弱电工程中常用的电缆桥架包括：槽式桥架、托盘式桥架、铝合金桥架和网格式桥架。

　　The commonly used cable trays in weak current engineering include trough trays, tray trays, aluminum alloy trays, and mesh trays.

　　一、槽式桥架和托盘式桥架的区别

　　1、 The difference between trough bridge and tray bridge

　　槽式电缆桥架与托盘式电缆桥架是都可以敷设电力电缆；断面、结构形式不同而已。封闭的槽盒、无盖的托盘还有梯架都属于电缆桥架，三种桥架的结构形式不同，一些性能也有差异，比如防护性以槽式、梯架差，但通风冷却性却相反。槽式电缆桥架的优势在于屏蔽和防腐，主要适用于铺设截面小但是数量却非常多的电线电缆；而托盘式缆桥架优势在于载荷大和散热好，主要就是用于铺设截面大但是数量比较小的电力电缆。从外形来看，槽式电缆桥架是一种全封闭型电缆桥架。托盘桥架一般指的是有孔的槽式桥架。由于开了散热孔，托盘式桥架板材的厚度要更厚些。

　　Both trough cable trays and tray cable trays can be used to lay power cables; It's just different in cross-section and structural form. Enclosed trough boxes, uncovered trays, and ladder frames all belong to cable trays. The structural forms of the three types of trays are different, and some performance differences exist. For example, trough type trays have the best protection and ladder frame have the worst, but their ventilation and cooling properties are the opposite. The advantage of trough cable tray lies in shielding and anti-corrosion, mainly suitable for laying wires and cables with small cross-sections but a large quantity; The advantage of tray type cable trays lies in their high load capacity and good heat dissipation, mainly used for laying power cables with large cross-sections but relatively small quantities. From the appearance, the trough cable tray is a fully enclosed cable tray. Tray trays generally refer to perforated trough trays. Due to the opening of heat dissipation holes, the thickness of the tray type bridge board needs to be thicker.

　　槽式桥架托盘式桥架

　　Trough type bridge tray type bridge

　　1、槽式电缆桥架主要特点是屏蔽干扰，抗腐蚀，防火，对控制电缆屏蔽干扰和重腐蚀环境中电缆的防护都有较好效果，对控制电缆屏蔽干扰和重腐蚀环境中电缆的防护都有较好效果。适用于敷设计算机电缆、通信电缆、热电偶电缆及高灵敏系统的控制电缆等。用于敷设截面小但数量多的电线电缆。这也是弱电工程中经济实用的一种桥架。

　　1. The main characteristics of trough cable trays are shielding interference, corrosion resistance, and fire prevention. They have good effects on controlling cable shielding interference and protecting cables in heavily corrosive environments. They also have good effects on controlling cable shielding interference and protecting cables in heavily corrosive environments. Suitable for laying computer cables, communication cables, thermocouple cables, and control cables for high-sensitivity systems. Used for laying wires and cables with small cross-sections but large quantities. This is also the most economical and practical type of cable tray in weak current engineering.

　　2、托盘式桥架其表面处理可根据用户需要可分为镀锌、静电喷塑和热镀锌三种，防火和抗腐蚀性能要相对差一些，在重腐蚀环境中必须作特殊的防腐处理。托盘桥架底部有很多腰形孔，以利于散热，重量轻、载荷大，主要用于敷设截面大数量较少的电力电缆。

　　2. The surface treatment of tray type bridge can be divided into three types according to user needs: galvanizing, electrostatic spraying, and hot-dip galvanizing. The fire resistance and corrosion resistance are relatively poor, and special anti-corrosion treatment must be carried out in heavily corrosive environments. There are many waist shaped holes at the bottom of the tray bridge to facilitate heat dissipation. It is lightweight and has a large load capacity, mainly used for laying power cables with large cross-sections and few quantities.

　　二、镀锌桥架和热镀锌桥架

　　2、 Galvanized bridge and hot-dip galvanized bridge

　　很多人以为镀锌桥架就是热镀锌桥架，其实是错误的，镀锌桥架不等于热镀锌桥架。热镀锌桥架又可分为“热浸锌”和“热镀锌”两种，镀锌就是“冷镀锌”或“电镀锌”。镀锌桥架是用“冷镀锌板”制造而成，而热镀锌桥架是用冷镀锌桥架经过表面处理浸锌一层热镀锌制造而成，制造工艺不同。冷镀锌桥架的冷镀锌锌层较热镀光亮，但较薄，抗锈蚀能力较弱。热镀锌桥架热镀锌镀层较厚，抗侵蚀能力较强。比镀锌桥架的寿命要长，无论是硬度还是耐冲击，热镀锌是占优势的。当然热镀锌桥架的成本较高。通常在工程应用的镀锌电缆桥架，其实就是冷镀锌桥架，因为热镀锌桥架制作成本较贵，厂家很少会堆积库存的，施工要求较高的工地会用到热镀锌桥架，客户去采购指定要“热镀锌桥架”，厂家才会生产定制。

