很多山东本地采购员比价时只看“每米单价”，结果货拉到工地，热浸锌写成“镀锌”、板厚标1.5mm实测1.2mm、弯通三通不算钱。结账时才发现总价反而比正规厂贵两成。

Many local buyers in Shandong only look at the "unit price per meter" when comparing prices, but when the goods are delivered to the construction site, they are hot-dip galvanized and labeled as "galvanized", with a plate thickness of 1.5mm and a measured thickness of 1.2mm, and bent tees are not included in the cost. I only found out at checkout that the total price was actually 20% higher than that of a regular factory.

买桥架前把这几项写进合同，比砍价有用：

Writing these items into the contract before buying a bridge frame is more useful than bargaining:

材质和执行标准：钢制写清 JB/T 10216 或 T/CECS 31，别只写“国标”。

Material and execution standards: For steel, please write JB/T 10216 or T/CECS 31 clearly, don't just write "national standard".

板厚按宽度分档：300mm宽侧板至少1.2mm，600mm宽以上做到1.5–2.0mm，用卡尺抽检，负差超0.1mm可退。

Board thickness is classified according to width: 300mm wide side panels should be at least 1.2mm wide, and for widths above 600mm, they should be 1.5-2.0mm wide. They should be checked with a caliper, and if the negative deviation exceeds 0.1mm, they can be returned.

防腐层单独列参数：室内干燥用电镀锌≥12μm，户外、地下室、管廊用热浸锌≥65μm，沿海或化工区直接上锌铝镁或304。

The parameters for the anti-corrosion coating are listed separately: for indoor drying, the galvanized coating should be ≥ 12 μ m, for outdoor, basement, and pipe gallery, the hot-dip galvanized coating should be ≥ 65 μ m, and for coastal or chemical areas, zinc aluminum magnesium or 304 should be directly applied.

配件同等级：弯通、三通、连接片、跨接线（≥4mm²软铜）、螺栓全部和直段同材质，不另算“辅材费”。

Accessories of the same grade: bends, tees, connecting pieces, jumper wires (≥ 4mm ² soft copper), bolts are all made of the same material as the straight section, and do not include "auxiliary material fees".

载荷和跨距：写明2米跨距下的安全工作载荷和挠度限值，大跨距部位单独出图。

Load and span: Specify the safe working load and deflection limit at a span of 2 meters, and provide separate drawings for large span areas.

到货别只数根数。先称一根直段重量，同规格偷薄板一米能轻百分之十几；再刮开切口看锌层，热浸锌切口也有锌花，电镀锌切口发白发灰。这两招现场五分钟就能筛掉大部分劣质货。

Don't just count the number of items upon arrival. First, weigh a straight section. Stealing a thin plate of the same specification can make it lighter by more than ten percent per meter; Scratch open the incision again to see the zinc layer. The hot-dip zinc incision also has zinc flowers, while the electroplated zinc incision turns white and gray. These two moves can screen out most of the inferior goods on site in five minutes.

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This article is a friendly contribution from Shandong 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