Abstract: The integrity of piles is paramount important to the safety of building structures. The ultrasonic transmission method, a well-established technique for assessing pile integrity, involves the use of embedded ultrasonic testing tubes to detect the pile shaft’s condition with a high precision and without causing damage. However, this method’s accuracy is heavily dependent on the quality of the ultrasonic testing tube installation, an aspect that is often overlooked during the construction, potentially compromising the accuracy of the pile integrity assessment. This paper analyzes issues that may affect the ultrasonic transmission method’s effectiveness in pile integrity testing during the design and construction phases. It scrutinizes the verification process of the construction and testing pile lengths at the testing site, identifying reasons for errors or deviations in the installation position of ultrasonic testing tubes during the design and construction. These inaccuracies can significantly impact the reliability of the testing results. By presenting the real-world engineering case studies, the paper highlights the importance of pile length verification during on-site pile testing. It recommends that when discrepancies are found, such as when the tested pile length is shorter than the constructed length, alternative testing methods should be employed for the validation to ensure the scientific rigor and accuracy of the testing process. In conclusion, the paper underscores the necessity for meticulous attention to the installation and verification of ultrasonic testing pipes to ensure reliable pile integrity testing. It stresses the importance of adhering to strict quality control measures during construction to prevent errors that could lead to unreliable test outcomes, ultimately contributing to the overall safety and stability of building structures.

Key words: Ultrasonic Transmission Method, Pile Integrity Inspection, Pile Length Verification, Ultrasonic Measurement Tube