Pile QA has been commissioned to undertake Cross Hole Logging Test on Bored Piles of “MARPORT, Modernization and Extension Phase-2 project.
Cross-hole sonic logging (CSL) is one of several methods which are employed to assess the integrity of cast-in-situ piles. The testing is carried out following the guidelines outlined in ASTM-D6760 using the Pile Dynamics Inc. Cross Hole Analyzer device. During the construction, closed-ended PVC or steel tubes are installed around the inner perimeter of the steel reinforcement cage. The transceivers are then simultaneously lowered into a pair of access tubes. The first probe transmits a high-frequency signal that travels through the concrete and is detected by the second probe acting as a receiver. As the sensors move up and down along the foundation's length, the device records and displays the energy of the received signal and the time it takes to travel from emission to arrival as a function of depth. The quality of the concrete and the presence of any defects or anomalies in the concrete column can be evaluated based on the transmission time (the first arrival time, or FAT), and the relative proportion of the transmitted energy which is received.
