我们通常先购买一个电缆桥架来估算工程量，一般估算结果与实际出入不大，但有时我们在计算电缆桥架工程量时会出现一些错误，导致估算出的数量与实际出入。比较大，那么桥架工程量计算容易出现哪些误差呢？

We usually purchase a cable tray to estimate the quantities. Generally, the estimated results do not differ from the actual quantities, but sometimes we make some errors in calculating the quantities of cable trays, resulting in the estimated quantities differ from the actual quantities. Relatively large, what errors are prone to occur in the calculation of bridge quantities?

1.缺少物品。有的支架材料只计算直线部分，弯曲部分不计算；一些材料清单根本没有支撑和衣架的项目。对于工程总承包公司，漏项的后果是项目报价阶段报价偏低，采购部门在项目执行阶段总是与供应商签订补充合同，导致企业利润减少总承包公司。

1. missing items. For some support materials, only the straight-line part is calculated, and the bending part is not calculated; Some bill of materials have no support and hanger items at all. For the EPC company, the consequence of missing items is that the quotation at the project quotation stage is low. The procurement department always signs supplementary contracts with suppliers at the project implementation stage, resulting in the reduction of enterprise profits.

2、项目错误。原因是很多设计师对一些概念不清楚，有的将弯管和吊架视为配件，有的将盖板视为主要材料。事实上，电缆桥架的“支架”包括直通部分和弯通部分。电缆桥架的“附件”包括各种连接板、盖板、隔板、压板、端子板、引下线件、紧固件等。

2. Project error. The reason is that many designers are not clear about some concepts, some regard elbows and hangers as accessories, and some regard cover plates as main materials. In fact, the "support" of cable tray includes straight through part and bend through part. "Accessories" of cable tray include various connecting plates, cover plates, partitions, pressing plates, terminal boards, down lead parts, fasteners, etc.

附件不在材料表中，由供应商提供货物。费用包含在支架单价中，项目中供应商无需单独报价。“支吊架”包括支臂、立柱、吊架等，需单独列出，项目中供应商需单独报价。

The accessories are not in the material list, and the supplier shall provide the goods. The cost is included in the unit price of the support, and the supplier does not need to quote separately in the project. "Supports and Hangers" include arms, columns, hangers, etc., which shall be listed separately, and the supplier of the project shall quote separately.

3、统计偏差大，通常数量太小。那么工程报价中如何准确统计电缆桥架的材料呢？一般来说，支架直通部分可以考虑1%~2%的余量，直接计算弯通部分的数量。

3. The statistical deviation is large, and the quantity is usually too small. How to accurately count the materials of cable tray in the project quotation? Generally speaking, the allowance of 1%~2% can be considered for the straight part of the support, and the number of bending parts can be calculated directly.

用桥架全长除以平均柱距（室外柱跨度一般为6m，室内柱跨度一般为3m）得到柱数，并增加2%~4%的余量。桥架总长除以支吊架平均间距，得到支吊架数量，再考虑1%~2%的余量。至于支吊架间距，室内直段支吊架间距一般为1.5～3m，垂直安装的支吊架间距不大于2m。

Divide the total length of the bridge by the average column spacing (the outdoor column span is generally 6m, and the indoor column span is generally 3M) to obtain the number of columns, and increase the margin of 2%~4%. Divide the total length of the bridge by the average spacing of supports and hangers to obtain the number of supports and hangers, and then consider the allowance of 1%~2%. As for the spacing between supports and hangers, the spacing between supports and hangers in the indoor straight section is generally 1.5 ~ 3M, and the spacing between supports and hangers installed vertically is not greater than 2m.

江南app官方入口在哪里看到厂家提醒，非直线段支吊架配置应符合规定：当弯头弯曲半径小于300mm时，应在直段距连接处300-600mm的一侧设置支吊架非线性截面和直线的关系；当弯头的弯曲半径小于300mm时，不小于300mm时，除在直线段与直线交界处300-600mm的直线段一侧设置支吊架外，非线性部分中间应加支吊架。

Jinan Bridge manufacturer reminds that the configuration of supports and hangers in non-linear section shall comply with the regulations: when the bending radius of elbow is less than 300mm, the relationship between non-linear section and straight line of supports and hangers shall be set at the side 300-600mm from the straight section to the joint; When the bending radius of the elbow is less than 300mm and not less than 300mm, in addition to the support and hanger set at the side of the straight section 300-600mm at the junction of the straight section and the straight line, the support and hanger shall be added in the middle of the non-linear part.

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