一般说来,钢筋混凝土预应力大跨度楼板应当具有较高的隔热隔声性能,在某些情况下还要用于敷设管道。苏联等国现在采用的大跨度空心楼板,当纵向孔道是矩形截面时,特点是制造复杂,而椭圆和圆孔则混凝土和钢筋消耗量较高。苏联梯比里斯试验设计科学研究院研究了一种新型的大跨度预应力箱形组合板, In general, reinforced concrete prestressed long-span floor slabs should have high thermal insulation performance, and in some cases also be used for laying pipes. Large-span hollow slabs currently used in countries such as the Soviet Union, when the longitudinal tunnel is a rectangular section, are characterized by complex manufacturing, while elliptic and round holes have high concrete and steel consumption. The Soviet Tbilisi Institute of Design and Research studied a new type of large-span prestressed box-shaped composite panels.