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|Project||Localization of cavities in a medieval former water tunnel|
|Location||2012 - Mechelen, Belgium|
Cavities and leaks were found behind the brickworks in the medieval vault “Vlietenkelder” in Mechelen, Belgium during sanitation works. Their locations and extension, however, were unknown. Therefore, the effectiveness of sanitation with concrete injections could not be estimated.
TEXPLOR carried out geophysical investigations with ground penetration radar. The objective of the measurements was to detect and outline these cavities behind the tunnel facings of more than 2 m thickness. Two radar antennas were used, with 400 MHz and 1.5 GHz. More than 120 radar profiles were measured, with a total length of approx. 250 m. The distance of the profiles was 1 m each. The located cavities in two parts of the tunnel were displayed in the plans along with their exact length and depth. A targeted and therefore less expensive sanitation was then done afterwards. Meanwhile, the “Vlietenkelder” has been opened to the public as an exhibition room and new attraction in Mechelen.