門(men)(men)(men)(men)(men)式(shi)起(qi)(qi)重(zhong)(zhong)機(ji)(又稱(cheng)龍(long)門(men)(men)(men)(men)(men)起(qi)(qi)重(zhong)(zhong)機(ji))是橋架(jia)(jia)(jia)(jia)(jia)通(tong)過兩側(ce)支(zhi)(zhi)(zhi)(zhi)腿(tui)支(zhi)(zhi)(zhi)(zhi)撐(cheng)(cheng)在地(di)面軌道上(shang)(shang)的(de)橋架(jia)(jia)(jia)(jia)(jia)型起(qi)(qi)重(zhong)(zhong)機(ji)。在結(jie)構(gou)(gou)上(shang)(shang)由門(men)(men)(men)(men)(men)架(jia)(jia)(jia)(jia)(jia)、大(da)(da)車運行(xing)機(ji)構(gou)(gou)、起(qi)(qi)重(zhong)(zhong)小(xiao)車和電氣(qi)部(bu)分等組(zu)成。有的(de)門(men)(men)(men)(men)(men)式(shi)起(qi)(qi)重(zhong)(zhong)機(ji)只在一側(ce)有支(zhi)(zhi)(zhi)(zhi)腿(tui)，另一側(ce)支(zhi)(zhi)(zhi)(zhi)撐(cheng)(cheng)在廠房或棧(zhan)橋上(shang)(shang)運行(xing)，稱(cheng)作(zuo)半門(men)(men)(men)(men)(men)式(shi)起(qi)(qi)重(zhong)(zhong)機(ji)。門(men)(men)(men)(men)(men)式(shi)起(qi)(qi)重(zhong)(zhong)機(ji)的(de)門(men)(men)(men)(men)(men)架(jia)(jia)(jia)(jia)(jia)上(shang)(shang)部(bu)橋架(jia)(jia)(jia)(jia)(jia)(含主梁和端(duan)梁)、支(zhi)(zhi)(zhi)(zhi)腿(tui)、下橫梁等部(bu)分構(gou)(gou)成。為了擴大(da)(da)起(qi)(qi)重(zhong)(zhong)機(ji)作(zuo)業(ye)范(fan)圍，主梁可以(yi)向一側(ce)或兩側(ce)伸(shen)出支(zhi)(zhi)(zhi)(zhi)腿(tui)以(yi)外(wai)，形成懸臂(bei)。也可采用(yong)帶臂(bei)架(jia)(jia)(jia)(jia)(jia)的(de)起(qi)(qi)重(zhong)(zhong)小(xiao)車，通(tong)過臂(bei)架(jia)(jia)(jia)(jia)(jia)的(de)俯仰和旋轉(zhuan)擴大(da)(da)起(qi)(qi)重(zhong)(zhong)機(ji)作(zuo)業(ye)范(fan)圍。