The surface of cable bridge is often brushed with fire retardant paint to achieve the purpose of fire prevention, but from the engineering practice of Shandong Cable Bridge Company, this method is unreliable!

1、防火涂料的厚度

1. Thickness of Fireproof Coatings

電纜橋架刷防火涂料，可參考《鋼結構防火涂料應用技術規(guī)范》CECS 24:90，借鑒鋼結構的一些經驗。防火涂料的厚度與耐火極限有密切的關系，詳見表1。問題來了，表1是對鋼結構來說沒有問題，涂層厚度與鋼結構尺寸相比微乎其微，而電纜橋架所用材料只有幾個毫米厚，表中厚涂型涂層厚度高可達50mm（對應耐火極限3h），這么厚的涂層如何刷到薄薄的電纜橋架上。

Brushing fire-retardant coatings for cable bridge can refer to CECS 24:90 of "Technical Specification for Application of Fire-retardant Coatings for Steel Structures" and draw on some experience of steel structures. The thickness of fire retardant coatings is closely related to the fire resistance limit, as shown in Table 1. The problem arises. Table 1 is no problem for steel structure. The thickness of coating is very small compared with the size of steel structure. The material used for cable bridge is only a few millimeters thick. The thickness of medium-thick coating can reach up to 50 mm (corresponding to the fire resistance limit of 3 hours). How can such a thick coating be brushed onto thin cable bridge?

2、現場施工的漏洞

2. loopholes in site construction

刷防火涂料需要工地現場施工，涂料是否刷的均勻關系防火的效果，這與工人的技術水平、責任心等有關。另外，橋架一般先安裝，安裝后靠近墻角、梁柱、其他管線、及吊桿處容易出現死角，不容易刷好涂料。

Brushing fire-retardant coatings requires site construction. The uniformity of paint brushing is related to the fire-retardant effect, which is related to the technical level and responsibility of workers. In addition, the bridge is generally installed first, after installation, near the corner of the wall, beam and column, other pipelines, and suspenders are prone to dead angle, it is not easy to brush paint.

刷完涂料的橋架，在敷設電纜或安裝其他管道時容易將涂層破壞，失去防火作用，影響防護效果。

When the coated bridge is finished, it is easy to damage the coatings when laying cables or installing other pipelines, thus losing the fire protection effect and affecting the protection effect.

3、無法檢測防火性能

3. Failure to detect fire protection performance

由于上述原因，工地刷的防火涂料無法檢測其防火性能，不像成品的產品在出廠時有檢驗、檢測，也有機構的檢測。

Because of the above reasons, the fire-proof coatings of site brushes can not detect their fire-proof performance, unlike finished products, which are inspected and tested when they are out of the factory, there are also inspections by state authorities.

綜上所述，電纜橋架現場刷防火涂層，其防火效果難以保證，需慎重使用！

To sum up, it is difficult to ensure the fire-proof effect of brushing fire-proof coating on the site of cable bridge, so it needs to be used cautiously.

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Above is the wonderful content provided to us by the small edition of Shandong Cable Bridge Company. You can collect our website: http://sznewtr.com! To learn more about the industry frontier information, thank you for your support!