The bracket and vertical column of cable tray will be installed by welding or expansion bolt of the basement . the welding place treatment will be done by painting .

• 桥架的立柱、托臂等支架可与基础预埋件焊接固定，也可采用膨胀螺栓固定，对于现场焊接处一定要做好防腐处理，通常由用户现场涂刷防腐漆。