Ultrasonic Penetration Pile Test Method
The sonic penetration measurement method is to pre-bury a number of acoustic tubes in the pile before pouring the concrete of the pile, as a channel for the ultrasonic pulse transmitting and receiving probe, and use the ultrasonic detector to measure the ultrasonic pulse through the point along the longitudinal axis of the pile. Acoustic parameters at each cross-section, and then use various specific numerical criteria or image judgments for these measured values. After processing, the pile defects and their locations are given to determine the pile integrity category.
The sonic penetration measurement method is suitable for concrete cast-in-place piles with acoustic pipes pre-buried.
Advantage & Disadvantage：
The sonic penetration test method can detect the quality of the concrete of each cross section of the whole pile length, whether the pile body has defects such as concrete segregation, mud entrapment, necking, poor compaction and broken piles. The results are more intuitive and reliable than the low strain method. The on-site operation is relatively simple, the detection speed is fast, and it is not limited by the long neck ratio and pile length.
The disadvantage is that the tested pile needs to be pre-buried with acoustic measuring tubes, which increases the cost of the pile foundation. At the same time, the cost of the acoustic wave penetration test is lower and the strain detection method is higher.