Boring or penetrating the earth – Processes – Boring horizontal bores
Patent
1990-03-27
1991-02-19
Novosad, Stephen J.
Boring or penetrating the earth
Processes
Boring horizontal bores
175 45, 175 67, 175 73, 175400, 175410, E21B 708, E21B 718, E21B 4709, E21B 4712
Patent
active
049935038
ABSTRACT:
Boring apparatus for forming a generally horizontal underground passage for a utility conduit or the like that includes a tool head with elongated body structure and a cutting face of ellipto-conical form at one end of the elongated body structure. The cutting face has a major axis and a minor axis and cutting bit structure is fixed to and projects forwardly from the cutting face and extends substantially the full width of the cutting face generally along the major axis. The tool head also includes coupling structure for attaching the tool head to a drill string such that the cutting tool face is offset from the drill string axis. Structure in the cutting face defines a cutting fluid orifice adjacent the cutting bit structure for directing a high velocity jet of cutting fluid forwardly of the cutting tool face. The tool body is adapted to be advanced and concurrently driven in rotation to move the cutting face in orbital boring action about the drill string axis to bore an underground passage and to be advanced without rotation to produce a change in direction of the underground passage in the direction of offset from the drill string axis.
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Fischer Edward E.
Fisk Allan T.
Mann Thomas H.
Electric Power Research Institute
Novosad Stephen J.
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