工程中电缆桥架是电气安装常用的材质设施，以敷设线缆多、施工方便而优于管道，尤其在系统干线，集中布线的场合更加体现其优越性。桥架的形式有槽式、托盘式、梯架式等多种。桥架也有很多种材质和不同类型的工艺，比如材质分为：不锈钢、铝合金、玻璃钢等材质；工艺分为：热镀锌、静电喷塑、镀锌等工艺；另外按消防要求还有防火与耐火的桥架。每种材质和工艺的性能特点都是不同的，电缆桥架主要用途是用来支撑电缆、保护电缆以及管理电缆的，给我们的电缆线路管理带来了很大的方便。

　　Cable trays are commonly used materials and facilities for electrical installation in engineering. They are superior to pipelines in terms of laying more cables and convenient construction, especially in the case of system trunk lines and centralized wiring, which further demonstrates their superiority. There are various forms of cable trays, such as trough type, tray type, ladder type, etc. There are also many types of materials and techniques for bridge frames, such as stainless steel, aluminum alloy, fiberglass, and other materials; The process is divided into: hot-dip galvanizing, electrostatic spraying, galvanizing and other processes; In addition, according to fire safety requirements, there are fire-resistant and fire-resistant cable trays. The performance characteristics of each material and process are different. Cable trays are mainly used to support cables, protect cables, and manage cables, which brings great convenience to our cable line management.

　　一、镀锌桥架与热镀锌桥架（热浸锌桥架）区别

　　1、 Difference between galvanized bridge and hot-dip galvanized bridge (hot-dip galvanized bridge)

　　镀锌桥架：镀锌桥架又名电镀锌桥架；一般人理解为镀锌桥架以为是热镀锌桥架，其实是不对的，跟镀锌管一样，桥架的镀锌也分两种，即冷镀锌（电镀锌）和热镀锌（热浸镀锌）；

　　Galvanized bridge: Galvanized bridge, also known as electroplated galvanized bridge; The general understanding of galvanized cable trays as hot-dip galvanized cable trays is actually incorrect. Like galvanized pipes, there are two types of galvanizing for cable trays, namely cold galvanizing (electro galvanizing) and hot-dip galvanizing (hot-dip galvanizing);

　　钢铁在空气、水或土壤中很容易生锈，甚完全损坏。每年因腐蚀造成的钢铁损失约占整个钢铁产量的1/10，另一方面，为使钢铁制品与零件表面具有某种特殊功能，同时赋予其表面装饰性的外观，所以，一般采用电镀锌的方式对其处理。

　　Steel is prone to rusting and even complete damage in air, water, or soil. The annual steel loss caused by corrosion accounts for about 1/10 of the entire steel production. On the other hand, in order to give steel products and parts a special function on the surface and give them a decorative appearance, electroplating is generally used for treatment.

　　由于锌在干燥空气中不易变化，而在潮湿的空气中，表面能生成一种很致密的碱式碳酸锌薄膜，这种薄膜能有效保护内部不再受到腐蚀。并且当某种原因，使镀层发生破坏而露出不太大的钢基时，锌与钢基体形成微电池，使钢基体成为阴极而受到保护。

　　Due to the fact that zinc is not easily changed in dry air, while in humid air, a very dense basic zinc carbonate film can be formed on the surface, which can effectively protect the interior from corrosion. And when for some reason, the coating is damaged and a relatively small steel substrate is exposed, zinc forms a microbattery with the steel substrate, making the steel substrate a cathode and protected.

