Dapeng Town Industrial Park, Tongshan District, Xuzhou City, Jiangsu Province, China
Threaded hole processing accuracy problem
The threaded hole of the bolt ball node is a key component, and its processing accuracy is crucial. In actual processing, problems such as position deviation and uneven pitch of the threaded hole often occur. For example, when the position deviation of the threaded hole is too large, the connection between the bolt and the ball node will not be tight, and the load cannot be effectively transferred, which will reduce the stress performance of the structure.
Uneven pitch will affect the screw-in and tightening process of the bolt, resulting in insufficient bolt preload. This may cause the node to loosen in the long-span grid structure and affect the stability of the entire structure.
Problems with the connection between the bolt ball and the rod
The connection between the bolt ball and the rod is usually bolted. In actual use, the length, diameter and tightening degree of the bolt may affect the quality of the connection. If the bolt length is insufficient, the connection between the bolt and the ball node will be loose, and it is easy to fall off when subjected to external force.
Too large or too small bolt tightening torque will also affect the reliability of the connection. Too much tightening torque may cause the bolts to deform or even break, while too little tightening torque cannot ensure the preload of the bolts, resulting in loose nodes.
Rod deformation
In large-span steel grid structures, rods may deform for various reasons. For example, during transportation, the rods are hit or squeezed, which may cause local deformation of the rods. During installation, due to improper construction, the rods may also be deformed by excessive external forces.
Rod deformation will affect the overall force performance of the structure and reduce the bearing capacity of the rods. If the deformation is too large, it may also cause problems in the connection between the rods, affecting the stability of the structure.
Rod corrosion
-Steel grid structures are usually exposed to the natural environment, and the rods are prone to corrosion. Especially in humid, acidic and other environments, the corrosion of the rods is more serious. Corrosion will cause rust on the surface of the rods, reducing the strength and durability of the rods.
Rod corrosion will also affect the appearance and service life of the rods. In severe cases, it may cause the rods to break, endangering the safety of the entire structure.
Overall structural deformation
Long-span bolt-ball steel grid structures may deform as a whole during long-term use. This may be caused by factors such as unreasonable structural design, poor construction quality, or external loads. For example, when the structure is subjected to large wind loads or earthquakes, the structure may deform.
Overall structural deformation will affect the normal use of the structure and reduce the bearing capacity of the structure. At the same time, deformation may also cause uneven stress distribution inside the structure, further aggravating structural damage.
Loose structural connection
Loose connection of bolt-ball nodes is one of the common defects of long-span steel grid structures. Due to the complex connection method of bolt-ball nodes, the bolts may gradually loosen during long-term use. This will lead to loose connections between nodes, affecting the integrity and stability of the structure.
Loose structural connections may also lead to increased vibration of the structure, and in extreme cases, may even cause structural collapse.
