Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Sectional guide or shaft having means to lock sections in...
Patent
1989-06-22
1990-10-23
Taylor, Dennis L.
Boring or penetrating the earth
Means traveling with tool to constrain tool to bore along...
Sectional guide or shaft having means to lock sections in...
175 73, 175 61, 405154, 405138, E21B 708
Patent
active
049644742
ABSTRACT:
A flexible tunneling apparatus has an articulated thrust rod made up of a plurality of substantially identical tubular elements having complementary end surfaces, the elements being disposed in end-to-end relation and strung on a cable which is tensioned to effectively integrate the elements to form the rod. The rod is inserted into a tubular guide member which extends axially through and along the sidewall of a shaft. At one end the tubular guide member defines a rounded 90 degree turn causing flexure of the rod and diverting it to a path perpendicular to the axis of the shaft. Repetitive thrusting and retraction of the rod create a tunnel extending radially with respect to the axis of the shaft.
REFERENCES:
patent: 2694549 (1954-11-01), James
patent: 2726847 (1955-12-01), McCune et al.
patent: 3011568 (1961-12-01), Grimm
patent: 3958649 (1976-05-01), Bull et al.
patent: 4442908 (1984-04-01), Steenbock
patent: 4446932 (1984-05-01), Hipp
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