抓鬥橋式起重機主要由箱形橋架

、抓鬥小車、大車運行機構、司si機ji室shi和he電dian氣qi控kong製zhi係xi統tong組zu成cheng。取qu物wu裝zhuang置zhi為wei抓zhua鬥dou。抓zhua鬥dou小xiao車che上shang布bu置zhi有you起qi升sheng機ji構gou和he開kai閉bi機ji構gou，抓zhua鬥dou以yi四si根gen鋼gang絲si繩sheng分fen別bie纏chan繞rao在zai起qi升sheng和he開kai閉bi卷juan筒tong上shang。開kai閉bi機ji構gou驅qu動dong抓zhua鬥dou閉bi合he，抓zhua取qu物wu料liao，當dang鬥dou口kou閉bi合he後hou
，立li即ji開kai動dong起qi升sheng機ji構gou
，使shi四si根gen鋼gang絲si繩sheng平ping均jun受shou載zai進jin行xing起qi升sheng工gong作zuo。卸xie料liao時shi隻zhi開kai動dong開kai閉bi機ji構gou
，鬥dou口kou隨sui即ji張zhang開kai
，傾qing斜xie物wu料liao。本ben起qi重zhong機ji除chu起qi升sheng機ji構gou不bu同tong外wai
，其qi餘yu結jie構gou部bu分fen與yu吊diao鉤gou橋qiao式shi起qi重zhong機ji基ji本ben相xiang同tong。