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长期以来,我国使用的预制混凝土空心板跨度都在6.0m以内,跨度不大于4.2m的楼盖和屋面多采用厚度120mm左右的以冷拔低碳钢丝配筋的预应力空心板,4.2～6.0m的楼盖和屋面多采用厚度180mm以冷拉钢筋(或冷拔低碳钢丝)配筋的预应力空心板。但是,近几年这两种板已不太能适应日益发展的建筑业的要求,除冷拔钢丝握裹性能和延伸率较差外,其跨度过小已成为制约其在建筑工程中大量应用的主要原因。跨度不大制约了承重墙的位置,使单元内房间的灵活分割无法实现。二十一世纪小康住宅需要跨度6～9m的长跨楼板以满足住房多样性及可变性的需求。
For a long time, the span of precast concrete hollow slabs used in our country is within 6.0m, and prestressed hollow slabs with thickness of about 120mm are used for slabs and roofs with a span of not more than 4.2m, with cold drawn low-carbon steel wire reinforcement, 4.2-6.0. m roofs and roofs are mostly made of prestressed hollow slabs with a thickness of 180mm to cold-reinforce steel (or cold drawn low-carbon steel) reinforcements. However, in recent years, these two types of boards have not been able to meet the requirements of the growing construction industry. Except for the poor gripping performance and elongation rate of cold drawn steel wire, its small span has become a constraint to its large-scale application in construction projects. The main reason. The span does not constrain the position of the bearing wall, making it impossible to achieve flexible partitioning of rooms within the unit. In the 21st century, well-off houses need to span long-span floors of 6 to 9 meters in order to meet the needs of housing diversity and variability.