During the installation of the bridge, there are also curved, deformed, and straight connectors between the straight stages, which should be matched by the bridge manufacturer. The thickness of the connecting thin steel plate should not be less than the thickness of the bridge thin steel plate. The interface should be flat, without distortion, protrusion, or depression. The half round head galvanized bolts used for connection should be on the inner side of the bridge, and the bolt length should be appropriate. After tightening, the exposed length should be 2-5 teeth. For horizontally installed cable trays, the connection head of the straight section should be set at around 1/4 of the distance between the two supports and hangers as much as possible.
1. Generally, cable trays are not manufactured on the construction site. If necessary due to special reasons, existing cable trays can be used to modify non-standard bends and variable diameter straights. When restructuring and cutting straight section cable trays, gas or electric welding cutting is not allowed, and special cutting tools should be used. The restructured cable tray must be flat, repainted in a timely manner, and the color of the topcoat should be similar to other cable trays. In new buildings, the bridge installation is usually carried out months or even a year after the completion of the concrete Structural engineering, and the concrete shrinkage gradually decreases. Generally, the expansion amount will not exceed the width L of building Expansion joint.
2. At the Expansion joint where the bridge crosses the building, Expansion joint shall be set according to GB50168 to ensure that the bridge and the cable laid in the bridge can expand freely without damage when the expansion of the building does not endanger its own safety.
3. If it is found or learned from the civil engineering unit that the Expansion joint of the building is large and may exceed L, so as to leave expansion allowance for cables (or wires) in the bridge, this allowance should be greater than the width of Expansion joint L. Expansion and contraction treatment should be done according to the actual situation. At least one side of the bridge to cross the Expansion joint has a long straight section, which should exceed 30m, or the straight section bridges on both sides of the Expansion joint add up to 30m, and there is no horizontal or vertical bend in the middle.