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　　門(men)(men)式(shi)起(qi)(qi)重(zhong)(zhong)機(ji)(又稱(cheng)龍(long)門(men)(men)起(qi)(qi)重(zhong)(zhong)機(ji))是橋(qiao)架(jia)(jia)(jia)通(tong)過兩側支腿支撐(cheng)在(zai)地面(mian)軌道(dao)上的橋(qiao)架(jia)(jia)(jia)型起(qi)(qi)重(zhong)(zhong)機(ji)。在(zai)結構(gou)上由門(men)(men)架(jia)(jia)(jia)、大(da)車(che)運行機(ji)構(gou)、起(qi)(qi)重(zhong)(zhong)小車(che)和(he)電(dian)氣部分等組成。有(you)的門(men)(men)式(shi)起(qi)(qi)重(zhong)(zhong)機(ji)只在(zai)一(yi)(yi)側有(you)支腿，另一(yi)(yi)側支撐(cheng)在(zai)廠房或(huo)棧橋(qiao)上運行，稱(cheng)作(zuo)半(ban)門(men)(men)式(shi)起(qi)(qi)重(zhong)(zhong)機(ji)。門(men)(men)式(shi)起(qi)(qi)重(zhong)(zhong)機(ji)的門(men)(men)架(jia)(jia)(jia)上部橋(qiao)架(jia)(jia)(jia)(含主梁和(he)端梁)、支腿、下橫(heng)梁等部分構(gou)成。為了擴(kuo)大(da)起(qi)(qi)重(zhong)(zhong)機(ji)作(zuo)業(ye)范圍(wei)，主梁可以向一(yi)(yi)側或(huo)兩側伸出支腿以外，形成懸臂。也可采用帶臂架(jia)(jia)(jia)的起(qi)(qi)重(zhong)(zhong)小車(che)，通(tong)過臂架(jia)(jia)(jia)的俯仰和(he)旋(xuan)轉擴(kuo)大(da)起(qi)(qi)重(zhong)(zhong)機(ji)作(zuo)業(ye)范圍(wei)。