Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1995-12-26
1998-09-29
Dang, Hoang C.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 62, 175 73, 175171, 405143, E21B 706, E21B 720, E21D 908
Patent
active
058134824
ABSTRACT:
An earth boring system is disclosed for guiding and steering a string of pipe casings to form an underground cased bore. The string of pipe casings are guided by a boring end assembly including a front casing and a steering head connected at an interface gap by a plurality of hinge assemblies each having an actuator and a pair of connector parts. A protective enclosure protects the hinge assemblies from loosened earth from the earthen bore and from the earth being removed from within the pipe casings. The protective enclosure can be formed by an inner pipe and an outer pipe of both the front casing and the steering head, plus a closure ring and a retainer belt at the interface gap. Guidance sensors are provided to determine the location of the string of pipe casings and a computer control center computes steering head axial and angular displacements for guiding the string of pipe casings and controlling the extent of the interface gap.
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Dang Hoang C.
Flint Cort
Reed Robert R.
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