　　2、性能特点：

　　2. Performance characteristics:

　　1）锌镀层较厚，结晶细致、均匀且无孔隙，抗腐蚀性良好；2）电镀所得锌层较纯，在酸、碱等雾气中腐蚀较慢，能有效保护钢基体；3）锌镀层经铬酸钝化后形成白色、彩色、军绿色等，美观大方，具有一定的装饰性；4）由于锌镀层具有良好的延展性，因此可进行冷冲、轧制、折弯等各种成型而不损坏镀层。热镀锌桥架（热浸锌桥架）1、热浸锌说明：

　　1) The zinc coating is thick, with fine and uniform crystallization and no pores, and has good corrosion resistance; 2) The zinc layer obtained by electroplating is relatively pure and corrodes slowly in acid, alkali and other mist, which can effectively protect the steel substrate; 3) After chromic acid passivation, the zinc coating forms white, colored, military green, etc., which are aesthetically pleasing and have a certain degree of decorative value; 4) Due to its excellent ductility, zinc coating can be formed through various processes such as cold stamping, rolling, bending, etc. without damaging the coating. Hot dip galvanized bridge (hot-dip galvanized bridge) 1. Hot dip galvanizing instructions:

　　在各种保护钢基体的涂镀方法中，热浸锌是非常优良的一种。它是在锌呈液体的状态下，经过了相当复杂的物理、化学作用之后，在钢铁上不仅镀上较厚的纯锌层，而且还生成一种锌一铁合金层。这种镀法，不仅具备了电镀锌的耐腐蚀特点，而且由于具有锌铁合金层。还具有电镀锌所无法相比拟的强耐蚀性。因此这种镀法特别适用于各种强酸、碱雾气等强腐蚀环境中。

　　Among various coating methods for protecting steel substrates, hot-dip galvanizing is an excellent one. It is a process in which zinc is in a liquid state and undergoes complex physical and chemical reactions, resulting in the deposition of a thick layer of pure zinc on steel and the formation of a zinc iron alloy layer. This plating method not only has the corrosion resistance characteristics of electroplated zinc, but also has a zinc iron alloy layer. It also has strong corrosion resistance that cannot be compared to electroplated zinc. Therefore, this plating method is particularly suitable for various strong acid, alkali mist and other highly corrosive environments.

　　2、原理：热浸锌层是锌在高温液态下，分三个步骤形成的：

　　2. Principle: The hot-dip zinc layer is formed by zinc in a high-temperature liquid state in three steps:

　　1）铁基表面被锌液溶解形成锌—铁合金相层；

　　1) The iron-based surface is dissolved by zinc solution to form a zinc iron alloy phase layer;

　　2）合金层中的锌离子进一步向基体扩散形成锌铁互溶层；3）合金层表面包络着锌层。3、性能特点：

　　2) The zinc ions in the alloy layer further diffuse into the matrix to form a zinc iron miscible layer; 3) The surface of the alloy layer is enveloped by a zinc layer. 3. Performance characteristics:

　　（1） 具有较厚的致密的纯锌层覆盖在钢铁表面上，它可以避免钢铁基体与任何的腐蚀溶液的接触，保护钢基体免受腐蚀。在一般大气中，锌层表面形成一层很薄而密实的氧化锌层表面，它很难溶于水，故对钢基体起着一定保护作用。如果氧化锌与大气中其它成分生成不溶性锌盐后，则防蚀作用更理想。（2） 有铁—锌合金层，结合致密，在海洋性盐雾大气及工业性大气中表现特有抗腐蚀性；（3） 由于结合牢固，锌—铁互溶，具有很强的耐磨性；（4） 由于锌具有良好的延展性，其合金层与钢基附着牢固，因此热镀件可进行冷冲、轧制、拉丝、弯曲等各种成型而不损坏镀层；（5） 钢结构件热镀锌后，相当于一次退火处理，能有效改善钢基体的机械性能，钢件成型焊接时的应力，有利于对钢结构件进行车削加工。（6） 热镀锌后的配件表面光亮美观。（7） 纯锌层是热镀锌中富有塑性的一层镀锌层，其性质基本接近于纯锌，具有延展性，所以它富于挠性。二、喷塑桥架和镀锌桥架的区别

