Determining if embedded parts meet national standards involves three core steps: qualification verification, parameter checking, and sampling inspection. The specific methods are as follows:
Verifying Qualifications and Reports: Require the supplier to provide a third-party testing report for the corresponding batch of products, confirming that the standard number meets the requirements (embedded fasteners generally correspond to GB/T 799-2020, structural embedded parts correspond to JGJ 145-2013), and verifying that the report information is consistent with the product batch.
Checking Dimensional Parameter Deviations: Use calipers, total stations, and other tools for actual measurement. For conventional projects, dimensional deviations should be controlled within ±5mm, axis deviation less than 5mm, elevation error not exceeding 3mm, and adjacent spacing deviation not exceeding 2mm.
Key Performance Testing and Verification: For load-bearing embedded parts, focus on testing the anchorage bearing capacity through in-situ pull-out tests. Sampling and loading should be performed according to specifications to determine if the tensile and shear properties meet national standard design requirements. At the same time, the strength of the material and the integrity of the anti-corrosion coating are verified to ensure that there are no defects such as cracks or excessive rust.