1. Bolt balls and materials needed to manufacture bolt ball joints. Its varieties, specifications, performance, etc. should meet the national product standards and design requirements.
Inspection method: Check the product's quality qualified documents, Chinese signs and inspection reports.
2. The bolt ball shall not have burning, cracks and folds.
Inspection method: Check a part of the bolt ball of each specification, observe with a 10x magnifying glass and inspect the surface.
3. The bolt ball thread size and thread tolerance should comply with the current national standards.
Inspection method: Check a part of the bolt ball of each specification and measure it with a standard thread gauge.
4. The size and allowable deviation of bolt ball diameter, roundness, and the angle between the center lines of two adjacent bolt holes should comply with the "Code for Acceptance of Construction Quality of Steel Structure Engineering".
Inspection method: Check a part of the bolt ball of each specification, and check whether it meets the specified value with a caliper and an indexing head instrument.
The above four are the detection methods of bolt balls for steel structure space frame. We can apply them to the actual inspection to improve the overall quality of the project.