　　(1) A thick and dense pure zinc layer covers the surface of the steel, which can prevent the steel substrate from coming into contact with any corrosive solution and protect the steel substrate from corrosion. In the general atmosphere, a thin and dense layer of zinc oxide is formed on the surface of the zinc layer, which is difficult to dissolve in water and therefore plays a certain protective role on the steel substrate. If zinc oxide forms insoluble zinc salts with other components in the atmosphere, the anti-corrosion effect is more ideal. (2) There is an iron zinc alloy layer, which is dense and exhibits unique corrosion resistance in marine salt spray and industrial atmospheres; (3) Due to its strong bonding and zinc iron compatibility, it has strong wear resistance; (4) Due to the excellent ductility of zinc, its alloy layer adheres firmly to the steel substrate, allowing hot-dip plated parts to be formed through various processes such as cold stamping, rolling, drawing, and bending without damaging the coating; (5) After hot-dip galvanizing of steel structural components, it is equivalent to one annealing treatment, which can effectively improve the mechanical properties of the steel substrate, eliminate the stress during the forming and welding of steel components, and facilitate the turning processing of steel structural components. (6) The surface of the accessories after hot-dip galvanizing is bright and beautiful. (7) The pure zinc layer is the most plastic layer of hot-dip galvanizing, with properties similar to pure zinc and ductility, making it flexible. 2、 The difference between spray painted bridge and galvanized bridge

　　喷塑桥架跟镀锌桥架只是工艺上不一样，桥架的规格、型号、形状结构都是一模一样的。

　　Sprayed plastic cable tray is different from galvanized cable tray in technology, and the specification, model, shape and structure of cable tray are identical.

　　喷塑桥架和镀锌桥架工艺区别：镀锌桥架跟喷塑桥架都属于金属电缆桥架，镀锌桥架是用镀锌钢板制造而成，镀锌板相信不用过多解释，而喷塑桥架则是用镀锌桥架拿去加工喷塑一层静电喷涂层在表面上，所以叫喷塑桥架，简单理解就是喷塑桥架是镀锌桥架的升级版，防腐蚀性能更强。镀锌桥架

　　The difference between spray painted cable tray and galvanized cable tray technology: Firstly, galvanized cable tray and spray painted cable tray both belong to metal cable tray. Galvanized cable tray is made of galvanized steel plate, which I believe does not require too much explanation. On the other hand, spray painted cable tray is processed by spraying a layer of electrostatic spray coating on the surface of galvanized cable tray, so it is called spray painted cable tray. Simply put, spray painted cable tray is an upgraded version of galvanized cable tray with stronger anti-corrosion performance. galvanized cable tray

　　喷塑桥架和镀锌桥架的区别还有一点：就是上也不同，喷塑桥架既然是镀锌桥架的升级版，耐腐蚀性更强，当然也是不一样的，喷塑桥架比镀锌桥架贵。

　　The difference between spray painted bridge and galvanized bridge is also in terms of price. Since spray painted bridge is an upgraded version of galvanized bridge with stronger corrosion resistance, the price is also different. Spray painted bridge is more expensive than galvanized bridge.

　　喷塑式桥架

　　Spray painted bridge frame

　　三、不锈钢桥架与镀锌桥架有何区别

　　3、 What is the difference between stainless steel bridge and galvanized bridge

　　1、不锈钢桥架的介绍：

　　1. Introduction to Stainless Steel Bridge:

　　不锈钢桥架采用的是304不锈钢材质经过裁剪、折弯制作而成的一种桥架，具有非常耐腐蚀、耐冲击、不易锈蚀的特点。其中不锈钢桥架包括槽式桥架、托盘式桥架、梯级式桥架三种类型，不同类型的桥架可以让不锈钢材质的桥架满足不同地区的使用。所以不锈钢桥架是用来敷设安装重腐蚀、潮湿地区电缆线路的不错选择。

　　The stainless steel bridge is made of 304 stainless steel material that has been cut and bent, and has the characteristics of being very corrosion-resistant, impact resistant, and not easily corroded. Stainless steel cable trays include three types: trough type cable trays, tray type cable trays, and stepped type cable trays. Different types of cable trays can make stainless steel material cable trays meet the needs of different regions. So stainless steel cable trays are a good choice for laying and installing cable lines in heavily corroded and humid areas.

