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第一个五年计划期间,在电站建设中,广泛使用了15～21米的较小跨度的钢筋混凝土主厂房屋架代替钢屋架,节约了许多钢材。由于电站机组容量不断增大,屋架的跨度与荷重也随之加大(一般为27～30米),若用普通的钢筋混凝土屋架,难免产生裂纹,只有采用预应力混凝土屋架才能克服这个缺点,节约更多的钢材。在电站建设中采用钢绞线预应力混凝土屋架的研究工作,1956年即已开始,1956年底提出30米跨度的
During the first five-year plan, instead of using steel truss frames, the main span of 15 to 21 meters of reinforced concrete main-plant buildings was widely used in the construction of power stations, saving a great deal of steel. Due to the increasing capacity of generating units, the span and load of roof truss also increase (usually 27-30 meters). If ordinary reinforced concrete roof truss is used, cracks will inevitably occur. Only using prestressed concrete truss can overcome this shortcoming. Save more steel. In the construction of power plants using strand prestressed concrete roof truss research work, has already begun in 1956, proposed by the end of 1956 30 meters span