1、荷载等级：别只写"重型"，要写具体数值

1. Load level: Don't just write 'heavy', write specific values

大跨距桥架的荷载分为轻型、中型、重型三档，但"重型"只是一个笼统分类。合同中建议直接标注均布荷载数值，比如"荷载等级：750N/m"或"1000N/m"。不同数值对应的板材厚度、加强筋数量差别很大，口头说"够用"到了验收环节容易扯皮。

The load of large-span bridge frames is divided into three categories: light, medium, and heavy, but "heavy" is only a general classification. It is recommended to directly indicate the uniformly distributed load value in the contract, such as "load level: 750N/m" or "1000N/m". The thickness of the board and the number of reinforcing ribs corresponding to different values vary greatly, and it is easy to argue verbally that they are "sufficient" in the acceptance stage.

2、跨距长度：超6米和超8米，支撑方案完全不同

2. Span length: over 6 meters and over 8 meters, with completely different support schemes

大跨距桥架的"大"到底多大？行业内一般把单跨超过6米的归为大跨距。但6米和8米在支架设计、挠度控制上差异明显。合同里建议注明挠度限值（通常为跨距的1/200）。武汉夏季湿度大、温差变化也不小，跨距越大，热胀冷缩带来的形变风险越高，这一项写清楚能省掉后续不少麻烦。

What is the size of a large-span bridge? In the industry, a single span exceeding 6 meters is generally classified as a large span. But there are significant differences between 6-meter and 8-meter in bracket design and deflection control. It is recommended to specify the deflection limit in the contract (usually 1/200 of the span). Wuhan has high humidity and significant temperature differences in summer. The larger the span, the higher the risk of deformation caused by thermal expansion and contraction. Writing this clearly can save a lot of trouble in the future.

3、防腐工艺：写"镀锌"不够，要写镀锌层厚度

3. Anti corrosion process: Writing 'galvanized' is not enough, the thickness of the galvanized layer needs to be written

武汉地处长江中游，空气湿度常年偏高，防腐是大跨距桥架绕不开的话题。合同中只写"热镀锌"三个字。建议写明"镀锌层厚度≥65μm"或"喷塑厚度≥60μm"，并约定盐雾测试标准。这个参数直接决定桥架在武汉环境下能用5年还是10年。

Wuhan is located in the middle reaches of the Yangtze River, with high air humidity throughout the year. Corrosion prevention is an unavoidable topic for large-span bridge structures. The contract only includes the words' hot-dip galvanizing '. Suggest specifying "galvanized layer thickness ≥ 65 μ m" or "spray coating thickness ≥ 60 μ m", and agree on salt spray testing standards. This parameter directly determines whether the bridge can be used for 5 or 10 years in the Wuhan environment.

4、材质与壁厚：写"Q235"不够，要带上公差范围

4. Material and wall thickness: Writing "Q235" is not enough, tolerance range should be included

材质写Q235B还是Q235A，壁厚写1.5mm还是2.0mm，差之毫厘成本差不少。合同中建议同时标注材质牌号和壁厚公差，比如"材质：Q235B，壁厚1.5mm±0.15mm"。这样到货抽检时有明确依据，避免供应商以次充好。

Is the material written as Q235B or Q235A, and is the wall thickness written as 1.5mm or 2.0mm? The difference in cost is quite significant. It is recommended to indicate both the material grade and wall thickness tolerance in the contract, such as "Material: Q235B, wall thickness 1.5mm ± 0.15mm". This will provide a clear basis for sampling upon arrival and avoid suppliers passing off inferior products as good.

大跨距桥架采购，价格固然重要，但合同里这4个参数写清楚，才是真正帮自己避坑。建议武汉的采购方在签合同前逐条核对，有疑问多问一句，总比验收时返工划算。

Purchasing large-span cable trays, while price is important, clearly stating these four parameters in the contract is the real way to avoid pitfalls. It is recommended that the purchasing party in Wuhan check each item before signing the contract, and ask one more question if there are any doubts. It is more cost-effective than rework during acceptance.

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.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 Bridge 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