　　2、镀锌桥架的介绍：镀锌桥架采用的的冷轧钢板经过裁剪、折弯制作而成的一种桥架，具有很好的耐腐蚀、耐磨损性能。镀锌桥架表面的镀锌层更加增添了桥架的美观，使得安装敷设后整体效果更加美观。同时镀锌桥架也可以在室外进行安装敷设。

　　2. Introduction to Galvanized Bridge: Galvanized bridge is a type of bridge made by cutting and bending high-quality cold-rolled steel plates, which has excellent corrosion resistance and wear resistance. The galvanized layer on the surface of the galvanized bridge further enhances the aesthetics of the bridge, making the overall effect more beautiful after installation and laying. Galvanized cable trays can also be installed and laid outdoors.

　　镀锌电缆桥架的用途：1）由于镀锌电缆桥架具有不错的性能，可以在重腐蚀的环境中敷设安装。适应范围非常广泛，且非常的稳定。2）在很多工程建筑中也是需要使用到镀锌电缆桥架的，可以用镀锌电缆桥架来支撑和管理电缆线路，且起到不错的管理效果。3）在沿海、潮湿地区使用镀锌电缆桥架，可以很好地保护电缆线路不会被腐蚀、和侵蚀。

　　The purpose of galvanized cable tray: 1) Due to its good performance, galvanized cable tray can be laid and installed in heavily corrosive environments. The adaptability range is very wide, and it is very stable and safe. 2) Galvanized cable trays are also required in many construction projects. Galvanized cable trays can be used to support and manage cable lines, and have a good management effect. 3) The use of galvanized cable trays in coastal and humid areas can effectively protect cable lines from corrosion and erosion.

　　镀锌电缆桥架的优势：1）耐冲击：镀锌电缆桥架的硬度非常强，在遇到重压力和冲击都不容易出现变形和扭曲。2）费用低：镀锌电缆桥架的工艺处理费用要比其他工艺处理要低一些，且效果不会其他的工艺处理差。3）外观美：镀锌电缆桥架外表非常的光滑平整且明亮，整体呈现非常的美观。4）省工时：镀锌电缆桥架的工艺处理非常的方便简单，只需要将冷轧钢板浸泡入液态锌中即可，操作既简单又省力。

　　Advantages of galvanized cable trays: 1) Impact resistance: Galvanized cable trays have very strong hardness and are not easily deformed or twisted when subjected to heavy pressure and impact. 2) Low cost: The processing cost of galvanized cable trays is slightly lower than other processing methods, and the effect is not inferior to other processing methods. 3) Appearance beauty: The galvanized cable tray has a very smooth, flat and bright appearance, presenting a very beautiful overall appearance. 4) Time saving: The process treatment of galvanized cable trays is very convenient and simple. Simply immerse the cold-rolled steel plate in liquid zinc, making the operation simple and effortless.

　　如何选购镀锌电缆桥架通常我们购买产品的时候都会去仔细了解这个产品的性能特点，所以我们在选购电缆桥架的时候也不能操之过急，需要仔细的去了解各方面的问题，比如说电缆桥架的质量如何，我们就需要叫厂家提供电缆桥架质量的相关检测报告了。还有在合作的时候我们需要注意厂家是否信誉良好，因为诚信才是一个工厂的立足之本，才能使我们更好的合作。总而言之，我们在选购时尽量地去多了解了解相关的信息。

　　How to choose a galvanized cable tray? Usually, when we purchase a product, we carefully understand the performance characteristics of the product. Therefore, we cannot be too hasty when choosing a cable tray. We need to carefully understand all aspects, such as the quality of the cable tray. We need to ask the manufacturer to provide relevant inspection reports on the quality of the cable tray. We also need to pay attention to whether the manufacturer has a good reputation when cooperating, because integrity is the foundation of a factory and can enable us to cooperate better. In summary, we should try our best to learn more about relevant information when making a purchase.

