24小时。根据相关资料查询显示：高强度螺栓连接副的初拧复拧终拧应在24小时内完成。高强度螺栓是用高强度钢制造的，或者需要施以较大预紧力的螺栓，皆可称为高强度螺栓。高强度螺栓多用于桥梁、钢轨、高压及超高压设备的连接。这种螺栓的断裂多为脆性断裂。应用于超高压设备上的高强度螺栓，为了保证容器的密封，需要施以较大的预应力。
24 hours. According to the query of relevant data, the initial and final tightening of high-strength bolt connection pairs should be completed within 24 hours. High-strength bolts are made of high-strength steel, or bolts that require a large preload, which can be called high-strength bolts. High-strength bolts are mostly used for the connection of bridges, rails, high-voltage and ultra-high-voltage equipment. The fracture of this bolt is mostly brittle. In order to ensure the sealing of the container, the high-strength bolts applied to the ultra-high pressure equipment need to be prestressed.
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