gantry

gantry
/ˈgæntrɪ; `ɡæntrɪ/ n
tall metal frame supporting a crane, signals on a railway or motorway, rocket-launching equipment, etc 金属台架; （起重的）龙门架; （铁路或高速公路的）信号机架; （火箭发射设备的）竖架.

牛津英汉双解词典