Technical preparation:

（1）按照已批准的施工组织设计（施工方案）进行技术、安全交底。

(1) Conduct technical and safety disclosure in accordance with the approved construction organization design (construction plan).

（2）施工执行工艺标准、图集、规范齐全。

(2) The construction execution process standards, atlases, and specifications are complete.

（3）电缆桥架敷设前，应检查桥架敷设有无与其他设备、管线交叉或重叠无法施工的地方，施工前应与各工种、监理或建设单位及设计单位协商好，并作好记录，以保证施工顺利进行。

(3) Before laying the cable tray, check whether there is any place where the cable bridge laying crosses or overlaps with other equipment and pipelines and cannot be constructed. Before construction, negotiate with each type of work, the supervisor, the construction unit and the design unit, and make records to ensure the smooth construction.

（4）根据施工图或施工所用电缆应作好电缆牵引力的计算。

(4) According to the construction drawings or cables used in construction, the calculation of cable traction force should be done.

电缆桥架规格及型号必须符合设计要求，附件齐全；桥架与配件、附件和紧固件各种型钢均应采用镀锌标准件。

The specification and model of cable tray must meet the design requirements, with complete accessories; All types of steel sections for bridge and accessories, accessories, and fasteners should be galvanized standard parts.

各种规格电缆桥架的直线段、弯通、桥架附件及支、吊架立柱及型钢等有产品合格证，桥架内外应光滑平整，无棱刺，不应有扭曲翘边等变形现象。

The straight sections, bends, cable tray accessories, supports and hangers, columns and profile steel of various specifications of cable tray shall be provided with product certificates. The inside and outside of the cable tray shall be smooth and flat without burrs, distortion, edge warping and other deformation phenomena.

桥架订货或制作应按设计要求进行，不应有误，应反复校核以免造成浪费。

The ordering or production of the bridge should be carried out according to the design requirements, and there should be no errors. It should be repeatedly checked to avoid waste.

桥架安装选择需屏蔽电气干扰的电缆回路，有腐蚀的场所、易燃粉尘场所，应选用无盖无孔封闭型托盘，当需要因地制宜的场所，宜选用组装式托盘或有孔托盘及梯架；在容易积灰和其它需遮盖的环境或户外场所，宜带有盖板。低压电力电缆与控制电缆共用同一托盘或梯架时，应选用中间有隔板的托盘或梯架；在托盘、梯架分支、引上、引下处应设适当的弯通；因受空间条件限制不便装设弯通或有特殊要求时，可选用软连接板，铰接板；伸缩缝应设置伸缩板；连接两段不同宽度或高度的托盘、梯架可配置变宽或变高板。但在施工中，支、吊架和桥架的选择应依设计或工程布置条件选择。

Cable trays should be installed in cable circuits that need to be shielded from electrical interference. In areas with corrosion or flammable dust, closed trays without covers or holes should be selected. When local conditions are required, assembled trays or perforated trays and ladders should be selected; In environments or outdoor areas that are prone to dust accumulation and require covering, it is advisable to have a cover plate. When low-voltage power cables and control cables share the same tray or ladder, a tray or ladder with a partition in the middle should be selected; Appropriate bends should be set up at the branches, leads up, and leads down of trays and ladders; When it is not convenient to install bends due to space limitations or there are special requirements, soft connection plates or hinged plates can be used; Expansion joint shall be provided with expansion board; Connecting two trays or ladders with different widths or heights can be configured with widened or raised boards. However, in construction, the selection of supports, hangers, and cable trays should be based on design or engineering layout conditions.

托盘、梯架的宽和高度，应按下列要求选择:

The width and height of trays and ladders should be selected according to the following requirements:

(1)电缆在桥架内的填充率，电力电缆不应大于40%；控制电缆不应大于50%。并应留有一定的备用空位，以便今后为增添电缆用；

(1) The filling rate of cables in the bridge should not exceed 40% for power cables; The control cable should not exceed 50%. And a certain amount of spare space should be left for future use in adding cables;

(2)所选托盘、桥架规格的承载能力应满足规定。其工作均布荷载不应大于所选托盘、梯架荷载等级的额定均布荷载；

(2) The bearing capacity of the selected tray and bridge specifications should meet the regulations. The working uniform load should not exceed the rated uniform load of the selected pallet and ladder load level;

(3)工作均布荷载下的相对挠度不宜大于1/200。

(3) The relative deflection under uniform working load should not exceed 1/200.

托盘、梯架直线段，可按单件标准长度选择。单件标准长度一般规定为2、3、4、6m。托盘、梯架的宽度与高度常用规格尺寸系列如表2.4-1。

Tray and ladder straight sections can be selected according to the standard length of a single piece. The standard length of a single piece is generally specified as 2, 3, 4, and 6 meters. The commonly used specifications and dimensions for the width and height of trays and ladders are shown in Table 2.4-1.

注:符号△表示常用规格

Note: The symbol △ represents commonly used specifications

各类弯通及附件规格，应适合工程布置条件，并与托盘、梯架配套。

The specifications of various bends and accessories should be suitable for the engineering layout conditions and matched with trays and ladders.

支、吊架规格选择，应按托盘、梯架规格层数、跨距等条件配置，并应满足荷载的要求。

The selection of support and hanger specifications should be based on the specifications of trays, ladders, layers, spans, and other conditions, and should meet the load requirements.

钢制桥架的表面处理方式，应按工程环境条件、重要性、耐久性和技术经济性等因素进行选择。一般情况宜按表2.4-2选择适用工程环境条件的防腐处理方式。当采用表中“T”类防腐方式为镀锌镍合金、高纯化等其它防腐处理的桥架，应按规定试验验证，并应具有明确的技术质量指标及检测方式。

The surface treatment method of steel cable trays should be selected based on factors such as engineering environmental conditions, importance, durability, and technical economy. Generally, it is advisable to choose the anti-corrosion treatment method suitable for the engineering environmental conditions according to Table 2.4-2. When using the "T" type anti-corrosion method in the table, such as galvanized nickel alloy, high-purity and other anti-corrosion treatments, the bridge should be tested and verified according to regulations, and should have clear technical quality indicators and testing methods.