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What are high-strength bolts, the characteristics of high-strength bolts and their transportation requirements

High-strength bolts (referred to as high-strength bolts) refer to bolts made of high-strength steel or that need to be prestressed. They are one of the main connection methods of bridge steel structures. High-strength bolts are mostly used for the connection of bridges, rails, high-pressure and ultra-high-pressure equipment. High-strength bolts used in ultra-high-pressure equipment need to be prestressed to ensure the sealing of containers. In recent years, due to the influence of many factors such as the use environment, some bridges have experienced high bolt delay fracture and fall off. The fracture of such bolts is mostly brittle fracture, which may lead to slippage of the connecting nodes, instability and damage of the main structure of the steel bridge, and risk of hitting vehicles and pedestrians. Different from ordinary bolts, high-strength bolts are fasteners with strong fastening ability, and the requirements for storage, transportation and storage are relatively high. According to its fastening principle, it is required that every link of high-strength bolt connections from factory to installation must be maintained in the factory state, that is, the torque coefficient and standard deviation of the same batch of large hexagon head high-strength bolt connections remain unchanged. Keep the axial force and standard deviation of the torsional shear type high-strength bolt connection pair unchanged. It should be said that for the large hexagonal head bolt connection pair, if the state changes, it can be remedied by adjusting the construction torque, but the torsional shear type high-strength bolt connection pair has no chance of remediation, and can only be solved by the torque method or the angle method.

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