Boring or penetrating the earth – Boring without earth removal
Patent
1994-08-22
1995-11-21
Dang, Hoang C.
Boring or penetrating the earth
Boring without earth removal
166301, 173 91, 175 57, E21B 414, E21B 726
Patent
active
054678315
ABSTRACT:
The invention represents a monotube differential pneumopercussive self-propelled reversible soil penetrating machine with stabilizers (100) having an increased efficiency, reliability, durability, and directional stability, and also a lower cost compared to existing machines. All of these achievements are associated in part with the development of an innovative monotube housing with rigidly secured to its outside surface structurally shaped longitudinal directional stabilizers, creating closed longitudinal air passages between the outside surface of the monotube housing and inside surface of the structurally shaped stabilizers. The invention offers a rigid connection of the air-distributing mechanism without use of any tail nuts, which simplifies the machine and reduces its cost. The chisel assembly is simplified and the overall weight of the machine is reduced. All this causes in a more efficient transfer of impact energy the housing and also more efficient use of the internal cross-sectional area of the housing in terms of developing an increased pressure force for the same outside diameter in comparison with the existing machines. The invention also offers a method of retracting a failed machine (100) from the underground hole by a similar or identical machine. The required for this method simple modifications of the rear and front parts of the machine (100) and appropriate accessories are also described in this invention.
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