山东电缆桥架的直段之间、直段与弯头之间、变径直通的连接件，应使用桥梁生产厂家配套的连接件。连接件薄钢板的厚度不应小于桥架薄钢板的厚度。

The connectors between the straight sections of Shandong cable tray, between the straight sections and elbows, and through reducing shall use the connectors matching the bridge manufacturer. The thickness of the connecting piece steel sheet shall not be less than that of the bridge steel sheet.

界面应平整，无变形、凸起和凹陷。用于连接的半圆头镀锌螺栓应在桥的内侧。螺栓的长度应适当。拧紧后外露长度应为2～5齿。对于水平安装的桥梁，其直段的连接件应尽量设置在两支吊架距离的1/4左右。

The interface shall be flat without deformation, bulge and depression. Half round head galvanized bolts for connection shall be on the inside of the bridge. The length of bolts shall be appropriate. The exposed length after tightening shall be 2 ~ 5 teeth. For horizontally installed bridges, the connectors of the straight sections shall be set at about 1/4 of the distance between the two supports and hangers as far as possible.

一般情况下，施工现场不搭桥。由于特殊原因，现有的桥架可用于制作非标准弯曲和变径。

Generally, there is no bridge at the construction site. Due to special reasons, the existing bridge can be used to make non-standard bending and reducing.

对直段桥进行修改和切割时，不得使用气焊或电焊进行切割，应使用专用切割工具。改造后的桥架必须平整，并及时重新粉刷油漆。面漆的颜色应与其他桥架的颜色相近。

When modifying and cutting the straight section bridge, gas welding or electric welding shall not be used for cutting, and special cutting tools shall be used. The reconstructed bridge must be flat and repainted in time. The color of finish paint shall be similar to that of other bridges.、

在桥梁跨越建筑物的伸缩缝处，按照GB50168的规定，应设置伸缩缝，以保证桥梁和桥内铺设的电缆在不危及建筑物自身的情况下能伸缩自如，不受损坏。

At the expansion joints where the bridge crosses the building, expansion joints shall be set according to the provisions of GB50168 to ensure that the bridge and the cables laid in the bridge can expand freely without damaging the building itself.

因为在新建建筑中，桥梁安装一般在混凝土结构工程竣工后几个月甚至一年后进行，混凝土的收缩率逐渐减小。伸缩量一般不超过建筑物伸缩缝的宽度L。

Because in new buildings, the bridge installation is generally carried out a few months or even a year after the completion of the concrete structure project, and the shrinkage rate of the concrete gradually decreases. Generally, the expansion amount shall not exceed the width l of the expansion joint of the building.

如发现或从土建单位获悉建筑物的伸缩缝有可能超过L，应根据实际情况进行伸缩处理。

If it is found or learned from the civil engineering unit that the expansion joint of the building may exceed L, expansion treatment shall be carried out according to the actual situation.

跨越伸缩缝的桥梁至少一侧有较长的直线段，应超过30m，或伸缩缝两侧的桥梁总长度为30m，且山东电缆桥架的桥梁内不存在水平或垂直弯曲中间。为了在桥架内留出电缆（或电线）的伸缩余量，该余量应大于伸缩缝的宽度L。

At least one side of the bridge crossing the expansion joint has a long straight section, which should be more than 30m, or the total length of the bridge on both sides of the expansion joint is 30m, and there is no horizontal or vertical bending middle in the bridge of Shandong cable tray. In order to reserve expansion allowance for cables (or wires) in the bridge, the allowance shall be greater than the width l of the expansion joint.

此外大多数金属桥的化学性质比较活泼，容易与空气中的氧气和水分发生化学反应，产生腐蚀。即便如此，由于金属的强度和硬度远高于其他物质，金属仍然是工业生产的主要原料。为了防止金属制品在使用过程中受到腐蚀的影响，几乎所有的金属铸件都需要进行涂层处理。涂层可以很好地隔离原始金属与空气，避免腐蚀。涂层保护前，金属表面已轻微生锈，涂层前应清洁表面。

In addition, the chemical properties of most metal bridges are relatively active, and they are easy to react with oxygen and moisture in the air to produce corrosion. Even so, because the strength and hardness of metals are much higher than other substances, metals are still the main raw materials for industrial production. In order to prevent metal products from being affected by corrosion during use, almost all metal castings need coating treatment. The coating can well isolate the original metal from the air and avoid corrosion. Before coating protection, the metal surface has slightly rusted, and the surface shall be cleaned before coating.

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