Multi-band sound wave detection device for pile diameter of vibro-replacement gravel pile

The invention provides a vibro-replacement gravel pile diameter multi-frequency-band sound wave detection device. The vibro-replacement gravel pile diameter multi-frequency-band sound wave detection device comprises a shell, a multi-frequency sound wave transducer, a micro servo motor, an orthogonal dipole sound wave transducer, a monopole sound wave transducer, a sound insulator and an array receiving transducer, wherein the multi-frequency sound wave transducer and the micro servo motor are mounted at the front end part of the shell; the micro servo motor drives the multi-frequency sound wave transducer to rotate in the annular direction, and sound waves with the frequency range of 0.1 kHz to 100 kHz are emitted to the vibro-replacement gravel pile; the orthogonal dipole acoustic wave transducer emits transverse waves and longitudinal waves which are perpendicular to each other and have the frequency lower than 1kHz to the vibro-replacement gravel pile; the monopole sound wave transducer emits sound waves w