电缆桥架施工是电气工程中的重要环节，其工艺流程需严格按照规范执行，确保性和功能性。

　　The construction of cable trays is an important part of electrical engineering, and its process must be strictly executed according to specifications to ensure safety and functionality.

　　下面详细介绍电缆桥架施工流程及关键要点：

　　Below is a detailed introduction to the construction process and key points of cable tray:

　　一、电缆桥架施工准备

　　1、 Preparation for cable tray construction

　　1. 图纸审核

　　1. Drawing review

　　确认设计图纸的桥架走向、规格、标高及与其他管线的交叉位置。

　　Confirm the cable tray direction, specifications, elevation, and intersection position with other pipelines on the design drawings.

　　核对预留孔洞、预埋件位置是否符合要求。

　　Check whether the reserved holes and embedded parts positions meet the requirements.

　　2. 材料与工具准备

　　2. Preparation of materials and tools

　　桥架（槽式、梯式、托盘式等）、支架、连接件、接地线等材料检验（规格、防腐处理）。

　　Inspection of materials such as cable trays (trough, ladder, tray, etc.), brackets, connectors, grounding wires, etc. (specifications, anti-corrosion treatment).

　　准备电钻、切割机、水平仪、扳手等工具。

　　Prepare tools such as electric drills, cutting machines, level gauges, wrenches, etc.

　　3. 技术交底与措施

　　3. Technical disclosure and safety measures

　　施工人员熟悉图纸及规范，进行培训（如高空作业、临时用电防护）。

　　Construction personnel are familiar with the drawings and specifications, and receive safety training (such as high-altitude operations and temporary electrical protection).

　　二、电缆桥架定位放线

　　2、 Cable tray positioning and laying out

　　1. 弹线定位

　　1. Bullet line positioning

　　依据图纸在墙面或顶板标记桥架中心线及支架位置，使用激光仪确保水平/垂直精度。

　　Mark the centerline and support position of the bridge on the wall or roof according to the drawing, and use a laser to ensure horizontal/vertical accuracy.

　　标注转弯、分支、标高变化等关键点。

　　Mark key points such as turns, branches, and elevation changes.

　　2. 间距与避让原则

　　2. Distance and Avoidance Principle

　　桥架与热力管道间距≥0.5m，与其他管道≥0.3m，交叉时采用局部降板或爬升处理。

　　The distance between the bridge and the thermal pipeline is ≥ 0.5m, and ≥ 0.3m with other pipelines. Local lowering or climbing treatment is used when crossing.

　　三、电缆桥架支架安装

　　3、 Installation of cable tray supports

　　1. 支架选型与固定

　　1. Bracket selection and fixation

　　根据荷载选择角钢、通丝吊杆等支架类型，膨胀螺栓固定深度≥螺栓直径的1.2倍。

　　Select bracket types such as angle steel and threaded suspension rods based on the load, and fix expansion bolts with a depth of at least 1.2 times the bolt diameter.

　　间距要求：水平段1.5~3m，垂直段≤2m，转弯处两侧增设支架。

　　Spacing requirement: Horizontal section is 1.5-3m, vertical section is ≤ 2m, and brackets are added on both sides of the turning point.

　　2. 调平与防腐

　　2. Leveling and anti-corrosion

　　支架安装后调整水平度，偏差≤2mm/m，焊接处补刷防锈漆。

　　After the support is installed, the levelness shall be adjusted, the deviation shall be ≤ 2mm/m, and the welding point shall be brushed with antirust paint.

　　四、电缆桥架组装

　　4、 Cable tray assembly

　　1. 主体安装

　　1. Main body installation

　　从起点向终点逐段安装，采用连接板跨接，螺母朝外，缝隙≤2mm。

　　Install section by section from the starting point to the ending point, using connecting plates for bridging, with nuts facing outward and gaps ≤ 2mm.

　　转弯处使用成品弯头，弯曲半径≥电缆小允许半径（如多芯电缆≥12倍直径）。

　　Use finished elbows at the turning point, with a bending radius ≥ the minimum allowable radius of the cable (such as multi-core cables ≥ 12 times the diameter).

