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.

根據施工圖或施工所用電纜應作好電纜牽引力的計算。

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

橋架安裝注意事項：

Precautions for bridge installation:

1.直線段鋼制電纜橋架長度超過30m，鋁合金或玻璃鋼制電纜橋架長度超過15m應設有伸縮節，西安母線槽跨越伸縮縫處設置補償裝置，可用帶伸縮節的橋架。

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.橋架與支架間螺栓、橋架連接板螺栓緊固無遺漏，螺母位于橋架外側，當鋁合金橋架與鋼支架固定時，有相互間絕緣防電化措施腐蝕措施，一般可墊石棉墊。

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.敷設在豎井內和穿越不同防火區的橋架，應按設計要求位置，有防火隔離措施，電纜橋架在電氣豎井內敷設可采用角鋼固定。

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.電纜橋架在穿過防火墻及防火樓板時，應采取防火隔離措施，防止火災沿線路延燃；防火隔離墻、板，應配合土建施工預留洞口，在洞口處預埋好護邊角鋼，施工時根據電纜敷設的層數和根數用L50×50×5角鋼作固定框，同時將固定柜焊在護邊角鋼上；也可以先作好框在土建施工中砌體或澆灌混凝土時安裝在墻、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.

盤、梯架端部之間連接電阻不應大于0.00033Ω并應用等電位聯結測試儀（導通儀）或微Ω表測試，測試西安母線槽應在連接點的兩側進行，對整個橋架全長的兩端連接電阻不應大于0.5Ω或由設計決定，否則應增加接地點，以滿足要求。接地孔應涂層，與涂層接觸的螺栓有一側的平墊應使用帶爪的專用接地墊圈。

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.

伸縮縫或軟連接處需采用編織銅線連接。沿橋架全長另敷設接地干線時，每段（包括非直線段）托盤、梯架應小有一點與接地干線可靠連接；在接地部位的連接處應裝置彈簧墊圈，以免松動。

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.

對于電纜橋架母線槽的支、吊架的配置

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

1、戶內支、吊短跨距一般采取1.5-3m。戶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、非直線段的支、吊架配置就遵循以下原則。當橋架寬度<300mm時，應在距非直線段與直線結合處300-600m的直線段側設置一個支、吊架。當橋架寬度>300mm時，除符合下述條件外，在非直線段中部還應增設一個支、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、拉擠玻璃鋼電纜橋架多層設置時層間距為200，250，300，350mm。

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

4、橋架直線段每隔50m應予留伸縮縫20-30mm（金屬橋架）。

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

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