Comparative Study On Detection Mode Of Acoustic Transmission Method

Pile foundation is one of the most widely used basic forms in China,and its quality directly affects the safety of the entire building.Therefore,it is especially important to perform quality inspection on it.At present,there are various methods for quality inspection of pile foundations,and the acoustic wave transmission method is widely recognized by the engineering community because of its simple and quick operation and intuitive and reliable results.The thesis focuses on the comparison between the three detection modes of the acoustic transmission method,namely the flat measurement method,the oblique measurement method and the sector scanning method,and their comprehensive application.Firstly,the significance of the change of the three influencing factors of the measuring point spacing,the height difference of the receiving and transmitting transducers and the two positive transducers in the two acoustic tubes for the detection results is explored.Corrected the view that common sense is that the distance between the measuring points is less than half of the length of the transducer,and there is no value to the detection result.It is confirmed that when the size of the transducer is 20 cm,the detection result is 2.5cm.It is more meaningful than the distance between the measuring points of 5cm and 10 cm.Secondly,the flat test method,the oblique test method and the fan-shaped sweep test method are comprehensively compared,and the relationship between their detection accuracy and range is explored.It is concluded that the detection accuracy of the flat measurement method and the oblique measurement method is not always higher than the oblique measurement method when the measurement point spacing is changed,but there is a certain interval higher than a certain interval lower than a certain The relationship between the three equal intervals.Finally,the model piles are detected by using three detection modes: flat test,oblique test and fan-shaped sweep test.The horizontal cross-sectional diagram is drawn according to the test results,and the application value of the horizontal profile is explored.