| Geotechnical Monitoring |  | Pile Testing | | Cross Hole Sonic Logging |
The Cross-Hole Analyzer is a non-destructive test used to determine the quality and consistency of the concrete of bored piles. A selected bored pile is pre-installed with steel tubes that span the whole axial length before casting. A transmitter lowered down into on tube sends a high frequency signal that travels through the concrete and is detected by a receiver in the second tube. As these sensors are raised and/or lowered along the length of the pile, The Cross-Hole Sonic Analyzer records at regular depth intervals the time that the signal takes to travel from the transmitter to the receiver (first arrival time), as well as the signal strength. These two parameters indicate the concrete quality between the pair of tubes at a particular depth. The entire shaft length is logged and the test is then repeated for each pair of tubes, allowing for a full and t
horough investigation of defects both along the length and by its quadrant.
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