Monitoring compaction of backfill
US5105650A · kind A · utility
8Cited by
21References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1990 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Mar 8, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0232
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.