Abstract：Research purposes: Research purpose: In china，Three － cantilever suspension installed on solo Prestressed concrete pole with acrossed － webmember is widely used in station throat area in the passenger and cargo railway with the speed of 200km/h and below． When the railway system is under operation，the overhead contact system needs overhaul or replacement in time． However，the construction method of replacing traditional cantilever insulator cannot satisfy the special requirement of the three － cantilever suspension system，which may cause cracking mast，distorting mast， rupturing mast and so on，even more serious accident in overhead contact system． This paper calculates and analyses the design selection and construction process of the three － cantilever mast in order to provide the basis for safe operation and maintenance in the overhead contact system．
Research conclusions: ( 1 ) the Increased attached load during construction and Maintenance must be taken into consideration fully and comprehensively，when choosing the mast type in design． ( 2 ) During construction and Maintenance，the reasonable construction method could avoid increasing attached load in overhead contact system． ( 3) Two more reasonable methods of replacing cantilever insulator in mast with three － cantilever suspension are provided． Fir post is used to uninstall and change process． OCS overhaul working cart is used to uninstall and change process．
杨佳. 既有铁路三腕臂支柱悬挂的设计和检修[J]. 铁道工程学报, 2012, 29(4): 72-75.
YANG JIA. The Design and Overhaul for Mast with Three － cantilever Suspension in Built Railway. 铁道工程学报, 2012, 29(4): 72-75.
Huang Shuangsheng． Construction Technique for Transition Project of Overhead Contact Line on Existing Electrified Railway［J］． Journal of Railway Engineering Society， 2003( 4) : 105 － 110．
［6］ 铁运［2007］69 号，接触网运行检修规程［S］．
Railway Transportation ［2007］No． 69，Maintenance Regulation for Overhead Contact System［S］．
2012, Vol. 29 
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