Bolted ball grid structure is a common form in modern construction engineering structure, and its quality requirements should not be underestimated. Therefore, the quality inspection of the bolted ball grid structure is also an important item to ensure the quality of the project. Today, I will introduce several important inspection items for the bolted ball grid structure.

The inspection items of the bolted ball grid structure can be divided into the installation during the production period and the inspection during the installation according to the situation. The following is a unified summary for everyone to introduce:

Mechanical properties (tensile, bending) impact of steel raw materials
Welding procedure qualification (tension, bending, impact, X-ray photography)
Tensile strength test of grid unit
High-strength bolt tensile test
Anchor pull (on-site)
Radiographic inspection of welds or raw materials
Ultrasonic thickness measurement of steel
Non-destructive testing of welding balls and welds
Welding ball wall thickness detection
On-site installation weld inspection of spheres and rods
Bolt ball inspection
Non-destructive testing of welds between rods and heads
High-strength bolts screwed into the sphere depth inspection (X-ray film)
Fireproof coating thickness measurement (if any)
In fact, most of them just do the tensile strength test of the lower grid unit.