steel space frame type: bolt ball joint, positive quadrangular pyramid, grid.
1. steel space frametype: bolt ball joint, positive quadrangular pyramid, grid.
2. Support form: multi-point column support.
3. Grid area: projected area: 2790m*m;
4. Design service life: 100 years
5. The steel pipe material should conform to the Q235B steel specified in "Carbon Structural Steel" GB700 and the welded steel pipe specified by GB3092 or the No. 20 seamless steel pipe specified by GB3087.
6. The bolt ball is forged with No. 45 steel specified in GB699, and the surface should be smooth, no cracks, no overburning and no pitting.
7. The high-strength bolts are made of the materials specified in GB/T16939-1997 of "High-strength bolts for space frame joints bolts and ball joints". The finished product does not allow quenching cracks of any depth or length in any part. The performance grade of high-strength bolts must meet the requirements of "Steel High-strength bolts for grid bolts and ball joints "GB/T16939-1997", the surface hardness should reach HRC32~36, the thread should meet the 6g level in "General Thread Tolerance and Fit" GB197, and the surface should be blackened and painted. Anti-rust oil.
Post time: Mar-18-2022