Difference between high strength large hexagon head bolts and twisted shear high strength bolts
Difference between high strength large hexagon head bolts and twisted shear high strength bolts
Friction type high-strength bolts (large hexagon) and torsion shear type high-strength bolts in the structure, construction and application of obvious differences, as follows:
1. Different construction design
- Friction type high strength bolts:
The main body of the bolt is an ordinary screw steel structure, the head has various shapes (such as large hexagonal head), no special tail steel structure, need to be used with nuts and washers.
Different construction tightening methods
- Friction type high strength bolts:
- Tightening needs to be divided into initial screwing and final screwing, and some large nodes need to be re-tightened.
- Final tightening by torque method (torque spanner to control the torque value) or corner method (control the bolt rotation angle) to ensure that the preload, the need to strictly calibrate the torque spanner, the construction process needs to measure the torque.
Preload control accuracy is different
- Friction type high strength bolts:
Preloading force is indirectly controlled by torque, which is affected by thread friction coefficient, washer friction and other factors, with relatively low precision, and requires regular calibration of torque spanners.
Different quality testing methods
- Friction type high strength bolts:
- Within 1~48 hours after the final screwing, use torque spanner to carry out ‘torque check’, and randomly check whether the preload of bolts meets the standard (±10% error allowed).
- It is necessary to check the exposed situation of the bolt wire buckle (2~3 buckles, allowing 10% of the bolt exposed 1 or 4 buckles).
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