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Pile dynamics improves testing

Pile Dynamics claims to have developed a new system that improves the process of carrying out cross-hole sonic logging (CSL) by automating the work.

CSL is one of the most popular testing methods for evaluating the integrity of drilled shafts and involves inserting probes - two at a time - into tubes built into the shafts especially for the test. The probes, which are mounted on spooled cables, are lowered to the bottom of the shafts and pulled back up.

As they travel along the shaft, one of the probes emits a sonic wave, and the receiver probe picks it up after it travels through the concrete. The intensity and time of arrival of the wave at the receiver probe is indicative of concrete quality.

The test is typically performed in shafts with at least four access tubes, but sometimes as many as 10, when using manual methods can make the process laborious for site engineers. The test procedure requires the tubes to be filled with water and tests are carried out between all possible paths between tubes. Even using water-resistant gloves, many engineers report that it can be uncomfortable pulling the wet cables by hand once a few of the tests are completed.

Pile Dynamic’s new Motorised Probe Deployment CSL system features automated reels that remove the need for manual handling and ensures that the data is accurate by delivering a consistent speed and removing potential for the probes to be pulled out too fast or too slow. The system is powered by an eight-hour duration battery or an external 12V power source.

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