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Impact-echo for investigation of grouting in tunnel lining
During shield tunnel construction and after the excavation, the surrounding ground must be mechanically supported. This is performed by 'rings' which consist of curved precast RC segments to secure the tunnel cross-section. Consecutively grouting is conducted to unify the concrete members and the ground as to control the volume. Only in the case of experimentally oriented, the grouting is investigated by core sampling, which is expensive, destructive and can be conducted in a limited number of points. In the case presented herein, impact-echo was applied as a means of non destructive evaluation. It provided reliable and time-effective results for a number of positions, far larger than that by core sampling. Excitation was conducted by a steel ball on the surface of the concrete ring and the reflection was acquired by a low frequency accelerometer. Combined use of time domain characteristics and spectral content reveals the filling condition of grout, suggesing that impact echo is valuable for quick and reliable assessment of grouting in shield tunnel construction.
Impact-echo for investigation of grouting in tunnel lining
During shield tunnel construction and after the excavation, the surrounding ground must be mechanically supported. This is performed by 'rings' which consist of curved precast RC segments to secure the tunnel cross-section. Consecutively grouting is conducted to unify the concrete members and the ground as to control the volume. Only in the case of experimentally oriented, the grouting is investigated by core sampling, which is expensive, destructive and can be conducted in a limited number of points. In the case presented herein, impact-echo was applied as a means of non destructive evaluation. It provided reliable and time-effective results for a number of positions, far larger than that by core sampling. Excitation was conducted by a steel ball on the surface of the concrete ring and the reflection was acquired by a low frequency accelerometer. Combined use of time domain characteristics and spectral content reveals the filling condition of grout, suggesing that impact echo is valuable for quick and reliable assessment of grouting in shield tunnel construction.
Impact-echo for investigation of grouting in tunnel lining
Schlagecho zur Untersuchung von Mörtelfüllungen in Tunnelausbauten
Shiotani, Tomoki (author) / Aggelis, Dimitrios G. (author) / Kasai, Kazuhiro (author)
2008
10 Seiten, 9 Bilder, 1 Tabelle, 12 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
Evaluation of grouting in tunnel lining using impact-echo
| British Library Online Contents | 2008
Evaluation of grouting in tunnel lining using impact-echo
| Online Contents | 2008
Evaluation of grouting in tunnel lining using impact-echo
| Online Contents | 2008
Grouting tunnel lining on aqueduct
Engineering Index Backfile | 1942