Introduce the use of anchor testing equipment.
An electric spark emission sensor (which has frequency bandwidth, short aftershocks, good repeatability, and controllable energy) is located in the probe of the anchor rod fullness instrument, which can send to the anchor rod at a frequency twice as wide as that of the super magnetic transducer P-wave and S-wave. These waves travel along the bolt, and the speed depends on the grouting around or at the end of the bolt (where it is reflected back to the probe).
At this time, the probe acts as a receiver to detect the reflected wave, and the computer analyzes the reflected wave. By processing and analyzing the signal, the instrument determines the length of the bolt and the overall condition of the rock and grout. These measurements are displayed on the instrument panel.
Completely display the test results on the display, mark the length of the anchor rod, numerically quantify the fullness, and mark the defect location.