Technical preparation:

（1）按照已批準的施工組織設計（施工方案）進行技術、安全交底。

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

（2）施工執行工藝標準、圖集、規范齊全。

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

（3）電纜橋架敷設前，應檢查橋架敷設有無與其他設備、管線交叉或重疊無法施工的地方，施工前應與各工種、監理或建設單位及設計單位協商好，并作好記錄，以保證施工順利進行。

(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）根據施工圖或施工所用電纜應作好電纜牽引力的計算。

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

電纜橋架規格及型號建議符合設計要求，附件齊全；橋架與配件、附件和緊固件各種型鋼均應采用鍍鋅標準件。

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.

各種規格電纜橋架的直線段、彎通、橋架附件及支、吊架立柱及型鋼等有產品合格證，橋架內外應光滑平整，無棱刺，不應有扭曲翹邊等變形現象。

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.

橋架訂貨或制作應按設計要求進行，不應有誤，應反復校核以免造成浪費。

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.

橋架安裝選擇需屏蔽電氣干擾的電纜回路，有腐蝕的場所、易燃粉塵場所，應選用無蓋無孔封閉型托盤，當需要因地制宜的場所，宜選用組裝式托盤或有孔托盤及梯架；在容易積灰和其它需遮蓋的環境或戶外場所，宜帶有蓋板。低壓電力電纜與控制電纜共用同一托盤或梯架時，應選用中間有隔板的托盤或梯架；在托盤、梯架分支、引上、引下處應設適當的彎通；因受空間條件限制不便裝設彎通或有特殊要求時，可選用軟連接板，鉸接板；伸縮縫應設置伸縮板；連接兩段不同寬度或高度的托盤、梯架可配置變寬或變高板。但在施工中，支、吊架和橋架的選擇應依設計或工程布置條件選擇。

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.

托盤、梯架的寬和高度，應按下列要求選擇:

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

(1)電纜在橋架內的填充率，電力電纜不應大于40%；控制電纜不應大于50%。并應留有一定的備用空位，以便今后為增添電纜用；

(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)所選托盤、橋架規格的承載能力應滿足規定。其工作均布荷載不應大于所選托盤、梯架荷載等級的額定均布荷載；

(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)工作均布荷載下的相對撓度不宜大于1/200。

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

托盤、梯架直線段，可按單件標準長度選擇。單件標準長度一般規定為2、3、4、6m。托盤、梯架的寬度與高度常用規格尺寸系列如表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:符號△表示常用規格

Note: The symbol △ represents commonly used specifications

各類彎通及附件規格，應適合工程布置條件，并與托盤、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、吊架規格選擇，應按托盤、梯架規格層數、跨距等條件配置，并應滿足荷載的要求。

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.

鋼制橋架的表面處理方式，應按工程環境條件、重要性、耐久性和技術經濟性等因素進行選擇。一般情況宜按表2.4-2選擇適用工程環境條件的防腐處理方式。當采用表中“T”類防腐方式為鍍鋅鎳合金、高純化等其它防腐處理的橋架，應按規定試驗驗證，并應具有明確的技術質量指標及檢測方式。

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.