"Grid high-strength bolt" is a type of "steel structure bolts", which is only used in bolt ball grid and mesh shell structure, so it is different from the high-strength bolt we often say.
The special area is that there is a slide on the screw, and there is a part of the deep groove near the head, which is the area where the tightening screw (pin) in the matching "sleeve" (no grain nut) is placed, due to the placement of the pin, the installation, rotating the spanner, can push the bolt into the bolt ball, while the pin is rolling in the slide, when the bolt is screwed in place, tighten the screw just in the position of the deep groove. At this time tighten the screw to make it fall into the deep slot to achieve the effect of stopping and preventing loosening.
The characteristic level of the high-strength bolt of the grid is related to the diameter of the bolt, the small diameter is 10.9, the large diameter is 9.8, and the material is also related to the diameter The thread standard of high-strength bolts of the grid is from M12 to M64, which is actually visible: "High toughness bolts GB/T16939-1997 for the ball joints of steel grid bolts", of which the following M20 is used in the decorative grid structure.
Because there is a fixed internal connection in the structure of the node, the screw length of each specification of the high-strength bolt of the grid is also fixed, and the actual information can be referred to.
Because the high-strength bolt and sleeve of the grid are matched, the compression member of the joint design is based on the calculation of the sleeve pressure to determine the bolt specifications.