MONITORING COMPACTION OF BACKFILL

摘要

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.