基樁常在高樓建築或公共工程中使用，其品質檢測在現今以非破壞性檢測為主，本研究為提高分析結果的準確率，透過音波回音法加上複數連續小波轉換，並做實際的無樁帽及含樁帽現地試驗，比較其結果。無樁帽基樁為六根預鑄樁，其中一根基樁為完整基樁，其餘基樁分別含有不同缺陷，而含樁帽基樁則是在無樁帽基樁上重新灌混凝土製作樁帽。複數連續小波轉換分析時，則透過時頻分析的振幅頻譜和相位頻譜，來推估基樁波傳速度和缺陷位置。
結果顯示，基樁檢測使用音波回音法搭配複數連續小波轉換，在本試驗中能準確推估無樁帽基樁的波傳速度和缺陷位置，含樁帽基樁則比無樁帽基樁更複雜，但也能找出基樁波傳速度和大部份的缺陷。

Pile foundations are widely used in high-rise buildings and infrastructures, and non-destructive test (NDT) is currently the most popular integrity testing method. The purpose of this study is to increase the accuracy of testing results with sonic echo (SE) method and complex continuous wavelet transform. In-situ tests of piles, with and without pile caps, were perform to compare their results. Six pre-cast piles with different types of defects, except for one, were tested. Pile caps were then installed on top of the six piles. The amplitude spectrum and phase spectrum from time-frequency analysis were employee in the process of complex continuous wavelet transform analysis.

The result shows that, combining complex continuous wavelet transform with sonic echo method, the estimation of wave velocities and defect locations are fairly accurate for piles without pile cap. However, despite being more complicated, wave velocities and most of the defect locations can still be determined by this method in cases of piles with pile cap.

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