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按主梁結構形式分
(起重機)單主梁門式起重機
單主梁懸臂門式起重機結構簡單,製造安裝方便,自身質量小,主梁多為偏軌箱形架結構。與雙主梁門式起重機相比,整體剛度要弱一些。因此,當起重量Q≤50起重機、跨度S≤35m時,可采用這種形式。單主門梁式起重機門腿有L型和C型兩種形式.L型的製造安裝方便,受力情況好,自身質量較小,但是,吊運貨物通過支腿處的空間相對小一些。C型的支腳做成傾斜或彎曲形,目的在於有較大的橫向空間,以使貨物順利通過支腳。






