Method of multistage manufacturing a ground bore
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United States of America Patent
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Feb 22, 2011
Grant Date -
Oct 2, 2008
app pub date -
Mar 28, 2008
filing date -
Mar 29, 2007
priority date (Note) -
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Abstract
In a method for multistage manufacture of a borehole between two earth shafts, a drilling device drills in a first direction a pilot bore between a starting shaft and an end shaft and lines the pilot bore with pipes. Subsequently, the pilot bore is expanded in a second direction opposite to the first direction to form an expansion bore which is simultaneously lined with pipes, while accumulating soil is transported into the end shaft in opposition to the second direction with the aid of a screw conveyor.
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