防火電纜橋架之所以具備防火性能，關(guān)鍵在于使用了特殊的防火材料。橋架主體通常采用的冷軋鋼板或不銹鋼板，這些金屬材質(zhì)本身具有一定的耐高溫和不燃特性，為防火提供了基礎(chǔ)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.

　　在此基礎(chǔ)上，橋架表面會(huì)進(jìn)行特殊的防火涂層處理。常見(jiàn)的防火涂層為膨脹型防火涂料，這種涂料在常溫下與普通涂料無(wú)異，具有良好的裝飾性和防腐性。

　　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，當(dāng)遭遇火災(zāi)，溫度升高到一定程度（一般為 100℃ - 200℃）時(shí)，涂層會(huì)發(fā)生化學(xué)變化，迅速膨脹形成一層厚厚的海綿狀炭質(zhì)泡沫層。該泡沫層的導(dǎo)熱系數(shù)極低，能有效隔絕熱量傳遞，將電纜與高溫火焰隔離開(kāi)來(lái)，延緩電纜因高溫導(dǎo)致的絕緣層老化、熔化等問(wèn)題，從而保證電纜在一定時(shí)間內(nèi)正常運(yùn)行，為人員疏散和火災(zāi)撲救爭(zhēng)取寶貴時(shí)間 。

　　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.

　　除了膨脹型防火涂料，還有一些橋架會(huì)采用非膨脹型防火涂料。此類(lèi)涂料主要依靠自身的難燃性、低導(dǎo)熱性以及對(duì)金屬的保護(hù)作用來(lái)實(shí)現(xiàn)防火。它在高溫下會(huì)形成一層致密的陶瓷狀硬殼，阻止火焰和熱量對(duì)橋架及內(nèi)部電纜的侵襲，同時(shí)抑制金屬在高溫下的氧化反應(yīng)，增強(qiáng)橋架的結(jié)構(gòu)穩(wěn)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.

　　防火電纜橋架的結(jié)構(gòu)設(shè)計(jì)也是其實(shí)現(xiàn)防火功能的重要因素。許多防火電纜橋架采用雙層或多層結(jié)構(gòu)設(shè)計(jì)，層與層之間形成空氣隔熱層。空氣是熱的不良導(dǎo)體，能夠有效阻擋熱量的傳導(dǎo)，如同給橋架內(nèi)部的電纜穿上了一層 “隔熱衣”。

　　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.

　　當(dāng)外界發(fā)生火災(zāi)時(shí)，這層空氣隔熱層可以顯著降低熱量傳遞到電纜的速度，使電纜在高溫環(huán)境下保持相對(duì)較低的溫度，延長(zhǎng)電纜的正常工作時(shí)間。

　　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，橋架的連接處和接縫部位也經(jīng)過(guò)特殊處理。這些部位通常會(huì)采用防火密封膠條或防火堵料進(jìn)行密封，確保橋架整體形成一個(gè)相對(duì)封閉的空間。這樣一來(lái)，不僅可以防止火焰和高溫氣體進(jìn)入橋架內(nèi)部，還能避免電纜燃燒產(chǎn)生的有毒煙霧和火焰通過(guò)縫隙蔓延到其他區(qū)域，有效阻止火災(zāi)的擴(kuò)散，保障整個(gè)電力系統(tǒng)及周邊環(huán)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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