防火电缆桥架之所以具备防火性能，关键在于使用了特殊的防火材料。桥架主体通常采用的冷轧钢板或不锈钢板，这些金属材质本身具有一定的耐高温和不燃特性，为防火提供了基础保障。

　　The key to the fire-resistant performance of fire-resistant cable trays lies in the use of special fire-resistant materials. The main body of the bridge is usually made of high-quality cold-rolled steel plates or stainless steel plates, which have certain high temperature resistance and non flammability characteristics, providing a basic guarantee for fire prevention.

　　在此基础上，桥架表面会进行特殊的防火涂层处理。常见的防火涂层为膨胀型防火涂料，这种涂料在常温下与普通涂料无异，具有良好的装饰性和防腐性。

　　On this basis, the surface of the bridge will be treated with a special fireproof coating. The common fireproof coating is the expansion type fireproof coating, which is no different from ordinary coatings at room temperature and has good decorative and anti-corrosion properties.

　　然而，当遭遇火灾，温度升高到一定程度（一般为 100℃ - 200℃）时，涂层会发生化学变化，迅速膨胀形成一层厚厚的海绵状炭质泡沫层。该泡沫层的导热系数极低，能有效隔绝热量传递，将电缆与高温火焰隔离开来，延缓电缆因高温导致的绝缘层老化、熔化等问题，从而保证电缆在一定时间内正常运行，为人员疏散和火灾扑救争取宝贵时间 。

　　However, when encountering a fire and the temperature rises to a certain extent (generally 100 ℃ -200 ℃), the coating will undergo chemical changes and rapidly expand to form a thick sponge like carbonaceous foam layer. The thermal conductivity of the foam layer is extremely low, which can effectively isolate the heat transfer, isolate the cable from the high temperature flame, and delay the aging and melting of the insulation layer caused by the high temperature of the cable, so as to ensure the normal operation of the cable within a certain period of time, and win valuable time for personnel evacuation and fire fighting.

　　除了膨胀型防火涂料，还有一些桥架会采用非膨胀型防火涂料。此类涂料主要依靠自身的难燃性、低导热性以及对金属的保护作用来实现防火。它在高温下会形成一层致密的陶瓷状硬壳，阻止火焰和热量对桥架及内部电缆的侵袭，同时抑制金属在高温下的氧化反应，增强桥架的结构稳定性。

　　In addition to expandable fireproof coatings, some bridge frames also use non expandable fireproof coatings. This type of coating mainly relies on its own flame retardancy, low thermal conductivity, and protective effect on metals to achieve fire prevention. It forms a dense ceramic like hard shell at high temperatures, preventing flames and heat from invading the bridge and internal cables, while suppressing metal oxidation reactions at high temperatures and enhancing the structural stability of the bridge.

　　防火电缆桥架的结构设计也是其实现防火功能的重要因素。许多防火电缆桥架采用双层或多层结构设计，层与层之间形成空气隔热层。空气是热的不良导体，能够有效阻挡热量的传导，如同给桥架内部的电缆穿上了一层 “隔热衣”。

　　The structural design of fire-resistant cable trays is also an important factor in achieving their fire-resistant function. Many fire-resistant cable trays adopt a double-layer or multi-layer structure design, forming an air insulation layer between layers. Air is a poor conductor of heat, which can effectively block the conduction of heat, just like putting a layer of "insulation" on the cables inside the bridge.

　　当外界发生火灾时，这层空气隔热层可以显著降低热量传递到电缆的速度，使电缆在高温环境下保持相对较低的温度，延长电缆的正常工作时间。

　　When a fire occurs outside, this air insulation layer can significantly reduce the speed of heat transfer to the cable, keeping the cable at a relatively low temperature in high temperature environments and extending the normal working time of the cable.

　　此外，桥架的连接处和接缝部位也经过特殊处理。这些部位通常会采用防火密封胶条或防火堵料进行密封，确保桥架整体形成一个相对封闭的空间。这样一来，不仅可以防止火焰和高温气体进入桥架内部，还能避免电缆燃烧产生的有毒烟雾和火焰通过缝隙蔓延到其他区域，有效阻止火灾的扩散，保障整个电力系统及周边环境的。

　　In addition, the connection and joint parts of the bridge frame have also undergone special treatment. These parts are usually sealed with fireproof sealing strips or fireproof blocking materials to ensure that the bridge as a whole forms a relatively enclosed space. In this way, not only can flames and high-temperature gases be prevented from entering the interior of the cable tray, but toxic smoke and flames generated by cable combustion can also be prevented from spreading to other areas through gaps, effectively preventing the spread of fires and ensuring the safety of the entire power system and surrounding environment.

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