During the installation of Shandong cable bridge, the fixing bolts between the ladder, tray and tray box and the bracket and the connecting plate shall be fastened without omission, and the nuts shall be located outside the ladder, tray and tray box; When the aluminum alloy ladder, tray and trough box are fixed with the steel bracket, there should be mutual insulation measures to prevent electrochemical corrosion. 10% of the fixed points of the ladder or tray or slot box of each inspection lot shall be randomly inspected, and no less than 2 points shall be inspected.
The ladder, tray and trough box laid in the electrical shaft where it passes through the floor and different fire zones shall be provided with fire partition measures.
For the cable ladder or tray laid in the electrical shaft, the fixed support shall not be installed on the cross arm of the fixed cable, and the load-bearing support shall be set every 3~5 layers.
For ladder, tray and trough box laid outdoors, rain-proof measures shall be taken when entering indoor or distribution box (cabinet), and drain hole shall be set at the bottom of trough box.
The support shall not be welded on the steel structural members of the load-bearing building, and the holes shall not be hot-processed.
The support spacing for horizontal installation should be 1.5m~3.0m, and the support spacing for vertical installation should not be greater than 2m.
When the metal hanger is used for fixing, the diameter of round steel shall not be less than 8mm, and there shall be anti-shaking support, and there shall be fixed support at the branch or 0.3m~0.5m at the end.
The setting of supports and hangers shall comply with the requirements of design or product technical documents, and the installation of supports and hangers shall be firm and obvious distortion; When welding and fixing with embedded parts, the weld shall be full; When the expansion bolt is fixed, the bolt shall be suitable, the anti-loose parts shall be complete, and the connection shall be tight. Spot check 10% of the total number of supports in each inspection lot, and no less than 1 support each, and cover the installation form of the support.
Metal supports shall be protected against corrosion, and those located outdoors and in damp places shall be treated according to design requirements. Spot check 10% of the total number of metal supports in each inspection lot, and no less than 1.
The relevant contents of the observation and inspection items during the bridge installation are the above. If you have any questions about this, please come to our website http://www.yeeones.com Consult and understand!