The quality of cable tray installation is not only related to the beauty and reliability of cable laying, but also directly affects the overall installation process of substation. In the electrical installation project, the installation progress of cable tray has a great impact on the whole project construction period. Generally, the installation amount of cable tray in the cable interlayer of the electrical main control building and electrical room is very large.

安裝主要步驟為：立柱安裝、托臂安裝、橋架安裝和接地線安裝等。立柱安裝之前需人工使用棉線對位，具體步驟為：從始端終端找好水平線或垂直線，用粉線袋沿墻壁、頂棚等處，沿線路的中線彈線，并用筆標出具體位置。安裝之后的橋架需測量復檢，達到如下指標：各支架的同層橫檔應在同一水平面上，其高低差不應大于5mm，托架支吊架沿橋架走向左右的偏差不應大于10mm。

The main installation steps are: column installation, bracket installation, bridge installation, grounding wire installation, etc. Before column installation, cotton thread shall be used for alignment manually. The specific steps are as follows: find the horizontal line or vertical line from the beginning to the end, snap the line along the wall, ceiling, etc. with chalk bag, and mark the specific position with pen. After installation, the bridge shall be measured and rechecked to meet the following indicators: the rungs on the same floor of each support shall be on the same horizontal plane, the height difference shall not be greater than 5mm, and the left and right deviation of bracket supports and hangers along the bridge direction shall not be greater than 10mm.

在變電站施工中，橋架裝置作業是一項非常重要的環節，一般主控樓、電氣室電纜夾層都需求很多裝置電纜橋架，而橋架裝置施工周期很長，其進展對整個工程工期影響非常大。橋架裝置一般選用吊錘、棉線測定立柱和托臂方位，耗時耗力，通過一系列變電工程的建造實踐。

In the construction of substation, the operation of bridge device is a very important link. Generally, the cable interlayer of main control building and electrical room needs a lot of cable bridges, and the construction cycle of bridge device is very long, and its progress has a great impact on the whole project construction period. The crane hammer and cotton thread are generally used for the bridge device to measure the orientation of the column and support arm, which is time-consuming and labor-consuming. Through the construction practice of a series of substation projects.

裝置隊立異運用激光投線儀投射定位線的定位辦法替代人工定位，使得立柱裝置、托臂裝置、調整進程功率得以進步。通過多個變電站工程實踐，證明該辦法既能滿意施工和丈量精度，又進步了施工功率。

The device team innovatively uses the positioning method of projecting the positioning line with the laser line projector instead of manual positioning, so that the column device, arm device and adjustment process power can be improved. Through the engineering practice of several substations, it is proved that this method can not only satisfy the construction and measurement accuracy, but also improve the construction power.

托臂裝置時在始末兩頭和轉彎處依照規則高度先裝置兩只托臂，再在兩托臂間拉一水平線(這兩個托臂要裝置規矩)，然后按線裝置其他托臂。終將使用線垂、水平尺將整排托臂調正，各托臂的同層橫檔應在同一水平面上，其凹凸誤差不大于5mm,使整排托臂到達橫平豎直。

When installing the supporting arm, first install two supporting arms at both ends and corners according to the regular height, then pull a horizontal line between the two supporting arms (the two supporting arms shall be installed regularly), and then install other supporting arms according to the line. Finally, the plumb line and level ruler will be used to align the whole row of supporting arms. The rungs on the same floor of each supporting arm shall be on the same horizontal plane, and the concave convex error shall not be greater than 5mm, so that the whole row of supporting arms can reach horizontal and vertical.

托臂定位需在前后兩條立柱上丈量出一切托臂方位，前后兩排通線，用角尺在其它立柱劃出托臂的定位線，一條立柱托臂定位均勻耗時15分鐘。由此可見橋架裝置的定位環節選用人工丈量完結，費時吃力。其瓶頸在于：在立柱、托臂定位劃線環節耗費了很多人力物力。

For bracket positioning, all bracket orientations shall be measured on the front and rear columns, the front and rear rows of through lines, and the positioning line of the bracket shall be drawn on other columns with an angle ruler. The bracket positioning of one column takes 15 minutes. It can be seen that the positioning link of the bridge device is completed by manual measurement, which is time-consuming and laborious. The bottleneck is that it consumes a lot of manpower and material resources in the positioning and marking of columns and supporting arms.