钢筋混凝土梁预应力补强,在国外已被广泛应用。它的优点是补强结构简单,材料节省,现场装配和安装方便,不减少空问高度,能增加较大的承载力。老厂挖潜改造中经常遇到需要增加钢筋混凝土梁的承载能力,采用此法最为适宜。如某制药厂的维生素C车间,在设备安装时连续梁被设备冲击断裂,下垂了5至6cm,楼面丧失了承载能力。采用预应力下撑式补强拉杆后,不仅提高了梁的承载能力,保证了不小于楼板面原设计所能承担的荷重,而且使梁恢复到原来的设计标高。使用多年后没有发现缺陷。又如某化肥丁铜铣厂房,为了增加生产能力,将原来安装在三楼上的回流塔和再生器等设备加大,其原来设备、物料、保温和管道等总重由59.88吨增加到103.2吨,由原来的4 Reinforced concrete beam prestressed reinforcement has been widely used abroad. Its advantages are simple reinforcement structure, material saving, convenient on-site assembly and installation, no reduction of space height, and increase of large bearing capacity. In the old factory’s potential tapping reconstruction, it is often encountered that it is necessary to increase the bearing capacity of reinforced concrete beams, and this method is most suitable. For example, in a vitamin C plant of a pharmaceutical factory, the continuous beam was broken by the equipment during the installation of the equipment and it sag 5 to 6 cm. The floor has lost its bearing capacity. The use of pre-stressed, under-supported tie rods not only improves the load-carrying capacity of the beam, but also ensures that the load that can be borne by the original design of the floor slab is not less than the original design elevation. No defects were found after years of use. Another example is a fertilizer D copper milling plant, in order to increase production capacity, the original installed in the third floor of the reflux tower and regenerator and other equipment to increase, the original equipment, materials, insulation and piping, etc. total weight increased from 59.88 tons to 103.2 T, from the original 4