云南昆明大跨距橋架

云南昆明大跨距橋架由拉擠玻璃鋼型材組裝而成，適用于電力電纜、控制電纜、照明電纜及附件。與鐵橋梁相比,它的優點是使用壽命長(一般設計壽命為20年),安裝方便快捷、成本低(只有1 / 4的比例碳鋼、不需要消防建設,一個橋的長度可以達到8米甚至更長),方便切割和沒有維護。

大跨距橋架產品選型要點:

1)電纜橋架、干線及其支吊架在腐蝕性環境中使用時，應采用耐腐蝕的剛性材料制作或作防腐處理。防腐處理方法應滿足工程環境和耐久性的要求。

2)部分的防火要求,電纜梯架和托盤可以添加防火阻燃板,網和其他材料形成一個封閉或半閉結構,適用和耐火涂層表面的電纜橋架及其支持和衣架,整體耐火性能應滿足有關規范或標準的要求。

3)鋁合金電纜橋架不宜在防火要求較高的場所使用。

4)電纜梯架、托盤寬度、高度的選擇應滿足填充率的要求。電纜梯架、托盤的填充率一般可為電力電纜40% - 50%，控制電纜50% - 70%，預留10% - 25%的工程發展余量。

5)選擇電纜橋架的荷載等級時，電纜橋架的工作均布荷載不得大于電纜橋架所選荷載等級的額定均布荷載。如果電纜橋架的支吊架實際跨距不等于2m，則工作均布荷載應滿足要求。

6)在滿足相應荷載的條件下，各部件及支吊架的規格、尺寸應與托盤、梯子系列的直線段、彎頭相匹配。

7)選擇電纜橋架的彎曲或引導上下裝置時，應不小于電纜在電纜橋架內的較小允許彎曲半徑。

8)對于跨距大于6m的鋼制電纜橋架、跨距大于2m的鋁合金電纜橋架或承載要求大于荷載D級的，應根據工程條件進行強度、剛度和穩定性計算或試驗驗證。

9)當幾組電纜橋架在同一高度平行敷設時，應考慮相鄰電纜橋架之間的檢修距離。

Yunnan Kunming long span bridge is assembled by pultruded FRP profiles, suitable for power cables, control cables, lighting cables and accessories. Compared with iron Bridges, it has the advantages of long service life (generally designed for 20 years), easy and quick installation, low cost (only 1/4 of carbon steel, no fire construction, a bridge length can reach 8 meters or more), easy cutting and no maintenance.

Key points of product selection of long-span bridge:

1) When the cable tray, trunk line and its support and hanger are used in corrosive environment, they should be made of corrosion-resistant rigid materials or treated with anticorrosion. The anti-corrosion treatment method should meet the requirements of engineering environment and durability.

2) Part of the fire protection requirements, cable ladder and tray can add fire retardant plate, net and other materials to form a closed or semi-closed structure, applicable and refractory coating surface of the cable tray and its support and hanger, the overall fire resistance should meet the requirements of the relevant specifications or standards.

3) Aluminum alloy cable bridge should not be used in places with higher fire protection requirements.

4) The selection of cable ladder and tray width and height should meet the requirements of filling rate. The filling rate of cable ladder and tray can generally be 40%-50% for power cable, 50%-70% for control cable, and 10%-25% for project development allowance.

5) When selecting the load grade of cable bridge, the uniform load of cable bridge shall not be greater than the rated uniform load of the selected load grade of cable bridge. If the actual span of the support and hanger of the cable bridge is not equal to 2m, the uniform working load should meet the requirements.

6) Under the condition of meeting the corresponding load, the specifications and dimensions of all parts and supports and hangers shall match the straight line and elbow of tray and ladder series.

7) When selecting the bending of the cable tray or guiding the upper and lower devices, it should not be less than the smaller allowable bending radius of the cable in the cable tray.

8) For the steel cable bridge with a span greater than 6m, aluminum alloy cable bridge with a span greater than 2m or the bearing capacity requirements greater than the load of GRADE D, the strength, stiffness and stability should be calculated or verified according to the engineering conditions.

9) When several groups of cable Bridges are laid in parallel at the same height, the maintenance distance between adjacent cable Bridges should be considered.

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