Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1986-05-16
1987-09-22
Novosad, Stephen J.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 19, E21B 414, E21B 420, E21B 708
Patent
active
046949135
ABSTRACT:
Long utility holes, for gas lines, electrical conduit, communications conduit and the like, may be bored or pierced horizontally through the earth, particularly under obstacles, such as buildings, streets, highways, rivers, lakes, etc. Such holes may be bored by an underground drilling mole (underground percussion drill) supported on a hollow drill rod and supplied with compressed air through the rod to operate an air hammer which strikes an anvil having an external boring face, preferably constructed to apply an asymmetric boring force. The drill rod is operated by a drill rig on the surface or recessed in special pit for horizontal drilling and provides for addition of sections of pipe or hollow rod as the boring progresses. The asymmetric boring force causes the boring path to curve and, when straight line drilling is needed, the drill rod is rotated to counteract the asymmetric boring force. An alternative boring tool utilizes an expander supported on a solid or hollow drill rod and having a base end supported on and larger in diameter than the rod and tapering longitudinally forward therefrom. It may have a uniform extension protruding a short distance forward. The tool penetrates the earth upon longitudinal movement of the drill rod.
REFERENCES:
patent: 1894446 (1933-01-01), McKenny
patent: 2181284 (1939-11-01), Potts
patent: 2517494 (1950-08-01), Kiss et al.
patent: 3905431 (1975-09-01), Hasewend
patent: 4117895 (1978-10-01), Ward et al.
patent: 4135588 (1979-01-01), Wagner
patent: 4144941 (1979-05-01), Ritter
Herben William C.
Maurer William C.
McDonald William J.
Pittard Gerard T.
Wasson Michael R.
Bui Thuy M.
Gas Research Institute
Mosely Neal J.
Novosad Stephen J.
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