The connectors between the straight segments of the bridge frame and between the straight line segment and the bend and variable diameter straight-through shall be matched by the bridge frame manufacturer.
The thickness of the thin steel plate of the connector should not be less than that of the bridge frame.

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The interface should be flat, free of distortion, bulge and depression, and the half-round head galvanized bolt for connection should be on the inside of the bridge frame. The bolt length should be appropriate. After tightening, the exposed length should be 2–5 teeth.
For the horizontally installed bridge, the connector of its straight segment should be set at about 1max 4 between the two supports and hangers as far as possible.
1.
Under normal circumstances, bridges are not made at the construction site.
When necessary due to special reasons, the existing bridge can be reformed into non-standard bend and variable diameter straight-through.
When reforming and cutting off the straight-line bridge, gas or electric welding shall not be used and special cutting tools shall be used.
The reformed bridge must be flat and repainted in time, and the color of the topcoat should be similar to that of other bridges.
two。
2. Where the bridge crosses the expansion joints of the building, according to GB50168 regulations, expansion joints should be set up to ensure that the bridge and the cables laid in the bridge can stretch freely and not be damaged when the expansion of the building does not endanger its own safety.
Because in new buildings, the installation of bridges is usually carried out months or even a year after the completion of the concrete structure project, and the shrinkage of concrete decreases gradually.
The amount of expansion generally does not exceed the width of the building expansion joint L.
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 done according to the actual situation.
At least one side of the bridge to cross the expansion joint has a long straight line segment, which should be more than 30m, or the straight line segments on both sides of the expansion joint add up to 30m, and there is no horizontal or vertical bend in the middle.
In order to leave the expansion margin of the cable (or wire) in the bridge tray, this margin should be greater than the expansion joint width L.