Before laying the cable tray, check whether the cable tray is crossed or overlapped with other equipment and pipelines. Before construction, negotiate with each type of work, supervisor or construction unit and design unit, and make records to ensure smooth construction.

根据施工图或施工所用电缆应作好电缆牵引力的计算。

The cable traction shall be calculated according to the construction drawings or cables used in construction.

桥架安装注意事项：

Precautions for bridge installation:

1.直线段钢制电缆桥架长度超过30m，铝合金或玻璃钢制电缆桥架长度超过15m应设有伸缩节，西安母线槽跨越伸缩缝处设置补偿装置，可用带伸缩节的桥架。

1. The length of the steel cable bridge in the straight section is more than 30m, and the length of the aluminum alloy or glass fiber reinforced plastic cable bridge is more than 15m. The expansion joint should be set up. The compensation device should be set at the place where the Xi'an bus duct crosses the expansion joint. The bridge with expansion joint can be used.

2.桥架与支架间螺栓、桥架连接板螺栓紧固无遗漏，螺母位于桥架外侧，当铝合金桥架与钢支架固定时，有相互间绝缘防电化措施腐蚀措施，一般可垫石棉垫。

2. The bolts between the cable tray and the support and the cable tray connecting plate bolts are fastened without omission. The nuts are located outside the cable tray. When the aluminum alloy cable tray and the steel support are fixed, there are mutual insulation and anti-electrochemical measures for corrosion. Generally, asbestos pads can be used.

3.敷设在竖井内和穿越不同防火区的桥架，应按设计要求位置，有防火隔离措施，电缆桥架在电气竖井内敷设可采用角钢固定。

3. The cable tray laid in the shaft and crossing different fire zones shall be provided with fire isolation measures according to the design requirements. The cable tray laid in the electrical shaft can be fixed with angle steel.

4.电缆桥架在穿过防火墙及防火楼板时，应采取防火隔离措施，防止火灾沿线路延燃；防火隔离墙、板，应配合土建施工预留洞口，在洞口处预埋好护边角钢，施工时根据电缆敷设的层数和根数用L50×50×5角钢作固定框，同时将固定柜焊在护边角钢上；也可以先作好框在土建施工中砌体或浇灌混凝土时安装在墙、板中。

4. When the cable tray passes through the firewall and fire floor, fire isolation measures shall be taken to prevent the fire from spreading along the line; For fire separation walls and plates, openings shall be reserved in coordination with civil construction. Edge protection angle steel shall be embedded at the openings. L50 shall be used according to the number of layers and pieces of cable laying during construction × fifty × 5 The angle steel is used as the fixing frame, and the fixing cabinet is welded on the edge protection angle steel at the same time; The frame can also be installed in the wall and slab during masonry or concrete pouring in the civil construction.

盘、梯架端部之间连接电阻不应大于0.00033Ω并应用等电位联结测试仪（导通仪）或微Ω表测试，测试西安母线槽应在连接点的两侧进行，对整个桥架全长的两端连接电阻不应大于0.5Ω或由设计决定，否则应增加接地点，以满足要求。接地孔应涂层，与涂层接触的螺栓有一侧的平垫应使用带爪的专用接地垫圈。

The connection resistance between the ends of the tray and ladder shall not be greater than 0.00033 Ω and shall be tested by equipotential bonding tester (continuity tester) or micro-ohm meter. The test of Xi'an bus duct shall be conducted on both sides of the connection point. The connection resistance at both ends of the whole bridge length shall not be greater than 0.5 Ω or determined by the design, otherwise the grounding point shall be added to meet the requirements. The coating shall be removed from the grounding hole, and the flat pad on one side of the bolt in contact with the coating shall use a special grounding washer with claws.

伸缩缝或软连接处需采用编织铜线连接。沿桥架全长另敷设接地干线时，每段（包括非直线段）托盘、梯架应小有一点与接地干线可靠连接；在接地部位的连接处应装置弹簧垫圈，以免松动。

The expansion joint or soft joint shall be connected with braided copper wire. When laying the grounding trunk line along the whole length of the bridge, the tray and ladder of each section (including the non-linear section) shall be reliably connected with the grounding trunk line at least at one point; A spring washer shall be installed at the connection of the grounding part to avoid loosening.

对于电缆桥架母线槽的支、吊架的配置

Configuration of supports and hangers for cable tray and bus duct price

1、户内支、吊短跨距一般采取1.5-3m。户外立柱中跨距一般采取6m。

1. The short span of indoor support and hoisting is generally 1.5-3m. The mid-span of outdoor column is generally 6m.

2、非直线段的支、吊架配置就遵循以下原则。当桥架宽度<300mm时，应在距非直线段与直线结合处300-600m的直线段侧设置一个支、吊架。当桥架宽度>300mm时，除符合下述条件外，在非直线段中部还应增设一个支、吊架。

2. The following principles shall be followed for the configuration of supports and hangers of non-linear sections. When the bridge width is less than 300mm, a support and hanger shall be set at the side of the straight section 300-600m away from the junction of the non-straight section and the straight line. When the bridge width is more than 300mm, in addition to meeting the following conditions, a support and hanger shall be added in the middle of the non-linear section.

3、拉挤玻璃钢电缆桥架多层设置时层间距为200，250，300，350mm。

3. The center distance between layers is 200250300350mm when the pultruded FRP cable tray is set in multiple layers.

4、桥架直线段每隔50m应予留伸缩缝20-30mm（金属桥架）。

4. 20-30mm expansion joint (metal bridge) shall be reserved every 50m in the straight section of the bridge.

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