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Acoustic Testing Tube(Nic Logging Pipe) is an indispensable acoustic detection pipe. By using the acoustic detection pipe, the quality of a pile can be assessed. The acoustic detection pipe serves as the pathway for the probe to enter the interior of the pile during the ultrasonic testing method for cast-in-place piles. It is a critical component of the ultrasonic testing system for cast-in-place piles, and its embedded method within the pile and its arrangement on the cross-section of the pile directly affect the testing results. Therefore, the layout and embedding method of the acoustic detection pipe should be marked on the design drawings, and the quality of embedding, pipe wall thickness should be strictly controlled during construction to ensure the smooth progress of the testing work.
1. A practical approach is to use thick, long rebar to knock through the mud blocking the sound wave tube, 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 wave tube that needs to be cleared must be a steel tube with a larger outer diameter.
2. Drilling machines equipped with small drill bits for hole sweeping ensure targeted and thorough cleaning without missing any spots. However, it does require a bit more 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 rinse for 3 to 5 seconds at the clogged area will clear the blockage. However, be sure to pay attention to the rinse position and angle to prevent the sludge from flowing back.
Deformed acoustic pipe blocking poses significant difficulties for detection work, sometimes even making it impossible to conduct inspections. Therefore, when acoustic pipe blockage is discovered before the foundation pile is poured and before detection, effective measures should be taken to clear the pipe to ensure the smooth progress of ultrasonic testing. Generally, there are three methods for clearing the pipe: using thick, long rebar to poke through the acoustic pipe; using high-pressure water to flush the pipe clean; and using a drilling machine with a small drill bit for cleaning the borehole.
