving lugs carried by the drill stem and the drill member. The driving lugs are sandwiched between telescoped portions of the drill member and the drill stem and thereby are reinforced by such portions of the drill stem and the drill member in such manner as to preclude movement of the driving lugs in both radially inward and radially outward directions.

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