Boring or penetrating the earth – Boring without earth removal – Fluid passage to exterior of drive point
Patent
1995-09-12
1997-12-09
Dang, Hoang C.
Boring or penetrating the earth
Boring without earth removal
Fluid passage to exterior of drive point
173 63, 173 91, 175 73, E21B 414, E21B 1038, E21B 704
Patent
active
056950144
ABSTRACT:
A ram boring apparatus has a generally cylindrical body with an attached head, the apparatus being connected to a drive rod which pushes the apparatus forwardly through the earth. The drive rod can also rotate the body and the attached head about the longitudinal axis of the apparatus, and operation of the apparatus can also be supported by the ejection of pressure fluid from one or more jets arranged on the head and by a hammering mechanism carried by a portion of the body. The hammering mechanism is activatable by pressure fluid from the same source as the pressure fluid supplied to the one or more jets. The pressure fluid is delivered through the hollow drive rod and a control valve in a fluid supply line in the body, in dependence on the pressure of the pressure fluid supplied to the apparatus, selectively directs the pressure fluid to the one or more jets in the head or simultaneously to both the one or more jets and to the hammering mechanism. A sender may be included in a portion of the body for the transmission of electromagnetic radiation by means of which the location and angular orientation of the apparatus can be determined from the surface of the earth or other remote location.
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Dang Hoang C.
Terra AG fuer Tiefbautechnick
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