The position of the steel structure requires a spring cushion for mounting the bolt
High strength bolts (friction type) should be pre tension, and the spring washer is unfavorable to exert the pretension; the friction force produced by the high strength bolt in the preload moment is enough to prevent the looseness; therefore, no additional measures are needed to prevent loosening. Therefore, high strength bolts should not be equipped with spring washers.
Ordinary bolts: the bolts must be tightened so as to prevent the bolts from loosening. A spring washer prevents looseness between the connecting plate and the nut. When the nut is preloaded, the gasket is flattened to produce an elastic reaction force that forces the screw between the threads to increase friction and prevent looseness. However, due to uneven elasticity, the shock loading during operation results in poor looseness of the gasket. Generally used in less important connections.
Steel structure is mainly made of steel material, and it is one of the main types of building structure. The structure is mainly composed of steel beams and steel plates, such as steel beams, steel columns, steel trusses and so on. Each component or component is usually connected with welds, bolts or rivets. Because of its light weight and simple construction, it is widely used in large factories, stadiums, super high-rise and other fields. The characteristics of the steel is of high strength, light weight, good integral rigidity, deformation ability, it is used in the construction of large span and super high and super heavy buildings especially suitable; homogeneous and isotropic material, an ideal elastic body, the most consistent with the basic assumption of the general engineering mechanics; material has good plasticity and toughness that can have large deformation, can well withstand dynamic loads; short construction period; the high degree of industrialization, can carry out specialized production of high mechanization degree.
