What's principle about 3D acoustic wave CT of foundation piles?
The acoustic wave CT of the foundation pile generally puts the acoustic wave probe into the prefabricated acoustic tube of the foundation pile, and pulls the cable from the bottom to the top or from the top to the bottom (the general operation is convenient to lift it from the bottom to the top). Acoustic fluoroscopy CT was performed with a sonic probe in the measuring tube.
There may be 2 acoustic tubes, 3 acoustic tubes, 4 acoustic tubes etc. buried in one foundation pile. If there are more than 4 acoustic tubes, you can repeat the observation with a combination of 4 acoustic tubes.
Schematic diagram of sonic CT and acoustic tube arrangement of foundation piles
Generally, the sound tube in the north direction is numbered 1, and then the sound tube is numbered clockwise.
When performing a field sonic CT of a pile in the field, the diameter of the acoustic tube is about 0.05 m (that is, 5 cm). In the field, when collecting data from the acoustic CT of the pile, the distance between the outer edges of the two acoustic tubes is measured.