hand-dug caisson 人工挖掘沉箱 ; 手挖沉箱 ; 人工发掘沉箱

hand-dug caisson construction 手挖沉箱建造工程

hand-dug caisson operation 手挖沉箱工程

hand dug caisson 手挖沉箱

hand dug caisson type piles 手挖掘沉箱桩

dug caisson construction 手挖沉箱建造工程

man-dug caisson foundation 挖孔墩

large diameter hand-dug caisson 大直径人工挖孔桩