Augerless boring system

Details Augerless boring system Augerless boring system

1996-04-12

1998-01-27

Tsay, Frank

Boring or penetrating the earth

Tool removable or insertable through or around driving or...

175171, E21B 1064

Patent

active

057113858

ABSTRACT:
An augerless boring system uses a relatively slender drill steel pipe attached at a front end to a large tubular hammer. The hammer holds different drill bits. The drill steel and the hammer are located inside a casing and driven along with the casing by a power and advance unit. The hammer extends through a front stabilizer head attached to the front end of the casing. A stabilizer head improves drill bit control while supporting the boring assembly in the casing. The stabilizer head includes multiple stabilizer bars extending lengthwise along the inside of a stabilizer casing. A special thrust adapter is used for pushing the casing in a forward direction and attaches to a size adapter that provides forward pressure against substantially the entire rear end of the casing. The thrust adapter in combination with the size adapter provides even distributed pressure to the rear end of the casing for more effective thrust of the casing into a bore hole. A special flushing system is used for augerless removal of pulverized material from the casing.

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Technical Evaluation Report developed by Jim Brotherton and written by Jason E. Lopez and completed on Aug. 1, 1994.

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