龍門起重機的起升機構、xiaocheyunxingjigouheqiaojiajiegou，yuqiaoshiqizhongjijibenxiangtong。youyukuaduda，qizhongjiyunxingjigoudaduocaiyongfenbiequdongfangshi，yifangzhiqizhongjichanshengwaixieyunxingerzengjiazuli，shenzhifashengshigu。longmenqizhongjideqizhongxiaochezaiqiaojiashangyunxing，youdeqizhongxiaochejiushiyitaibijiaxingqizhongji。qiaojialiangcedezhituiyibandoushigangxingzhitui；跨度超過30米mi時shi，常chang是shi一yi側ce為wei剛gang性xing支zhi腿tui，而er另ling一yi側ce通tong過guo球qiu鉸jiao和he橋qiao架jia連lian接jie的de柔rou性xing支zhi腿tui，使shi門men架jia成cheng為wei靜jing定ding係xi統tong，這zhe樣yang可ke以yi避bi免mian在zai外wai載zai荷he作zuo用yong下xia由you於yu側ce向xiang推tui力li而er引yin起qi附fu加jia應ying力li，也ye可ke補bu償chang橋qiao架jia縱zong向xiang的de溫wen度du變bian形xing龍long門men起qi重zhong機ji的de受shou風feng麵mian積ji大da,為防止在強風作用下滑行或翻倒，裝有測風儀和與運行機構聯鎖的起重機夾軌器。橋架可以是兩端無懸臂的；也可以是一端有懸臂或兩端都有懸臂的，以擴大作業範圍。半龍門起重機橋架一端有支腿，另一端無支腿，直接在高台架上運行。
