高速铁路扣件在保证轨道稳定性、可靠性方面发挥着重要作用。对于有螺栓式扣件系统,锚固螺栓的可靠性很大程度上决定扣件系统功能的正常发挥。通过以沪宁城际铁路WJ-7B型弹性分开式扣件系统为例,总结扣件锚固螺栓松动的原因,分别从设计、施工和运营方面提出防松对策,进而提出相关的养护维修建议。 High-speed railway fasteners play an important role in ensuring orbital stability and reliability. For bolted fastener systems, the reliability of anchor bolts largely determines the proper functioning of the fastener system. Taking the WJ-7B flexible separate fastener system of Shanghai-Nanjing Intercity Railway as an example, the reasons for loosening of anchoring bolts of fastener are summarized, and the countermeasures for preventing loosening are put forward respectively from the aspects of design, construction and operation, and then the relevant maintenance and repair suggestions are put forward.