There is a special wrench that displays the torque and applies the torque to the necessary overtension value by measuring the relationship between the torque and bolt tension.Īngular method angular method is divided into two steps, one is the first twist, the second is the final twist.In simple terms, the early twist is generally workers use normal wrench is connected component fit closely to each other, and finally shake in early twist tiejin location as a starting point, according to the bolt diameter and thickness of the plate fold to determine the final twist Angle, rotate the nut, by powerful wrench screw to predetermined Angle value, the tensile strength of the bolt can meet the requirements of pretension value.In order to prevent high strength bolts from being affected by the external environment, the torque coefficient changes, so the general initial twist, final twist should be completed in the same day. The pretension of high strength steel bolts is achieved by tightening nuts.Pretension is usually controlled by the torque method, the rotation method, or the torsion of the bolt tail. The large hexagon head can only use the high-strength bolt of class 8.8 or above, and the torsional shear type high-strength bolt can only use the high-strength bolt of class 10.9. High strength bolts of steel structure can be divided into large hexagon head high strength bolts and torsional shear type high strength bolts due to different bolt structure and construction method.The big hexagon head type is the same as the common hexagon head coarse bolt, the torsional shear type bolt head is similar to the rivet head, but the torsional shear type thread end is set with a plum card head and an annular groove that can control the tightening torque, the difference needs to be paid attention to.Ī bolt joint consists of three parts: a bolt, a nut and a washer.The requirement of construction and arrangement of high strength bolt is the same as that of common bolt.Then it must be used in accordance with the specification. The high strength bolt of steel structure can be divided into two types: friction connection and pressure connection.The connection surface of the high-strength bolt bearing connection only needs to be rust-proof.However, high-strength bolt friction type has the advantages of close connection, good stress, fatigue resistance, suitable for bearing dynamic load, but the connection surface needs to do friction surface treatment, generally using sandblasting, sandblasting after coating inorganic zinc rich paint to deal with.
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