1. When installing the acoustic detection pipe, the pile diameter is between 0.6-1.0 meters and two center points are arranged at three points and one line;
2. When installing the acoustic detection tube, the pile diameter is 1.0-2. Between 5 meters, three acoustic detection tubes are arranged in an equilateral triangle;
3. When the pile diameter of the acoustic detection tubes is greater than 2.5 meters, four acoustic detection tubes should be arranged. The location requires that the four acoustic detection tubes be connected in a square arrangement.

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