16
L
OCATING
REINFORCEMENT
BARS
• The second scan locates the nearer (top) layer.
Figure 11. Scanning layers of bars of different size
(This situation is typical of a nearer layer consisting of relatively thin tie-wires or stirrups, and the
deeper layer consisting of much larger main structural bars.)
5.4 To determine the orientation of a reinforcement bar
1. Locate the position of the reinforcement bar - see “To locate a single layer of reinforcement
bars” on page 14.
2. Hold the search head over the bar. Move the search head side-to-side and rotate the head
clockwise/anti-clockwise until the signal is at a maximum (Figure 12).
When the signal is at its maximum, the search head is aligned parallel with the reinforcement
bar.
Figure 12. Determining orientation of a reinforcement bar
5.5 Practice
Because your Covermeter is unaffected by the nature of the material covering the reinforcing bars,
the easiest way to practice location and orientation technique is to use uncovered bars which you
331.book Page 16 Thursday, March 12, 2009 9:51 PM
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