1. Beam + 10mm, -7mm board + 8mm.-5mm. The thickness of the protective layer of the longitudinally stressed steel bars of beam and slab members shall be checked and accepted separately and shall meet the following requirements.

2. When the pass rate of all rebar detector thickness inspection is 90% and above, it can be judged as qualified.

3. When the pass rate of the thickness inspection of all rebar testers is less than 90% but not less than 80%, the same number of components can be sampled for inspection; when the pass rate calculated by the sum of the two samplings is 90% and above, it is still Can be judged as qualified.

4. The maximum deviation of unqualified points in the results of each sampling inspection shall not be greater than 1.5 times the allowable deviation of the specifications.