　　3、不锈钢和镀锌桥架的区别：（1）材质不同：一种采用的材质是不锈钢、一种采用的材质是冷轧钢板。（2）不同：由于不锈钢材质的成本很高，所以不锈钢桥架的要比镀锌桥架的贵一些。不过不锈钢桥架的性能特点、使用寿命要比镀锌桥架好一些。（3）工艺不同：不锈钢桥架是直接采用不锈钢材质制作的，而镀锌桥架是采用冷轧钢板制作而成，然后还需要经过一层镀锌工艺处理。所以不锈钢桥架虽然比起镀锌桥架成本更高，但不容易生锈。

　　3. The difference between stainless steel and galvanized cable trays: (1) Different materials: one uses stainless steel and the other uses cold-rolled steel plate. (2) Price difference: Due to the high cost of stainless steel material, the price of stainless steel cable trays is slightly higher than that of galvanized cable trays. However, the performance characteristics and service life of stainless steel cable trays are better than those of galvanized cable trays. (3) Different processes: Stainless steel cable trays are directly made of stainless steel material, while galvanized cable trays are made of cold-rolled steel plates and then require a layer of galvanizing process treatment. So although stainless steel cable trays are more expensive than galvanized cable trays, they are less prone to rusting.

　　不锈钢表面处理为：酸洗后抛光，耐蚀性强，适用于室内室外。镀锌：也称为冷镀锌也叫电镀锌，是利用电解设备将工件经过除油、酸洗后放入成分为锌盐的溶液中，利用电解设备电流从正极向负极的定向移动，就会在工件上沉积一层锌。

　　The surface treatment of stainless steel is acid washed and polished, with strong corrosion resistance, suitable for indoor and outdoor use. Galvanizing, also known as cold galvanizing or electroplating, is the process of using electrolytic equipment to remove oil and acid from a workpiece, and then placing it in a solution composed of zinc salts. By directing the current of the electrolytic equipment from the positive electrode to the negative electrode, a layer of zinc is deposited on the workpiece.

　　大家知道，电缆桥架的表面防腐层类别主要有热浸锌、镀锌镍、冷镀锌、粉末静电喷涂等方式，生产厂家资料显示：热浸锌工艺寿命不小于40年，适用于室外重腐蚀环境，造价高；镀锌镍工艺寿命不小于30年，也适用于室外重腐蚀环境，造价高；冷镀锌工艺寿命不小于12年，适用于室外轻腐蚀环境，造价一般；粉末静电喷涂工艺寿命不小于12年，适用于室内常温干燥环境，一般。一般情况下，设计人员应该根据工程环境条件合理选择电缆桥架的表面防腐层类别，并在设计文件中清晰地表达。

　　As we all know, the types of surface anti-corrosion coatings for cable trays mainly include hot-dip galvanizing, zinc nickel plating, cold galvanizing, powder electrostatic spraying, etc. According to the manufacturer's information, the hot-dip galvanizing process has a service life of not less than 40 years and is suitable for outdoor heavy corrosion environments with high cost; The service life of galvanized nickel process is not less than 30 years, and it is also suitable for outdoor heavy corrosive environments with high cost; The service life of cold galvanizing process is not less than 12 years, suitable for outdoor light corrosion environment, and the cost is average; The service life of powder electrostatic spraying process is not less than 12 years, suitable for indoor room temperature and dry environment, and the price is average. In general, designers should reasonably select the type of surface anti-corrosion coating for cable trays based on the engineering environmental conditions, and clearly express it in the design documents.

　　4、不锈钢和镀锌桥架的相同之处：这两种桥架的性能特点都差不多相同，都是具有不错的耐腐蚀、耐老化、耐磨损性能，可以很好地保护电缆线路不受到伤害。但是由于不锈钢的成本过高，所以不锈钢桥架的采用率就没有镀锌桥架的高，很多用户选择的都是镀锌桥架。

　　4. The similarities between stainless steel and galvanized cable trays: Both types of cable trays have similar performance characteristics, including good corrosion resistance, aging resistance, and wear resistance, which can effectively protect cable lines from damage. However, due to the high cost of stainless steel, the adoption rate of stainless steel cable trays is not as high as that of galvanized cable trays, and many users choose galvanized cable trays.

