All kinds of elbow fittings of cable tray are generally ordered by the manufacturer. The defects made on site are: first, they are not beautiful, second, they are not used (especially spraying and hot-dip galvanizing), and third, they are time-consuming. In particular, some project supervisors are not allowed to process on site. Therefore, users usually make a list in advance according to the construction drawings, and then directly install them after being ordered by the manufacturer.

電纜橋架裝置過程中，用到的彎頭一般有三種：一種是水平彎，一是筆直上下彎，還有一種是"之"字彎。以下舉例說明這些彎頭制作辦法及公式：例：400×150的橋架做45°"之"字彎從橋架旁邊面取15cm×0.8在橋

In the process of cable tray installation, there are generally three kinds of elbows: one is horizontal bending, one is straight up and down bending, and the other is "zigzag" bending. The following examples illustrate the manufacturing methods and formulas of these elbows: example: 400 × A 45 ° "zigzag" bend shall be made for 150 bridge, and 15cm shall be taken from the side of the bridge × 0.8 at the bridge

然后三個點銜接就成一個45°的等腰三角形（另一邊用同一辦法），然后將這個三角切掉就構成一個45°彎，然后再用要做的高度×1.41為里面的極點再畫三角形，方向與前面那個相反，做出來便是一個45°之字彎。90°彎是取要做的那一面的2倍畫三角。

Then the three points join to form a 45 ° isosceles triangle (the other side uses the same method), then cut off the triangle to form a 45 ° bend, and then use the height to be done × 1.41 draw a triangle for the inner pole. The direction is opposite to the previous one. It is a 45 ° zigzag. The 90 ° bend is to take twice the side to be made and draw a triangle.

總結出來的公式：比方45度的斜度彎頭，你只需記住這句話就知道怎樣做了"爬坡45度，橋架高度乘以0.8平分劃三條線為一個彎，斜邊是爬坡高度乘以1.41,30度是橋架高度乘以0.8除以45乘以30平分劃三條線為一個彎。

For example, for a 45 degree slope elbow, you only need to remember this sentence to know how to do "climbing 45 degrees, the bridge height multiplied by 0.8 bisects three lines as a bend, the slope is the climbing height multiplied by 1.41, and 30 degrees is the bridge height multiplied by 0.8 divided by 45 times 30 bisects three lines as a bend.