What is the correct tightening method for steel structural high-strength bolts?
Two side with flat pad, and then the diagonal bolts first tight, in the clamping force on average, with a kilogram wrench tight. Just fine.The answer was good
Two side with flat pad, and then the diagonal bolts first tight, in the clamping force on average, with a kilogram wrench tight. Just fine.
In order to prevent the high strength bolt from being influenced by the external environment, the torque coefficient will be changed, so the general initial twist and final twist should be completed on the same day.The other is the torsional shear type high strength bolt, the main tool: electric torque wrenchA special electric wrench shall be used, such as where individual operations are difficult, or manual torque wrenches may be used. The final torque must be carried out according to the design requirements. Electric wrench, bolt tail clamping head after the final twist after that break
The construction of electric wrench, torque and torsional tuned design in the stalls after the application of measuring torque wrench repeatedly corrected electric wrench requirements are the same. The torque value is too high, will make the high strength bolts screw, bolt caused by super load operation, with a long time, the big six angle high-strength bolt crack problems. When the torque value is too low, the high strength bolt can not reach the predetermined fastening value, thus causing the friction coefficient of the steel structural joint surface to decrease and the carrying capacity decreasing.
One is the big six angle high-strength bolt: six angle high-strength bolt connection pair is composed of a bolt, a washer and a nut two group. Use torque wrench. Adjust torque wrench carefully according to construction technical requirement. The torque value of torque wrench should be within allowable deviation range. Construction of torque wrench, its error should be controlled within + 5%. Torque wrench for correction. The error should be controlled within + 3%.
