Monitoring compaction of backfill
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United States of America Patent
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Apr 21, 1992
Grant Date -
N/A
app pub date -
Mar 8, 1990
filing date -
Mar 8, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Methods and apparatus for monitoring the compaction of backfill material in an excavation include hammer structure for impacting backfill material in the excavation, a sensor module for disposition at the bottom of the excavation to be backfilled that includes a transducer for developing an electric signal in response to energy transmitted through backfill material from the hammer structure, and a control module responsive to electric signals from the sensor module for providing an indication of the quality of compaction of backfill material in the excavation.
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