　　四、防火桥架与镀锌桥架有何区别

　　4、 What is the difference between fire-resistant bridge and galvanized bridge

　　主要是防火桥架与镀锌桥架两者用途不同。1、防火桥架适用于10KV以下电力电缆，以及控制电缆、照明配线等室内室外架空电缆沟、隧道的敷设。

　　The main difference is that fire-resistant cable trays and galvanized cable trays have different purposes. 1. Fireproof cable trays are suitable for laying indoor and outdoor overhead cable trenches and tunnels for power cables below 10KV, as well as control cables, lighting wiring, etc.

　　防火桥架主要由玻璃纤维增强材料、无机黏合剂复合的防火板，与金属骨架复合以及其他的防火基材组成，外层加防火涂料。防火桥架遇火后不会燃烧，从而阻隔火势蔓延。防火桥架具有极其良好的防火阻火效果，又具有耐火、耐油、耐腐蚀、、无污染，整体安装方便等特点。防火涂料有涂层薄、耐火极限高、粘接力强的特点。五、防火桥架和耐火桥架有什么区别

　　The fire-resistant bridge is mainly composed of fire-resistant boards reinforced with glass fiber and inorganic adhesives, composite with metal skeleton, and other fire-resistant substrates, with fire-resistant coating added on the outer layer. Fireproof cable trays will not burn when exposed to fire, thus blocking the spread of fire. Fireproof bridge has extremely good fire prevention and extinguishing effects, as well as characteristics such as fire resistance, oil resistance, corrosion resistance, non toxicity, non pollution, and easy overall installation. Fireproof coatings have the characteristics of thin coating, high fire resistance limit, and strong adhesion. 5、 What is the difference between fire-resistant bridge and fire-resistant bridge

　　防火电缆桥架是现在比较受欢迎的电缆桥架产品，其重要的原因当然就是其具备一定的防火作用。但是防火电缆桥架和耐火电缆桥架确实是两个非常不同的概念。下面我们就来认识一下，看看如何区分：

　　Fireproof cable tray is a popular cable tray product nowadays, and its important reason is of course that it has a certain fireproof effect. But fire-resistant cable trays and fire-resistant cable trays are indeed two very different concepts. Now let's get to know each other and see how to distinguish:

　　防火桥架：

　　Fireproof bridge:

　　主要由玻璃纤维增强材料和无机黏合剂复合的防火板与金属骨架复合以及其他的防火基材组成。采用钢制外壳,双层防火盖板，内装无机防火槽盒 。隔热层平均厚度为25mm,双层盖板通风散热，内喷防火涂料，防火电缆桥架遇火时涂料膨胀,阻塞散热孔，保护槽盒内的电缆。无机防火槽盒防火性能经固定耐火检验中心所对60分钟耐火试验,电缆无损害。支撑的结构性好，可有效地固定无机防火槽盒。　　　耐火桥架：

　　The fireproof board is mainly composed of glass fiber reinforced material and inorganic adhesive composite, metal skeleton composite, and other fireproof substrates. Adopting a steel shell, double-layer fireproof cover plate, and inorganic fireproof groove box inside. The average thickness of the insulation layer is 25mm. The double-layer cover plate is ventilated for heat dissipation, and fireproof coating is sprayed inside. When the fireproof cable tray encounters fire, the coating expands, blocking the heat dissipation holes and protecting the cables inside the trough box. The fire resistance performance of the inorganic fireproof trough box has been tested for 60 minutes by the National Fixed Fire Resistance Inspection Center, and the cable has no damage. The supporting structure is good and can effectively fix inorganic fireproof trough boxes. Fire resistant bridge frame:

