1. The carbon steel grid project checks that the column foundation positioning axis, elevation, and anchor bolt specifications, dimensions, concrete strength, etc. meet the design requirements, and the review data is marked on the surface of the foundation.

2. When the top surface of the carbon steel grid foundation is directly used as the supporting surface of the column and the embedded steel plate or the support on the top surface of the foundation is used as the supporting surface of the column, the elevation error of the supporting surface should be ≤±3mm, and the levelness ≤L/1000; The center offset of the anchor bolt (anchor bolt) is ≤5mm, and the tolerance of the exposed length and wire length is 0～+20; the center offset of the reserved hole is ≤10mm.
3. When the cup mouth foundation is used, the cup mouth size should meet the design requirements, and the allowable error of the net frame is: the bottom elevation of the cup mouth is 0～-5mm; the depth of the cup mouth is ±5mm, and the verticality of the cup mouth is H/100 and not more than 10mm , Position deviation 10mm
4. When using a seat pad, the allowable error of the top surface of the pad is 0～-3.0mm; the levelness is ≤L/1000, the position is ≤20mm; the size and position of the pad are accurate, and the contact with the bottom surface of the column and the foundation is close and stable. , The welding is firm; the strength of the mortar should comply with the current national standards.