1. A practical method is to use thick, long rebar to poke through the mud blocking the sound testing pipe, which is direct, quick, and effective. However, this method has its drawbacks, as it cannot guarantee that the mud is completely cleared, and the sound testing pipe that needs to be cleared must be a steel pipe with a larger outer diameter.

2. The drilling machine is equipped with a small drill bit for scanning holes. This method ensures targeted and thorough疏通 without missing any spot, though it does slightly consume more labor time. But it's worth the insurance.

3. Use a high-pressure water jet directly for internal pipeline cleaning. Generally, sludge only adheres to the inner wall and cannot withstand the impact of the high-pressure water jet. A high-pressure flush for 3 to 5 seconds at the clog can clear it. However, always pay attention to the position and angle of the flush to prevent the sludge and mud from flowing back.

The deformation of the acoustic tube causes great difficulty in the detection process, even making it impossible to conduct the inspection. Therefore, if the acoustic tube is found to be blocked before the foundation pile is灌浆 and before the detection, effective measures should be taken to unblock the tube to ensure the smooth progress of the ultrasonic detection. There are generally three methods to unblock the tube: using thick, long steel bars to poke through the acoustic tube; using high-pressure water to flush and clean the tube; and using a drilling machine with a small drill bit to scan the hole.