在、高层建筑、地下车库及消防控制室等人员密集或关键设施中，电缆线路的直接关系到火灾发生时人员的疏散与救援。防火桥架作为桥架家族中的特殊成员，承担着守护生命通道的重任。

In densely populated or critical facilities such as shopping malls, high-rise buildings, underground garages, and fire control rooms, the safety of cable lines is directly related to the evacuation and rescue of personnel in the event of a fire. As a special member of the bridge family, fire-resistant cable trays bear the responsibility of guarding the passage of life.

防火桥架并非一种独立的结构形态，而是在普通槽式、托盘式或梯式桥架的基础上，通过特殊的工艺赋予了其耐火性能。其原理是在桥架表面喷涂一层厚厚的防火涂料，或者在内外层填充非金属防火材料。当遭遇火灾时，这层防火涂层会膨胀发泡，形成一层致密的隔热碳化层，有效阻隔火势蔓延和高温对内部电缆的炙烤。

Fireproof bridge is not an independent structural form, but is based on ordinary trough, tray or ladder bridge, and is endowed with fire resistance performance through special processes. The principle is to spray a thick layer of fireproof coating on the surface of the bridge, or fill non-metallic fireproof materials on the inner and outer layers. When encountering a fire, this fireproof coating will expand and foam, forming a dense insulation carbonization layer, effectively blocking the spread of fire and the high temperature from roasting the internal cables.

根据相关规范，防火桥架的耐火时间有着严格的要求，例如在地下车库中通常要求耐火极限大于1小时。它主要应用于消防水泵、防排烟风机、消防电梯以及火灾自动报警系统等关键配电线路中。在选型和安装时，不仅要关注桥架本身的耐火等级，还必须严格遵守规范：当桥架穿越防火墙、楼板时，必须采用不低于楼板耐火极限的不燃材料进行严密的防火封堵，确保在极端情况下，这条“防线”依然能够坚不可摧。

According to relevant national regulations, there are strict requirements for the fire resistance time of fire-resistant cable trays. For example, in underground garages, the fire resistance limit is usually required to be greater than 1 hour. It is mainly used in key distribution lines such as fire pumps, smoke exhaust fans, fire elevators, and automatic fire alarm systems. When selecting and installing, not only should attention be paid to the fire resistance rating of the bridge itself, but also strict adherence to regulations: when the bridge passes through firewalls and floor slabs, non combustible materials not lower than the fire resistance limit of the floor slab must be used for tight fire sealing to ensure that this "safety line of defense" can still be unbreakable in extreme situations.

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