Conduct measurement and positioning → fabrication and installation of supports and hangers → installation of bridge trays → grounding treatment
1. Measurement positioning:
Mark the installation position of the bridge using the snap line method, determine the fixed position of the bracket, and mark it properly. The positioning of the cable tray in the vertical shaft should first use the hanging wire method to determine the installation reference line. If the reserved hole is not suitable, it should be adjusted in a timely manner and repaired.
2. Production and installation of supports and hangers
We design the elevation and bridge specifications based on the construction drawings, position them, and then make brackets according to the measured dimensions. The brackets are produced in a factory. Hoisting or wall bracket installation along the bottom of the beam without a suspended ceiling, and hoisting or wall bracket installation inside the suspended ceiling with a suspended ceiling.
In public places without suspended ceilings, combined with structural components and considering the aesthetics of the building and convenient maintenance, installation is carried out on wall or column supports or on the lower chord components of the roof truss. The bracket installed against the wall shall be fixed with expansion bolts, and the spacing between the brackets shall not exceed 2 meters.
Additional supports and hangers should be installed at the connection between straight and non straight sections, at the deformation joints of buildings, and in the middle of non straight sections with a bending radius greater than 300mm. The installation of supports and hangers should ensure that the levelness or verticality of the bridge meets the requirements.
3. Shandong Cable Tray Installation
a. For special shaped cable trays, the on-site measured dimensions will be handed over to the material supplier, who will manufacture them based on the dimensions to reduce on-site processing. The material, model, thickness, and accessories of the bridge meet the design requirements.
b. Before installing the bridge, it is necessary to coordinate with various specialties to avoid conflicts with large-diameter fire pipes, sprinkler pipes, cold and hot water pipes, drainage pipes, air conditioning and exhaust equipment.
c. Lift the bridge to the predetermined position and fix it with bolts to the bracket. Carefully check the size at the turning point. The bridge should be aligned with the building slope, and the arc of the bridge on the arc shaped building wall should be consistent with the building.
The bridge is connected to the bridge using a connecting plate, and the connecting bolts are half round head bolts, with the half round head on the inside of the bridge. The gap between the cable trays must meet the design requirements to ensure that the cable trays of a system are connected as a whole.
d. The bridge crossing the deformation joint of the building shall be treated with Expansion joint according to the enterprise standard Steel Cable Tray Installation Process. When the straight section of the steel bridge exceeds 30m, a Thermal expansion compensation device shall be set.
e. The bridge installation should be horizontal and vertical, neat and aesthetically pleasing, with consistent distance and firm connection. The horizontal deviation within the same horizontal plane should not exceed 5mm/m, and the straightness deviation should not exceed 5mm/m.
4. Grounding treatment
The grounding treatment of cable trays can be achieved by using galvanized connection plates as jumper wires between the galvanized trays, connecting them together. Add galvanized spring washers to the two connecting bolts at both ends of the connecting plate, and use a minimum of 4mm2 soft copper wire for bridging between the cable trays. Then, connect the cable tray to the grounding wire to form an electrical path. There should be no less than two connections between the overall bridge and the grounding main line.
That's all for the explanation of the four major construction sequences of cable trays. I hope you can be helpful. For more information, please come to our website http://0512lc.com Consult and understand!