The installation of cable tray needs certain accessories. The following four materials for the installation of cable tray in Shandong Province are summarized.

(1)桥架：分别统计出各种型号规格桥架的全长,除一该桥架的标准长度,得出桥架的数量外,再增加1%－2%的余量。

(1) Bridge frame: The total length of each type and specification of the bridge is calculated separately. In addition to the standard length of the bridge, the number of the bridge frame is obtained, and the remaining amount is increased by 1%-2%.

(2)立柱：如采用统一规格的立柱,可用桥架全长除以平均立柱间距,得出立柱数,再增加2%～4%余量。如立柱规格不一,则需分别统计。

(2) Columns: If the column of uniform specification is adopted, the total length of the bridge can be divided by the average spacing of the columns, and the number of columns can be obtained, and the remaining amount can be increased by 2%-4%. If column specifications are different, statistics should be made separately.

(3)托臂：桥架全长除以托臂平均间距,再增加1%～2%余量,极为总需量。

(3) Brackets: The total length of the bridge is divided by the average spacing of brackets, and the additional 1%-2% is needed.

(4)其它部件：按其主体数乘以一定比例(视总厂而定)求得其总数。

(4) Other parts: multiply the number of main parts by a certain proportion (depending on the factory) to get the total number.

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