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The Needlework of a steel tailor: Engineering Safety Redundancy Design from the Selection of Screws

In steel structure buildings, the selection of each screw is related to overall safety. For instance, the seismic design of high-rise buildings typically employs 10.9 grade high-strength bolts in combination with anti-loosening washers to cope with the dynamic loads brought about by earthquakes. The hydraulic system of construction machinery relies on corrosion-resistant stainless steel screws to prevent failure caused by oil erosion. This article will, through practical cases, analyze how to achieve the safety redundancy design of engineering systems by means of the material, specification and installation process of screws.

Take a certain super high-rise building as an example. Its core tube structure adopts 12.9 grade alloy steel bolts, in combination with torque control wrenches, to ensure that the preload error of each bolt does not exceed ±5%. This precise control not only can resist the lateral force under the action of strong winds, but also can absorb energy through the elastic deformation of bolts during earthquakes. In addition, the connection points of hydraulic cylinders in construction machinery usually adopt stainless steel screws, with their surfaces treated by Dacromet, which can maintain stable performance under extreme temperatures ranging from -40℃ to 120℃. These detailed designs are precisely the micro manifestations of engineering safety redundancy.