机电安装里非常容易被砍预算的，就是走顶走墙的那一排桥架。很多人觉得“不就是铁皮槽吗”，结果电缆一上架，中间垂成弓、镀锌层两年起皮、消防验收卡在防火封堵上——返工钱比省下的采购价还高。

The most easily budget cut in mechanical and electrical installation is the row of overhead and wall mounted cable trays. Many people think it's just an iron trough, but as soon as the cable is installed, it hangs in a bow in the middle, the galvanized layer starts to peel after two years, and the fire inspection card is stuck on the fireproof sealing - the cost of rework is even higher than the saved purchase price.

选型先抓三件事：看电缆、看环境、看跨距。动力电缆多、要散热，选梯式；弱电和控制线怕干扰，用槽式全封闭；既要防护又要通风，托盘式非常均衡。 环境决定防腐：室内干燥用冷镀就行，地下车库和厂房直接上热浸锌（锌层≥65μm），沿海或化工区别犹豫，304不锈钢或玻璃钢才扛得住盐雾。 跨距超过2米建议算挠度，托臂和吊杆别用薄角钢凑数，8号槽钢+8.8级热镀锌螺栓才是标配，不然维修工踩上去就是一次集中荷载试验。

Three things should be taken into account when selecting a model: looking at the cable, looking at the environment, and looking at the span. Multiple power cables and need to dissipate heat, choose ladder type; Weak current and control lines are afraid of interference, and are fully enclosed in a slot type; Both protection and ventilation are required, and the tray style is the most balanced. Environment determines corrosion prevention: cold plating is sufficient for indoor drying, while hot-dip galvanizing (zinc layer ≥ 65 μ m) is directly applied to underground garages and factories. Coastal or chemical industries are hesitant, and only 304 stainless steel or fiberglass can withstand salt spray. If the span exceeds 2 meters, deflection must be calculated. Thin angle steel should not be used to make up for the number of support arms and suspension rods. The standard configuration is 8 # channel steel and 8.8 grade hot-dip galvanized bolts. Otherwise, if the maintenance worker steps on them, it will be a concentrated load test.

还有两个验收必查点：一是填充率，动力电缆别超40%–50%，留足散热和扩容空间；二是接地与伸缩缝，每段桥架两端跨接接地，直线段超30米留20–30mm伸缩缝，穿防火分区建议做封堵。

There are two essential inspection points for acceptance: first, the filling rate should not exceed 40% -50% for power cables, leaving enough space for heat dissipation and expansion; The second is grounding and expansion joints. Each bridge section is grounded at both ends, and a 20-30mm expansion joint is left for straight sections exceeding 30 meters. When passing through fire compartments, it must be sealed.

找本地有自动线和工程案例的厂子，弯通三通工厂预制、非标按图定做，现场基本不用二次切割，工期至少省一半。

Find a local factory with automatic lines and engineering cases, prefabricate bent tees in the factory, and customize non-standard ones according to the drawings. There is basically no need for secondary cutting on site, saving at least half of the construction period.

本文由济南电缆桥架厂家友情奉献.更多有关的知识请点击:http://www.sddlqj.cn我们将会对您提出的疑问进行详细的解答，欢迎您登录网站留言.

This article is a friendly contribution from Jinan cable tray manufacturer For more information, please click: http://www.sddlqj.cn We will provide detailed answers to your questions. You are welcome to log in to our website and leave a message