本研究對新建廠房所打設之基樁進行非破壞性檢測，首先在未打入前對預力樁進行波速量測得平均波速為4076 m/s，作為往後計算樁長之根據，接著進行單樁試驗，最後是含樁帽基樁試驗。試驗皆對基樁長度進行檢測，且與設計樁長比較後計算誤差，總計檢測6根樁。
本研究使用音波回音法搭配複數連續小波轉換做訊號處理來分析，比較兩種方法之可行性及可靠度。其中，音波回音法所檢測之誤差均小於6%，複數連續小波轉換所分析之誤差均小於5%。結果顯示使用小波轉換來分析可以得到較小之誤差，且利用複數連續小波轉換特有之相位角，讓我們可以在音波回音法幾乎無法使用的含樁帽基樁試驗中找到回波，因相位角可以突顯微小的訊號變化，更利於我們判斷樁底回彈訊號。

Non-destructive test (NDT) was used in this study to detect piles of the new building. First of all, tests were started at detecting the wave velocity of prestressed concrete (PC) piles before they were driven into soil. The average wave velocity was 4076 m/s, and it was used to calculate the pile length. Then several length tests were performed for single piles, and length tests were performed for group piles at last. Tests were performed to detect lengths of piles, and also compared with the designed length to calculate the error. Six piles were detected in this study totally.
The sonic echo (SE) method and complex continuous wavelet transform (CCWT) were used in this study to analyze, and compared the feasibility and the reliability between both methods. Errors of using the sonic echo method were under 6%, and errors of using CCWT were under 5%. The results showed that, using wavelet transform to analyze could get lower errors. If the phase angle of CCWT was used to find the echo, it would highlight slight changes of signals, and determined signals reflected from the bottom of the pile.

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