충격반향기법 및 웨이블릿 변환을 이용한 도시철도 구간의 들뜸 및 이상개소 평가
Evaluation of lifting and Using Impact Echo Technique and Wavelet Transformation method at Urban Railroad
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초록
본 논문에서는 도시철도 콘크리트 슬래브 하부의 공동 및 이상개소를 탐지하기 위해 음향센서 기반의 충격반향기법을 이용한 시험을 실시하였다. 시험구간은 터널구간 2개소, 터널-박스 접속부구간 1개소, 박스구간 2개소로 총 5개소이며, 시험분석은 Short-Time Fourier Transform(STFT)을 사용하였다. 일부구간에서 들뜸 및 이상개소 판단되는 결과를 보였으며, 이상개소의 해당 깊이를 산정하여 시험의 유효성을 검증하였다. 음향센서를 이용한 충격방향기법은 기존의 가속도센서를 이용한 기법을 대체하여 콘크리트 궤도와 같이 종방향으로 긴 구조물의 전반적인 상태평가를 빠르고연속적이며 효과적으로 평가할 수 있을 것으로 판단된다.
Abstract
In this paper, an acoustic sensor-based impact reverberation technique was used to detect the cavities and abnormalities in the subbase of urban concrete slabs. The test section consisted of two tunnel sections, one tunnel-box connection section and two box sections. A total of five test sections were used for the short-time fourier transform(STFT). In some sections, the results were judged to be lifted and abnormal, and the validity of the test was verified by calculating the corresponding depth of the abnormal spot. The impact direction technique using the acoustic sensor can replace the existing acceleration sensor technique and can evaluate the overall condition evaluation of the longitudinally long structure like the concrete track quickly, continuously and effectively.
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