The connectors between straight sections, between straight sections and bends, and between variable diameter straight sections should use the connectors provided 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.

1.一般情况下不在施工现场制作桥架。由于特殊原因必需时，可利用现有的桥架改制非标准弯通和变径直通。改制和切断直线段桥架时，均不得用气、电焊切割，应用专用切割工具。改制的桥架必须平整，及时补漆，面漆颜色应与其它桥架相近。

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.

2.桥架跨越建筑物的伸缩缝处，按GB50168规定，应设置伸缩缝，保证桥架及敷设在桥架内的电缆在建筑物伸缩不危及其本身时能自由伸缩，不受损坏。因为新建建筑物里，桥架安装一般都在混凝土结构工程完成数月甚一年之后进行，混凝土收缩逐渐减小。伸缩量一般不会超过建筑物伸缩缝宽L。

2. At the expansion joint of the bridge crossing the building, according to GB50168 regulations, expansion joints should be set up to ensure that the bridge and the cables laid inside the bridge can freely expand and not be damaged when the building's expansion does not endanger its own safety. Because in newly built buildings, the installation of cable trays is usually carried out several months or even a year after the completion of concrete structural engineering, and the shrinkage of concrete gradually decreases. The expansion amount generally does not exceed the width L of the building's expansion joint.

3.若发现或从土建单位了解到建筑物伸缩缝较大有可能超过L时，应按实际做好伸缩处理。要跨越伸缩缝的桥架少一侧有较长的直线段，宜超过30m，或伸缩缝两侧直线段桥架相加有30m，中间无水平或垂直弯通。以便于在桥架中留电缆(或电线)的伸缩余量，这个余量应大于伸缩缝宽。

3. If it is found or learned from the civil engineering unit that the expansion joint of the building is likely to exceed L, the expansion treatment should be carried out according to the actual situation. The bridge that needs to cross the expansion joint should have a longer straight section on at least one side, which should exceed 30m, or the straight sections on both sides of the expansion joint should add 30m to the bridge, with no horizontal or vertical bends in the middle. For the convenience of leaving expansion allowance for cables (or wires) in the bridge, this allowance should be greater than the width of the expansion joint.

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