Method of improving ground of large area
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United States of America Patent
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Jun 23, 1992
Grant Date -
N/A
app pub date -
Aug 6, 1991
filing date -
Jan 27, 1989
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates to a method for improving the ground of a large area. The method comprises the steps of inserting a pipe into a hole previously dug in the ground, injecting a high pressure liquid and a ground improving injection liquid from an injecting apparatus attached to the tip of the pipe, drawing up the pipe, grouting the ground, and injecting the ground improving injection liquid to thereby form an underground columnar consolidation body for improving the ground. The drawing-up operation of the pipe is executed while applying vertical vibration to the pipe. Thus, a consolidation body of a large area for improvement of the ground is obtained without concave and convex portions.
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