1、需屏蔽电器干扰的电缆网路或有防护外部（如：有腐蚀液体，易燃粉尘等环境）影响的要求时，应选用（FB）类槽式复合型防腐屏蔽电缆桥架（带盖）
1. If the cable network needs to be shielded from electrical interference or the requirement of protecting the external environment (such as corrosive liquids, inflammable dust and so on), the groove type (FB) composite anticorrosive shielding cable bridge (with cover) should be selected.
2、强腐蚀性环境应采用（F）类复合环氧树脂防腐阻燃型电缆桥架。托臂、支架也要选用同样材料，提高桥架及附件的使用寿命，电缆桥架。在容易积灰和其它需遮盖的环境或户外场所宜加盖板。
2, strong corrosive environment should adopt (F) composite epoxy resin fire retardant and flame retardant cable tray. The bracket and bracket should also use the same material to improve the service life of the bridge and accessories, and the cable bridge. It is advisable to add cover plates to the environment or outdoor areas where ash is easily accumulated and other need to be covered.
3、除上述情况外，可根据现场还环境及技术要求选用托盘式、槽式、梯级式、玻璃防腐阻燃电缆桥架或钢质普通型桥架。在容易积灰和其它需遮盖的环境或户外场所宜加盖板。
3. In addition to the above, tray type, trough type, cascade type, glass anti-corrosion and flame-retardant cable bridge or ordinary steel bridge can be selected according to the site environment and technical requirements. It is advisable to add cover plates to the environment or outdoor areas where ash is easily accumulated and other need to be covered.
4、在公共通道或户外跨越道路段，底层梯级的底部宜加垫板或在该段使用托盘 。大跨距跨越公共通道时，可根据用户要求提高桥架的载荷能力或选用行架。
4. When crossing the road section in public passage or outdoor, the bottom of the bottom step should be padded or tray used in this section. When the large span crosses the public passage, the load capacity of the bridge can be raised according to the user requirements or the traveling frame can be selected.
5、大跨距（>3m）要选用复合型桥架（FB）。
5, large span (>3m) to choose a composite bridge (FB).
6、户外要选用复合环氧树脂桥架（F）。
6, outdoor composite epoxy resin bridge (F).
规格选择
Specification selection
1、桥架的宽度和高度就按下表选择，并应符合电缆填充率不超过有关标准规范的规定值，动力电缆可取40-50%，控制电缆可取50-70%，另外需予留10-25%的式程发展余量。
1. The width and height of the bridge frame shall be selected according to the following table, and the cable filling rate shall not exceed the stipulated value of the relevant standard specification. The power cable shall be 40-50%, the control cable shall be 50-70%, and 10-25% of the stroke development margin shall be reserved.
2、各种弯通及附件规格应符合工程布置条件并与桥架相配套。
2, all kinds of bending and accessories specifications should conform to the engineering layout conditions and match with the bridge frame.
3、支、吊架规格的选择，应按桥架规格、层数、跨距等条件配置。并应满足荷载的要求。
3, the selection of the specifications of hangers and hangers should be arranged according to the specifications, storeys and span of bridge. And should meet the load requirements.
4、桥架横截面积的选择见表
4. The choice of the cross section area of the bridge is shown in table.
支、吊架的配置
Allocation of supports and hangers
1、户内支、吊短跨距一般采取1.5-3m。户外立柱中跨距一般采取6m。
1, indoor support and short span are generally 1.5-3m. The middle span of outdoor columns is generally 6m.
2、非直线段的支、吊架配置就遵循以下原则。当桥架宽度<300mm时，应在距非直线段与直线结合处300-600m的直线段侧设置一个支、吊架。当桥架宽度>300mm时，除符合下述条件外，在非直线段中部还应增设一个支、吊架。
2, the configuration of the support and hanger of the non straight line should follow the following principles. When the width of the bridge is less than 300 mm, a support and hanger should be installed at the side of the straight line 300-600 m away from the non-linear section and the straight line. When the width of the bridge is more than 300 mm, in addition to meeting the following conditions, a support and hanger should be added in the middle of the non-linear section.
3、桥架多层设置时层间中心距为200，250，300，350mm。
3. When the bridge is multi-storey, the center distance between layers is 200250300350mm.
4、桥架直线段每隔50m应予留伸缩缝20-30mm（金属桥架）。
4, the bridge straight line should be provided with expansion joints 20-30mm (metal bridge) every 50m.