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Gap device is an electrical device which is meant to measure the gap between two structures. This is usually used in tunnels with welling potential which is lined by concrete lining. If the lining is attached to the rock, the swelling pressure might damage the structure so in these cases the concrete lining is detached from the rock surface by leaving a gap in between. To measure the actual location of the rock behind the lining, this gap device can be used. This consists of a base plate which is attached to the swelling rock and contains a LVDT which is contained in a seal steel cylinder. The body of the sensor is attached to the lining and the core to the rock therefore any rock movement due to swelling is measured and recorded as gap closure. The deice come in different range and accuracies but the most frequently used is a 70mm displacement range .
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Applications
Special Features
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A sample of calibration of Gap device is depicted in the following graph
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Required Information For Ordering
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In closure measurement between any two media