电缆桥架属于那种“装上去就没人再看”的东西，正因为如此，进场验收环节非常容易被跳过。货到了直接上墙，等验收时才发现问题，拆下来重装比一开始就卡住麻烦得多。

Cable trays belong to the category of things that are "installed and no one looks at them again", which is why the on-site acceptance process is most easily skipped. When the goods arrived, they were directly mounted on the wall. The problem was only discovered during inspection, and dismantling and reassembling them is much more troublesome than getting stuck from the beginning.

第一项：卡尺量板厚，别信标签。

First item: Measure the thickness of the caliper, don't trust the label.

国标对桥架板厚的要求是按宽度分档的：宽度≤150mm不低于1.0mm，150-300mm不低于1.2mm，300-500mm不低于1.5mm，500-800mm不低于2.0mm。很多供应商在标签上标的是“1.2mm”，实际卡尺一量只有0.9mm。板厚不够，承载能力直接打折，电缆敷设后桥架下垂、变形，后期维护时人踩上去更危险。进场时抽几根不同规格的桥架，用卡尺量侧板和底板的实际厚度，比看合格证管用。

The requirements of the national standard for the thickness of cable tray plates are classified according to width: width ≤ 150mm not less than 1.0mm, 150-300mm not less than 1.2mm, 300-500mm not less than 1.5mm, 500-800mm not less than 2.0mm. Many suppliers label it as "1.2mm" on the label, but the actual caliper measurement is only 0.9mm. If the plate thickness is not enough, the bearing capacity will be directly reduced, and the cable tray will sag and deform after cable laying, making it more dangerous for people to step on it during later maintenance. When entering the site, draw several bridge frames of different specifications, measure the actual thickness of the side and bottom plates with calipers, and compare them to see if the certificate of conformity is valid.

第二项：看镀锌层，不是看颜色。

Second item: Look at the galvanized layer, not the color.

电镀锌和热镀锌外观都是银灰色，但耐腐蚀能力差很多。电镀锌锌层薄，通常几微米到十几微米，适合室内干燥环境；热镀锌锌层厚，要求达到65μm以上，适合室外、地下室、潮湿车间。区分方法很简单：用测厚仪量，或者看截面——热镀锌的锌层与钢材之间有一层锌铁合金层，截面能看到明显的过渡层，电镀锌没有。济南不少工程项目在技术条款里直接写明“热镀锌锌层厚度不低于65μm”，验收时拿测厚仪抽检，低于标准的一律退货。

Both electroplated zinc and hot-dip galvanized have a silver gray appearance, but their corrosion resistance is much worse. Electroplated zinc coating is thin, usually ranging from a few micrometers to tens of micrometers, suitable for indoor dry environments; The thickness of hot-dip galvanized zinc layer should be above 65 μ m, suitable for outdoor, basement, and humid workshops. The differentiation method is simple: use a thickness gauge to measure, or look at the cross-section - there is a layer of zinc iron alloy between the zinc layer of hot-dip galvanizing and the steel, and a clear transition layer can be seen on the cross-section, while electroplated galvanizing does not. Many engineering projects in Jinan directly state in the technical terms that the thickness of hot-dip galvanized zinc layer shall not be less than 65 μ m, and during acceptance, a thickness gauge shall be used for sampling. Those below the standard shall be returned.

第三项：查焊缝和毛刺，关系到电缆安全。

The third item: Check for welds and burrs, which are related to cable safety.

桥架的焊缝如果打磨不平整，敷设电缆时可能划伤绝缘层。托盘式桥架的冲孔边缘如果有毛刺，同样有隐患。进场时用手摸一遍侧板和横档的焊缝、冲孔边缘，有明显毛刺或锐边的说明加工工艺不到位。这个问题在低价桥架上尤其常见，因为打磨工序费人工，有些小厂直接省掉了。

If the weld seam of the bridge is not polished flat, it may scratch the insulation layer when laying the cable. If there are burrs on the punched edges of the tray type bridge, there are also hidden dangers. When entering the site, touch the welds and punching edges of the side panels and crossbars with your hand. If there are obvious burrs or sharp edges, it indicates that the processing technology is not in place. This problem is particularly common on low-priced cable trays, as the polishing process requires labor, which some small factories can directly avoid.

顺带说一句附件。

By the way, let me mention the attachment.

桥架的连接片、螺栓、盖板扣件，质量同样重要。连接片厚度不够，螺栓拧紧后变形，接头处就松了。盖板扣件如果是薄铁皮冲压的，几次开合就失去弹性。这些附件通常按套计价，选购时问清楚材质和厚度，别只盯着桥架主体。

The quality of the connecting pieces, bolts, and cover plate fasteners of the bridge is equally important. The thickness of the connecting piece is not enough, and the bolt deforms after tightening, causing the joint to loosen. If the cover plate fastener is stamped with thin iron sheet, it will lose its elasticity after several opening and closing cycles. These accessories are usually priced by set. When purchasing, ask for the material and thickness clearly, and don't just focus on the main body of the bridge.

桥架进场验收的逻辑很清晰：卡尺量板厚，测厚仪量锌层，手摸焊缝毛刺，顺带检查附件质量。这三项花不了多少时间，但能避免装上去之后再返工的麻烦。

The logic of the bridge entry acceptance is very clear: measuring the thickness of the plate with a caliper, measuring the zinc layer with a thickness gauge, touching the weld burrs with your hand, and checking the quality of the accessories. These three items may not take much time, but they can avoid the trouble of rework after installation.

本文由济南电缆桥架友情奉献。更多有关的知识请点击：http://www.sdhangfeng.com 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 Bridge. For more information, please click: http://www.sdhangfeng.com We will provide detailed answers to your questions. You are welcome to log in to our website and leave a message.