30m缺陷预制箱梁
30m-defected precast box beam
大型预制空心楼板
large-scale prefabricated empty ceiling
钢－混凝土预制板组合梁
composite steel-precast concrete panel beams
钢筋混凝土预制方桩
Reinforced concrete precast square piles
混凝土预制管片
Concrete precast pipe element
混凝土预制空心板
pre-cast concrete hollow slab
静压预制管桩
static pressure fabricated pipe-pile
冷铺预制材料
cold applied preformed material
梁体预制安装
Beam body prefabricated installation
全预制装配式变电站
prefabricated composite substation