Sonic Logging Tube is a key tool used in civil engineering to detect the integrity of pile foundations. Its function is similar to that of a "stethoscope" in medicine. It uses ultrasonic technology to detect cracks, cavities, segregation and other defects in the pile body through a pipe pre-buried inside the concrete pile foundation, thereby evaluating the bearing capacity and construction quality of the pile foundation.

Structure and material of sonic detection tube

    Sonic detection tubes generally have smooth inner walls to reduce the resistance of the ultrasonic probe when moving in the tube and ensure that the sound waves can be smoothly transmitted in the tube. The connection parts of the tube body adopt a special sealing design to prevent slurry from penetrating into the tube and affecting the test results. Common connection methods include welding, threaded connection, sleeve, socket connection, etc.

Purpose of sonic detection tube

    Pile foundation quality detection: This is the main purpose of sonic detection tubes. Ultrasonic detection through sonic detection tubes can accurately determine whether there are defects in the pile body concrete, such as cavities, cracks, mud inclusions, segregation, etc. In bridge construction, using sonic detection tubes to detect pile foundation quality can timely discover potential problems and ensure the normal operation and service life of bridges.

‌    Underground continuous wall detection‌: In underground space development, the sonic detection tube is used to detect the concrete quality of the underground continuous wall to ensure its ability to withstand soil and groundwater pressure‌.

‌    Water conservancy project detection‌: In water conservancy dams, sluice gates and other projects, the sonic detection tube helps detect the quality of concrete, find defects in time, and ensure the safety of the project‌.

Detection principle of sonic detection tube

    The detection principle of sonic detection tube is to use the difference in the propagation characteristics of ultrasonic waves in different media to judge the quality of pile foundation. During the detection, the ultrasonic transducer emits ultrasonic waves in the sonic detection tube, and the ultrasonic waves pass through the wall of the sonic detection tube into the pile body concrete. If the quality of the pile body concrete is uniform and there are no defects, the ultrasonic propagation speed is stable, and the received signal strength and frequency and other parameters are also within the normal range; if there are defects, such as cracks, the propagation path and speed of the ultrasonic wave will change, and the received signal will also change accordingly. By analyzing these changes, the inspectors can judge the quality and defects of the pile body concrete.