　　2. 多层桥架布置

　　2. Multi layer bridge layout

　　强弱电分层敷设：控制电缆在上，电力电缆在下，层间距≥0.3m（或按设计要求）。

　　Layered laying of strong and weak electricity: Control cables are placed on top, power cables are placed on the bottom, and the interlayer spacing is ≥ 0.3m (or according to design requirements).

　　加装隔板分隔不同电压等级电缆。

　　Install partitions to separate cables of different voltage levels.

　　五、接地处理

　　5、 Grounding treatment

　　1. 全程电气连通

　　1. Electrical connectivity throughout the entire process

　　每隔30~50m设置接地点，非镀锌桥架连接处跨接≥4mm?铜芯接地线。

　　Set grounding points every 30-50m, and cross connect copper core grounding wires of ≥ 4mm at non galvanized bridge connections.

　　镀锌桥架可利用连接板作跨接，但需去除接触面涂层确保导通。

　　Galvanized cable trays can use connecting plates for bridging, but the contact surface coating needs to be removed to ensure conductivity.

　　2. 接地电阻测试

　　2. Grounding resistance test

　　整体接地电阻≤4Ω，连接处接触电阻≤0.1Ω。

　　The overall grounding resistance is ≤ 4 Ω, and the contact resistance at the connection is ≤ 0.1 Ω.

　　六、电缆敷设

　　6、 Cable laying

　　1. 敷设前检查

　　1. Pre laying inspection

　　桥架内杂物，检查锐边毛刺处理，避免损伤电缆。

　　Remove debris from the cable tray, inspect sharp edges and burrs to avoid damaging the cables.

　　2. 敷设工艺

　　2. Laying process

　　电缆牵引力≤允许值（如PVC护套电缆≤50N/mm?），转弯处使用滑轮减少摩擦。

　　Cable traction force ≤ allowable value (such as PVC sheathed cable ≤ 50N/mm? ）Use pulleys at turns to reduce friction.

　　固定间距：水平段首尾端、转弯处500mm内设固定点，垂直段每间隔1m固定。

　　Fixed spacing: Fixed points are set within 500mm at the beginning and end of the horizontal section and at the turning point, and fixed every 1m in the vertical section.

　　3. 防火封堵

　　3. Fireproof sealing

　　穿越防火分区时，采用防火泥或耐火板封堵，耐火极限≥1小时。

　　When passing through fire compartments, fireproof mud or fire-resistant boards should be used for sealing, with a fire resistance limit of ≥ 1 hour.

　　七、验收与记录

　　7、 Acceptance and recording

　　1. 质量检查

　　1. Quality inspection

　　桥架水平度偏差≤2‰，垂直度≤5‰，全长偏差≤20mm。

　　The horizontal deviation of the bridge frame is ≤ 2 ‰, the vertical deviation is ≤ 5 ‰, and the total length deviation is ≤ 20mm.

　　接地导通性测试，电缆绝缘测试（如1000V摇表测绝缘≥10MΩ）。

　　Grounding continuity test, cable insulation test (such as insulation ≥ 10M Ω measured by a 1000V megohmmeter).

　　2. 资料归档

　　2. Data archiving

　　整理隐蔽工程验收单、材料合格证、接地测试报告等。

　　Organize concealed engineering acceptance forms, material qualification certificates, grounding test reports, etc.

　　其他关键注意事项

　　Other key precautions

　　伸缩节设置：直线段超过30m时，需加装伸缩节补偿热胀冷缩。

　　Expansion joint setting: When the straight section exceeds 30m, expansion joints need to be installed to compensate for thermal expansion and contraction.

　　标识管理：桥架贴敷走向标签，电缆两端挂编号牌。

　　Identification management: Cable trays are labeled with direction tags, and numbered plates are hung at both ends of the cables.

　　成品保护：施工中避免踩踏桥架，焊接作业时遮盖防火布。

　　Finished product protection: Avoid stepping on the bridge during construction, and cover with fireproof cloth during welding operations.

　　施工中，通过以程的严格执行，可确保电缆桥架系统可靠，为后续设备供电及维护提供基础。

　　During construction, strict implementation of the above process can ensure the safety and reliability of the cable tray system, providing a foundation for subsequent equipment power supply and maintenance.

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