我們通常先購買一個電纜橋架來估算工程量，一般估算結果與實際出入不大，但有時我們在計算電纜橋架工程量時會出現一些錯誤，導致估算出的數量與實際出入。比較大，那么橋架工程量計算容易出現哪些誤差呢？

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。有的支架材料只計算直線部分，彎曲部分不計算；一些材料清單根本沒有支撐和衣架的項目。對于工程總承包公司，漏項的后果是項目報價階段報價偏低，采購部門在項目執行階段總是與供應商簽訂補充合同，導致企業利潤減少總承包公司。

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、項目錯誤。原因是很多設計師對一些概念不清楚，有的將彎管和吊架視為配件，有的將蓋板視為主要材料。事實上，電纜橋架的“支架”包括直通部分和彎通部分。電纜橋架的“附件”包括各種連接板、蓋板、隔板、壓板、端子板、引下線件、緊固件等。

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，由供應商提供貨物。費用包含在支架單價中，項目中供應商無需單獨報價。“支吊架”包括支臂、立柱、吊架等，需單獨列出，項目中供應商需單獨報價。

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、統計偏差大，通常數量太小。那么工程報價中如何準確統計電纜橋架的材料呢？一般來說，支架直通部分可以考慮1%~2%的余量，直接計算彎通部分的數量。

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.

用橋架全長除以平均柱距（室外柱跨度一般為6m，室內柱跨度一般為3m）得到柱數，并增加2%~4%的余量。橋架總長除以支吊架平均間距，得到支吊架數量，再考慮1%~2%的余量。至于支吊架間距，室內直段支吊架間距一般為1.5～3m，垂直安裝的支吊架間距不大于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.

濟南橋架廠家提醒，非直線段支吊架配置應符合規定：當彎頭彎曲半徑小于300mm時，應在直段距連接處300-600mm的一側設置支吊架非線性截面和直線的關系；當彎頭的彎曲半徑小于300mm時，不小于300mm時，除在直線段與直線交界處300-600mm的直線段一側設置支吊架外，非線性部分中間應加支吊架。

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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