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.
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.
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.
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.
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.
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.