　　侧板采用成型机拉制成型，增加了耐火桥架的抗弯强度；侧板和底板采用的技术，表面平整光滑；外表面喷有防火漆，能有效地隔绝空气，达到隔热效果；内侧垫加硅酸铝岩棉和防火板，阻止热量的传导；耐火桥架配有防尘罩，用特殊材料支撑，当发生火灾时，防尘罩脱落封死护罩上所有散热孔，达到防火效果；产品符合防火标准（点击关注建筑10大技术类公众号）。

　　The side panels are drawn and formed by a molding machine, which increases the bending strength of the fire-resistant bridge; The side and bottom plates adopt advanced technology, with a smooth and even surface; The outer surface is sprayed with fireproof paint, which can effectively isolate air and achieve thermal insulation effect; Adding aluminum silicate rock wool and fireproof board on the inner side to prevent heat conduction; The fire-resistant bridge is equipped with a dust cover, supported by special materials. In the event of a fire, the dust cover will fall off and seal all the heat dissipation holes on the cover, achieving the effect of fire prevention; The product complies with the national fire protection standard (click on the official account of 10 major technical categories of buildings).

　　防火桥架指的是结构是由防火材料构成或表面涂有防火涂层；而耐火桥架指的是比较经烧，不会在短时长的高温下发生瘫塌或解体；两者性能都还好，区别只是成本价钱方面的问题。

　　Fireproof bridge refers to a structure composed of fire-resistant materials or coated with fire-resistant coatings on the surface; And fire-resistant bridge refers to a relatively durable structure that will not collapse or disintegrate under short-term high temperatures; Both have decent performance, the only difference being in terms of cost and price.

　　耐火桥架与防火桥架的区别：外壳结构不同、火燃烧温度不同、耐火时间不同。1、外壳结构不同：1）耐火桥架：耐火桥架的外壳及隔热层采用耐高温≥1100℃的防火材料以及耐高温≥300℃的绝缘材料。2）防火桥架：防火桥架的外壳加防火隔层，有些外壳涂防火涂料。

　　The difference between fire-resistant bridge and fire-resistant bridge: different shell structures, different fire combustion temperatures, and different fire-resistant times. 1. Different shell structures: 1) Fire resistant bridge frame: The shell and insulation layer of the fire resistant bridge frame are made of fire-resistant materials with high temperature resistance ≥ 1100 ℃ and insulation materials with high temperature resistance ≥ 300 ℃. 2) Fireproof bridge: The outer shell of the fireproof bridge is equipped with a fireproof partition, and some shells are coated with fireproof paint.

　　2、火燃烧温度不同：1）耐火桥架：耐火桥架的火燃烧温度达到920～1050℃的高温时才会燃烧。2）防火桥架：防火桥架的火燃烧温度达到800度左右。

　　2. The combustion temperature of fire is different: 1) Refractory bridge frame: The fire combustion temperature of refractory bridge frame will only burn when it reaches a high temperature of 920-1050 ℃. 2) Fireproof bridge: The fire combustion temperature of fireproof bridge reaches around 800 degrees.

　　两种桥架工艺不同，锌层厚度不一样，表面颜色也不同，防火桥架一般为类似电箱的灰色，玻璃钢桥架为青绿色（重量较轻），很容易区分。所以两者的使用寿命不一样。防火桥架没有效果，故GB50116-2013标准已经没有金属线槽需要防火措施这一要求。

　　The two types of cable trays have different processes, zinc layer thickness, and surface color. Fireproof cable trays are generally gray similar to electrical boxes, while fiberglass cable trays are blue-green (lighter in weight), making them easy to distinguish. So the service life of the two is different. The fire-resistant cable tray is ineffective, so the GB50116-2013 standard no longer requires fire-resistant measures for metal cable trays.

　　另外，还有采用铝合金材质的铝合金桥架，玻璃钢材质的玻璃钢桥架，等等。这里暂不介绍。

　　In addition, there are aluminum alloy cable trays made of aluminum alloy material, fiberglass cable trays made of fiberglass material, and so on. I won't introduce it here for now.

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