在济南做工程，桥架选型有个常见误区：只看规格型号，忽略板材厚度和表面处理。结果是验收时一测一个准，返工重来。

There is a common misconception when selecting cable trays for engineering projects in Jinan: only focusing on specifications and models, ignoring the thickness and surface treatment of the panels. The result is that one test is accurate during acceptance, and rework and start over.

板材厚度是桥架的“骨架”。 国家标准对桥架宽度对应的非常小板厚有明确规定：宽度≤150mm时板厚≥1.0mm，150mm<宽度≤300mm时≥1.2mm，300mm<宽度≤500mm时≥1.5mm，500mm<宽度≤800mm时≥2.0mm。济南不少工程项目在招标文件中直接把这条写进技术条款，低于标准厚度的一律退货。原因很简单：厚度不够，承载能力就上不去。电缆敷设后桥架下垂、变形，后期维护时人踩上去更是隐患。

The thickness of the board is the "skeleton" of the bridge. The national standard has clear regulations on the minimum plate thickness corresponding to the width of the bridge frame: when the width is ≤ 150mm, the plate thickness should be ≥ 1.0mm; when 150mm<width ≤ 300mm, it should be ≥ 1.2mm; when 300mm<width ≤ 500mm, it should be ≥ 1.5mm; and when 500mm<width ≤ 800mm, it should be ≥ 2.0mm. Many engineering projects in Jinan directly include this in the technical terms in the bidding documents, and those with a thickness lower than the standard thickness will be returned. The reason is simple: if the thickness is not enough, the load-bearing capacity cannot be increased. After cable laying, the cable tray may sag and deform, and stepping on it during later maintenance is a hidden danger.

表面处理决定桥架能撑几年。 济南地处北方，四季温差大，部分项目还有地下室、泵站等潮湿环境。电镀锌桥架造价低，适合干燥的竖井环境；热镀锌锌层厚度通常要求达到65μm以上，适合室外或腐蚀性较强的场所。如果项目靠近化工区域或沿海方向，铝合金桥架或玻璃钢桥架在耐腐蚀方面更有优势。喷塑处理可以定制颜色，但要注意喷塑层不能算入板厚——有些供应商用“含塑厚度”来凑数，实际钢板差了一大截。

The surface treatment determines how many years the bridge can last. Jinan is located in the north, with large temperature differences throughout the year. Some projects also have damp environments such as basements and pump stations. Electroplated galvanized cable trays have low cost and are suitable for dry vertical shaft environments; The thickness of hot-dip galvanized zinc layer is usually required to be above 65 μ m, suitable for outdoor or highly corrosive places. If the project is located near the chemical industry area or coastal direction, aluminum alloy cable trays or fiberglass cable trays have more advantages in corrosion resistance. Spray coating treatment can customize colors, but it should be noted that the spray coating layer cannot be included in the plate thickness - some suppliers use "plastic thickness" to make up the difference, but the actual steel plate is quite different.

结构形式匹配敷设场景。 梯式桥架通风散热好，适合大直径动力电缆；槽式桥架全封闭，对控制电缆的屏蔽干扰防护效果非常好；托盘式桥架兼顾散热和防护，是石油、化工、电力领域应用非常广的类型。济南的厂房、地下车库、弱电竖井，各自适用的结构形式并不相同。选型前先搞清楚敷设的是什么电缆、走什么路由，比盯着价格表有用得多。

The structural form matches the installation scenario. Ladder style bridge has good ventilation and heat dissipation, suitable for large-diameter power cables; The fully enclosed trough bridge provides the best shielding and interference protection for control cables; Tray type cable trays balance heat dissipation and protection, and are the most widely used type in the fields of petroleum, chemical, and power. The structural forms applicable to factories, underground garages, and weak current shafts in Jinan are not the same. Before selecting, it is much more useful to clarify what cables are being laid and what routes are being taken, rather than staring at the price list.

桥架是隐蔽工程的一部分，装上去之后很少有人再去看它。但恰恰是这种“看不见”的地方，板材差0.2毫米、锌层少10微米，三五年后的差距就出来了。

The bridge frame is a part of the concealed project, and few people go to see it after installation. But it is precisely in these "invisible" areas that the difference between the boards is 0.2 millimeters and the zinc layer is 10 microns less, and the gap will emerge in three to five years.

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