1.确定方向：根据建筑平面布置图,结合空调管线和电气管线等设置情况、方便维修,以及电缆路由的疏密来确定电缆桥架的佳路由。在室内,尽可能沿建筑物的墙、柱、梁及楼板架设,如许利用综合管廊架设时,则应在管道一侧或上方平行架设,并考虑引下线和分支线尽量避免交叉,如无其它管架借用,则需自设立(支)柱。

　　1. Determine the direction: According to the layout of the building, combined with the setting of air-conditioning pipelines and gas pipelines, convenient maintenance, and the density of cable routing to determine the best route of cable bridge. In the interior, as far as possible along the walls, columns, beams and floor slabs of the building, when using the comprehensive pipeline gallery to erect, it should be parallel on one side or above the pipeline, and consider the lead line and branch line as far as possible to avoid crossing, if there is no other pipe rack to borrow, it is necessary to set up (support) pillars.

　　2.荷载计算：计算电缆桥架主干线纵断面上单位长度的电缆重量。

　　2. Load calculation: Calculate the weight of the cable per unit length on the longitudinal section of the main trunk line of the cable bridge.

　　3.确定桥架的宽度：根据布放电缆条数、电缆直径及电缆的间距来确定电缆桥架的型号、规格,托臂的长度,支柱的长度、间距,桥架的宽度和层数。

　　3. Determine the width of the bridge: determine the type and specification of the cable bridge, the length of the bracket, the length and spacing of the pillars, the width and the number of layers of the bridge according to the number of discharge cables, cable diameter and cable spacing.

　　4.确定安装方式：根据场所的设置条件确定桥架的固定方式,选择悬吊式、直立式、侧壁式或是混合式,连接件和紧固件一般是配套供应的,根据桥架结构选择相应的盖板。

　　4. Determine the installation mode: determine the fixing mode of the bridge frame according to the setting conditions of the place, choose suspension type, vertical type, side wall type or hybrid type, the connectors and fasteners are generally supplied with a complete set, and select the corresponding cover according to the structure of the bridge frame.

　　5.绘出电缆桥架平、剖面图,局部部位还应绘出空间图,开列材料表。

　　5. Draw the plane and section of cable bridge, and the space map and material table should also be drawn in part.

　　电缆桥架的选择要求

　　Selection Requirements of Cable Bridge Frame

　　当钢制直线段长度超过30m，铝合金电缆桥架超过15m时．或当玻璃钢电缆桥架经过建筑伸缩(沉降)缝时应留有O-30mm补偿余量．其连接宜采用伸缩连接板。

　　When the length of steel straight section exceeds 30m and the length of aluminium alloy cable tray exceeds 15m, or when the FRP cable tray passes through the expansion (settlement) joint of the building, the O-30mm compensation margin should be left. The expansion connection plate should be adopted.

　　电缆梯架、托盘宽度和高度的选择应符合填充率的要求，玻璃钢电缆桥架在梯架、托盘内的填充率一般情况下，动力电缆可取40%-50%，控制电缆可取50%。70%．且宜预留l0%一252工程发展裕量。

　　The selection of cable ladder, tray width and height should meet the requirements of filling rate. Generally, the filling rate of FRP cable bridge in ladder and tray is 40% - 50% for power cable and 50% for control cable. 70%, and it is advisable to reserve l0% to 252 project development margin.

　　在选择玻璃钢电缆桥架的荷载等级时，电缆桥架的工作均布荷载不应大于所选电缆桥架荷载等级的额定均布荷载，如果电缆桥架的支吊架的实际跨距不等于2m时．则工作均布荷载应满足：式中qG----工作均布荷载，kN/m；qE----额定均布荷载，kN/m；LG----实际跨距，m。

　　When choosing the load grade of FRP cable bridge, the working uniform load of the cable bridge should not be greater than the rated uniform load of the load grade of the selected cable bridge. If the actual span of the suspension of the cable bridge is not equal to 2 m, the working uniform load should meet the following requirements: middle qG - - working uniform load, kN/m; qE - - rated uniform load, kN/m; LG - - actual span, M.

　　桥架的额定均布荷载等级需要屏蔽电磁干扰的电缆线路．或有防护外部影n向如户外日照，油，腐蚀性液体、易燃粉尘等环境要求时．应选用无孔托盘式玻璃钢电缆桥架。

　　When the rated uniform load grade of the bridge needs to shield the cable lines from electromagnetic interference, or when there are environmental requirements such as outdoor sunshine, oil, corrosive liquids, flammable dust, etc. to protect the external shadow, the non-hole tray type FRP cable bridge should be selected.

　　在容易积聚粉尘的场所，玻璃钢电缆桥架应选用盖板；在公共通道或室外跨越道路段，底层桥架上宜加垫板或使用无孔托盘。

　　In places where dust is easy to accumulate, cover plate should be used for FRP cable tray; in public passage or outdoor crossing road section, pad plate or holeless tray should be added to bottom bridge tray.