空心梁 meaning in English

box girder
cellulargirder
cored beam
hollow beam
hollow girder
hollow spar

200mm 100mm safety fences and barriers for highways - specification for components for tensioned rectangular hollow section beam 200 mm x 100 mm safety fence
公路的安全栏杆和护栅.张紧式矩形空心梁
100mm 100mm safety fences and barriers for highways - specification for components for tensioned rectangular hollow section beam 100 mm x 100 mm safety fence
公路的安全栏杆和护栅.张紧式矩形空心梁