　　Many people think that galvanized cable trays are hot-dip galvanized cable trays, but it is actually wrong. Galvanized cable trays are not equal to hot-dip galvanized cable trays. Hot dip galvanized cable trays can be divided into two types: "hot-dip galvanizing" and "hot-dip galvanizing", with galvanizing being either "cold galvanizing" or "electro galvanizing". Galvanized cable tray is made of "cold galvanized sheet", while hot-dip galvanized cable tray is made of a layer of hot-dip galvanizing after surface treatment of cold galvanized cable tray, with different manufacturing processes. The cold galvanized zinc layer of the cold galvanized bridge is brighter than that of the hot-dip coating, but thinner and has weaker corrosion resistance. The hot-dip galvanized bridge has a thick hot-dip galvanized coating and strong corrosion resistance. The lifespan of galvanized cable trays is longer, and hot-dip galvanizing has an absolute advantage in terms of hardness and impact resistance. Of course, the cost of hot-dip galvanized cable trays is relatively high. The galvanized cable tray commonly used in engineering applications is actually a cold galvanized tray, because the production cost of hot-dip galvanized trays is relatively expensive, and manufacturers rarely accumulate inventory. Construction sites with high construction requirements will use hot-dip galvanized trays, and customers will purchase specified "hot-dip galvanized trays" before manufacturers can produce customized ones.

　　三、铝合金桥架

　　3、 Aluminum alloy bridge frame

　　铝合金电缆桥架具有外观漂亮、结构简单、式样独特、荷载能力大、重量轻等特点。铝合金电缆桥架表面阳极氧化后，它不但抗腐蚀、还有抗电磁干扰，尤其是抗屏蔽干扰，这是钢制桥架不可替代的。当然也较钢制桥架高很多。缺点是不适用于工程防火要求较高的场所

　　Aluminum alloy cable trays have the characteristics of beautiful appearance, simple structure, unique style, high load capacity, and light weight. After anodizing on the surface of aluminum alloy cable trays, they are not only corrosion-resistant but also resistant to electromagnetic interference, especially shielding interference, which cannot be replaced by steel cable trays. Of course, the price is much higher than that of steel cable trays. The disadvantage is that it is not suitable for places with high fire prevention requirements in engineering

　　。四、网格式桥架

　　4. Network format cable tray

　　开放式网络桥架顾名思义又称为：金属网格式电缆桥架，开放式电缆桥架，网状桥架。网格式桥架来源于欧洲，是桥架的发展和创新，由于网格式的特点，网格式桥架不适用于室外或有污染腐蚀性的空气及飞溅液体的场合；适用于常见于高集成的数据机房、无尘车间、设备内外的通信、电气线路等……特点：

　　Open network cable tray, as the name suggests, is also known as metal mesh cable tray, open cable tray, or mesh cable tray. Grid format cable trays originated from Europe and are a development and innovation of cable trays. Due to the characteristics of grid formats, grid format cable trays are not suitable for outdoor environments or environments with polluted and corrosive air and splashing liquids; Suitable for high integration data centers, clean rooms, communication inside and outside equipment, electrical circuits, etc. Features:

　　（1）提高了系统升级和维护能力，为升级留有余地；

　　(1) Improved system upgrade and maintenance capabilities, leaving room for upgrades;

　　（2）在综合布线系统可以灵活应用，适用于布线桥架的上下走线；

　　(2) It can be flexibly applied in the comprehensive cabling system and is suitable for the up and down routing of cabling trays;

　　（3）线路和设备的检修非常快速；

　　(3) The maintenance of lines and equipment is very fast and safe;

　　（4）节省了二次重复投资的昂贵成本；

　　(4) Saved the expensive cost of secondary repeated investment;

　　（5）自重仅是传统桥架的1/5；

　　(5) The self weight is only 1/5 of that of traditional cable trays;

　　（6）比传统桥架节省2/3的安装时间；

　　(6) Save 2/3 of installation time compared to traditional cable trays;

　　（7）布线系统和周边生产环境更清洁，卫生和美观；

　　(7) The wiring system and surrounding production environment are cleaner, more hygienic, and aesthetically pleasing;

　　（8）网状的机构使它的散热更好，有效的延长线缆的使用寿命。，在选择电缆桥架的荷载等级时，电缆桥架的工作均布荷载不应大于所选电缆桥架荷载等级的额定均布荷载，如果电缆桥架的支吊架的实际跨距不等于2m时，则工作均布荷载应满足要求。各种组件及支吊架在满足相应荷载的条件下，其规格尺寸应与托盘、梯架的直线段、弯通系列相匹配。工程实际中，在电缆桥架的规格尺寸选择方面的问题是要么偏大，要么偏紧张。如何合理地选择电缆桥架的规格尺寸呢？《民用建筑电气设计规范》（JGJ16-2008）中8、10、7条规定：“电缆总截面积与托盘内横断面积的比值，电力电缆不应大于40%；控制电缆不应大于50%。”

　　(8) The mesh like structure improves its heat dissipation and effectively extends the service life of the cable. Finally, when selecting the load level of the cable tray, the working uniform load of the cable tray should not exceed the rated uniform load of the selected cable tray load level. If the actual span of the support and hanger of the cable tray is not equal to 2m, the working uniform load should meet the requirements. The specifications and dimensions of various components and supports and hangers should match the straight sections and bending series of pallets and ladders under the corresponding load conditions. In practical engineering, the problem with selecting the specifications and dimensions of cable trays is either too large or too tight. How to choose the specifications and dimensions of cable trays reasonably? According to Articles 8, 10, and 7 of the "Code for Electrical Design of Civil Buildings" (JGJ16-2008), "The ratio of the total cross-sectional area of cables to the cross-sectional area inside the tray should not exceed 40% for power cables and 50% for control cables

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