1) too thin steel binding, jumping binding, missing binding, especially the missing binding of the steel bar at the bottom of the beam.

2) There are often 1-2 encryption hoops at the joints between frame columns and beams, and some of them only have outer hoops without inner hoops.

3) No steel bars and additional steel bars are installed.

4) The protective pad is less or less unqualified, especially at the bottom of the beam.

5) The original steel bar is cut unevenly, and the number of effective threads of straight thread connection is insufficient.

6) When using "slimming reinforcement", the stretching rate of coiled reinforcement exceeds the specification requirements (the cold drawing rate of round steel should not be greater than 4%, and the cold drawing rate of ribbed reinforcement should not be greater than 1%).

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