Steel Structure Solution: Bolts

Steel Structure Solution: Bolts

Galvanized bolt

Function: A type of fastener consisting of head and screw (cylinder with external thread), which needs to be matched with nut for fastening and connecting two parts with through holes.

Application: It is applied to the connection of steel structure fasteners such as domestic and foreign building structures, bridges, large hoisting machinery, etc.

 

 

 

Turnbuckle

Uses the screw rod to expand and contract, which can adjust the tightness of the steel wire rope. The components can be bundled during component transportation and loosened during installation and correction. It consists of an adjusting rod with left and right screw threads, a nut and a pull rod, and the adjusting rod is also fixed with an anti-theft anti-loosening device which is formed by connecting a cover plate, a fixing plate and a guide plate into a whole through anti-theft anti-loosening bolts.

When in use, a special matching sleeve must be used to unscrew the anti-theft anti-loosening bolt, which has good anti-theft effect and is safe and reliable. After the anti-theft and anti-loosening device is dismounted, the anti-theft and anti-loosening device does not need to be dismounted, and the ring guide plate on the anti-theft and anti-loosening device slides along the pull rod and can be adjusted and operated by moving a distance, so that the anti-theft and anti-loosening device is convenient to use. The Turnbuckle is a steel casting.

During design and calculation, only the corresponding pull rod can be calculated, but the specification of the flower basket should be one level higher than that of the pull rod. The following are the specifications of the pull rod and the corresponding flower basket commonly used in steel structure design:

Pull rod basket

　　Φ２０　Ｍ２２

　　Φ２４　Ｍ２７　

　　Φ２８　Ｍ３０

Φ３０　Ｍ３２

 

If tie rods of other specifications are used, the flower basket can be fixed. Various specifications of ordinary or high-strength flower blue bolts, flower basket bolts, open-body flower blue, open-body flower basket are made of Q235B, 45 # steel, 40Cr, 35CrMoA, Q345D flower blue bolts, flower basket bolts, open-body flower blue, open-body flower basket, etc. Surface treatment adopts: electroplated white zinc, blue white zinc, multicolored zinc, blackening and natural color five surface treatment methods are available; The product grades are: 4.8, 8.8, 10.9 and 12.9.

 

Shear studs

scientific name stud and welding stud

Stud Usage: Suitable for steel beam surface and penetration welding of steel beam and steel bearing plate.

Basic specifications of pegs: 13, ￠16, ￠19, ￠22, ￠25. And special specifications.

Common accessories for pegs: porcelain ring (the specification of porcelain ring is a matching accessory with pegs. )

Application: Suitable for steel beam surface and penetration welding of steel beam and steel bearing plate.

 

Expansion bolt

Function: The fixing of the expansion screw is to use the taper to promote expansion and generate friction and binding force to achieve the fixing effect. Type and specification of expansion bolts. The grades of expansion bolts are divided into 45, 50, 60, 70 and 80. The materials are mainly austenite A1, A2 and A4, martensite and ferrite C1, C2 and C4. Its representation method is, for example, A2-70. Before and after "-",the bolt materials and strength grades are respectively indicated. The following is the complete specification table of expansion bolts. Common materials of bolt materials: Q215, Q235, 25 and 45 steel. For important or special threaded joints, alloy steel with higher mechanical properties such as 15Cr, 20Cr, 40Cr, 15MnVB and 30CrMrSi can be selected.