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高塔大跨径桥梁横跨在开阔的江面上,极易遭受雷击,严重威胁桥体及桥面上电气/电子设备和车辆行人的生命、财产安全。目前我国缺乏专门的高塔大跨径桥梁防雷技术规范,本文根据现代综合防雷理论,通过台州湾大桥的应用实例,在对大桥遭雷击的可能性和后果的严重程度进行分析的基础上,提出了大桥防雷类别;大桥的索塔、拉索、桥面等部位直击雷防护,以及等电位连接、引下线连接等具体措施;探讨了索面侧击雷防护的具体措施和外场设备雷击电磁脉冲及闪电电涌侵入的防护思路及方法。
The long-span high-rise bridge across the open river is extremely vulnerable to lightning strikes, seriously threatening the life and property safety of electrical / electronic equipment and pedestrians on bridges and bridges. At present, China lacks a special high-speed long-span bridge lightning protection technical specifications. Based on the theory of modern integrated lightning protection, through the application example of Taizhou Bay Bridge, based on the analysis of the possibility of lightning strike and the severity of the consequences , Put forward the lightning protection category of the bridge; concrete measures such as the lightning strike protection of pylon, cable and deck of the bridge as well as equipotential bonding and down-lead connection; discussed the concrete measures of lightning protection on the cable surface and the external equipment Lightning strike electromagnetic pulse and lightning surge intrusion prevention ideas and methods.