1、根据桥架的平面布置，各层标高及桥架进出建筑物的中心坐标进行定位划线，也可采用粉线或细铁线。

　　1. According to the layout of the bridge frame, the elevation of each floor and the center coordinates of the bridge frame entering and exiting the building can be positioned and marked, and powder lines or fine iron lines can also be used.

　　2、如果厂家未提供立柱及托臂成品，可根据设计要求现场制作或预制，制作时应将材料矫正平直，下料误差在5mm范围内，切口处不应有卷边和毛刺。制作好的支架应牢固、平整、尺寸准确，并按设计要求涂刷防腐漆。

　　2. If the manufacturer does not provide finished columns and support arms, they can be made on site or prefabricated according to design requirements. During production, the materials should be straightened and the cutting error should be within 5mm. There should be no curled edges or burrs at the cut. The fabricated bracket should be firm, flat, accurately sized, and coated with anti-corrosion paint according to design requirements.

　　3、立柱和托臂在金属结构上或混凝土构筑物的预埋件上固定时，应采用焊接固定，并应有合格焊工持证上岗；焊接应牢固，无明显变形。

　　3. When fixing columns and support arms on metal structures or embedded parts of concrete structures, welding should be used for fixation, and qualified welders with certificates should be employed; Welding should be firm and without obvious deformation.

　　4、立柱和托臂在混凝土上固定时，易采用预埋螺栓或膨胀螺栓固定，膨胀螺栓的选用应满足桥架安装的强度和设计要求。

　　4. When fixing columns and support arms on concrete, it is easy to use embedded bolts or expansion bolts for fixation. The selection of expansion bolts should meet the strength and design requirements of bridge installation.

　　5、在不允许焊接支架的工艺管道上及其他场合应采用“U”型卡子、双头螺栓、圆钢吊杆或抱箍固定。

　　5. U-shaped clips, double headed bolts, round steel hangers or clamps should be used for fixing on process pipelines and other occasions where welding brackets is not allowed.

　　6、各支架的同层横档应在同一平面上，其高低偏差不应大于5mm，托臂、支吊架沿桥架走向左右偏差不应大于10mm。

　　6. The same level crossbar of each bracket should be on the same plane, with a height deviation of no more than 5mm. The deviation of the support arm and hanger along the direction of the bridge should not exceed 10mm.

　　7、水平安装电缆桥架的金属支架或托臂间距应满足设计要求，当无设计要求时，间距宜为2m，在转弯处、终端处及其他重要的位置可适当减小间距；垂直安装时可适当增大间距。弯通、三通处应按设计或桥架样本增加加强支架。

　　7. The spacing between metal brackets or support arms for horizontally installed cable trays should meet the design requirements. When there are no design requirements, the spacing should be 2m. The spacing can be appropriately reduced at turns, terminals, and other important positions; When installed vertically, the spacing can be appropriately increased. At bends and tees, reinforced brackets should be added according to the design or bridge samples.

　　8、电缆桥架的安装程序是先主线，后分支线；先将弯通、三通和大小头定位后，再进行直线段的安装。

　　8. The installation procedure for cable trays is to start with the main line and then branch lines; First, position the bends, tees, and reducers before installing the straight sections.

　　9、预制桥架应采用机械切割、钻孔。制作好的桥架应平整，内部光洁、无毛刺。预制多层桥架时，弯曲部分弧度应一致，层间间距均匀，误差允许±3mm。

　　9. Prefabricated cable trays should be mechanically cut and drilled. The fabricated bridge should be flat, with a smooth interior and no burrs. When prefabricating multi-layer cable trays, the curvature of the bent parts should be consistent, the spacing between layers should be uniform, and the allowable error is ± 3mm.

　　10、桥架在每个支架上的固定应牢固，桥架内、外连接板应齐全，连接板的螺栓应紧固，螺母应位于桥架的外侧。

　　10. The fixation of the bridge on each bracket should be firm, the internal and external connection plates of the bridge should be complete, the bolts of the connection plates should be tightened, and the nuts should be located on the outside of the bridge.

　　11、电缆桥架的层间允许小距离当无设计要求时，可采用桥架的外壳高度加100mm，但层间净距不应小于两倍电缆外径加10mm。35kV及以上高压电缆不应小于两倍电缆外径加50mm。

　　11. When there are no design requirements, the minimum allowable distance between layers of cable trays can be increased by 100mm from the height of the tray shell, but the clear distance between layers should not be less than twice the maximum cable outer diameter plus 10mm. High voltage cables of 35kV and above should not be less than twice the maximum cable outer diameter plus 50mm.

　　12、电缆桥架上层及下层到楼板和地面的距离，当无设计要求时，上层不宜小于350~450mm，下层不宜小于100~150mm。

　　12. When there are no design requirements, the distance from the top and bottom layers of the cable tray to the floor and ground should not be less than 350-450mm for the top layer and 100-150mm for the bottom layer.

　　13、合金桥架在钢制支、吊架上固定时，应在接触面处预先涂一层导电膏或中性凡士林油。14、当直线段钢制电缆桥架超过30m，铝合金或玻璃钢制电缆桥架超过15m时，桥架不宜直接固定在支架上，应在支架两侧焊接导向板或在桥架内侧焊接压板，使电缆桥架在导向板或压板内能够滑动自如，桥架接口处应预留适当的膨胀间隙。

　　13. When fixing alloy cable trays on steel supports and hangers, a layer of conductive paste or neutral Vaseline oil should be applied in advance at the contact surface. 14. When the straight steel cable tray exceeds 30m and the aluminum alloy or fiberglass cable tray exceeds 15m, the tray should not be directly fixed on the support. Guide plates should be welded on both sides of the support or pressure plates should be welded on the inside of the tray to allow the cable tray to slide freely inside the guide plates or pressure plates. Adequate expansion gaps should be reserved at the interface of the tray.

　　15、电缆桥架转弯处的转弯半径，不应小于该桥架上电缆小允许弯曲半径的值。

　　15. The turning radius at the turning point of the cable tray should not be less than the maximum allowable bending radius of the cable on the tray.

　　16、因受空间条件限制不方便装设弯通或有特殊要求时，可选用软接板、铰接板。

　　16. When it is inconvenient to install bends or there are special requirements due to space constraints, flexible joints or hinged joints can be used.

　　17、需要在托盘底、侧板开保护管引出孔时，应采用油压开孔机或其他机械开孔，不得用电弧焊、气焊切割。开孔后边缘应打磨光滑，并采用合适的橡皮护圈保护电缆。梯架式电缆桥架不允许在侧板上开孔，保护管应采用特殊卡件固定。

　　17. When it is necessary to open protective tube outlet holes on the bottom and side plates of the tray, hydraulic drilling machines or other mechanical drilling should be used, and arc welding or gas welding cutting should not be used. After opening, the edge should be polished smooth and a suitable rubber guard should be used to protect the cable. Ladder type cable trays are not allowed to have holes on the side panels, and protective pipes should be fixed with special clamps.

　　18、低压电力电缆与控制电缆共用同一托盘或梯架，以及高压电缆与低压电缆共用同一托盘或梯架时，相互间宜设置隔板，隔板应低于桥架高度。

　　18. When low-voltage power cables and control cables share the same tray or ladder, and high-voltage cables and low-voltage cables share the same tray or ladder, it is advisable to set up partitions between them, which should be lower than the height of the bridge.

　　19、不同种类电缆所占用的电缆桥架间隔宽度应符合设计要求，隔板固定应采用专用卡件。

　　19. The spacing width of cable trays occupied by different types of cables should meet the design requirements, and dedicated clamps should be used to fix the partitions.

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