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.

安装主要步骤为：立柱安装、托臂安装、桥架安装和接地线安装等。立柱安装之前需人工使用棉线对位，具体步骤为：从始端终端找好水平线或垂直线，用粉线袋沿墙壁、顶棚等处，沿线路的中线弹线，并用笔标出具体位置。安装之后的桥架需测量复检，达到如下指标：各支架的同层横档应在同一水平面上，其高低差不应大于5mm，托架支吊架沿桥架走向左右的偏差不应大于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.

在变电站施工中，桥架装置作业是一项非常重要的环节，一般主控楼、电气室电缆夹层都需求很多装置电缆桥架，而桥架装置施工周期很长，其进展对整个工程工期影响非常大。桥架装置一般选用吊锤、棉线测定立柱和托臂方位，耗时耗力，通过一系列变电工程的建造实践。

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.

装置队立异运用激光投线仪投射定位线的定位办法替代人工定位，使得立柱装置、托臂装置、调整进程功率得以进步。通过多个变电站工程实践，证明该办法既能满意施工和丈量精度，又进步了施工功率。

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.

托臂装置时在始末两头和转弯处依照规则高度先装置两只托臂，再在两托臂间拉一水平线(这两个托臂要装置规矩)，然后按线装置其他托臂。终将使用线垂、水平尺将整排托臂调正，各托臂的同层横档应在同一水平面上，其凹凸误差不大于5mm,使整排托臂到达横平竖直。

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.

托臂定位需在前后两条立柱上丈量出一切托臂方位，前后两排通线，用角尺在其它立柱划出托臂的定位线，一条立柱托臂定位均匀耗时15分钟。由此可见桥架装置的定位环节选用人工丈量完结，费时吃力。其瓶颈在于：在立柱、托臂定位划线环节耗费了很多人力物力。

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.