预应力结构中所用的高强粗钢筋是通过精轧而成的,其外形在全长上轧有螺旋形外螺纹,使用时可截取任意长度;用带有内螺纹的连接器又可把钢筋接长为任意长度;用带有内螺纹的锚具又能进行锚固。这些优点是其他预应力钢材所没有的,它是发展顶应力结构的一种新材料。精轧螺纹粗钢筋及其施工方法由西德DYWIDAG公司于70年代首创并获得专利权,在日本、意大利、荷兰等国广泛应用。 High-strength rough steel used in prestressed structure is made by finish rolling, the shape of which is rolled with a helical external thread over the entire length, which can be cut in any length when it is used; Length of any length; with an internal thread anchors can anchor. These advantages are not found in other prestressed steels, which are a new material for the development of top-stressed structures. Finished thread coarse steel bar and construction method by the West Germany DYWIDAG company in the 1970s and won the patent, widely used in Japan, Italy, the Netherlands and other countries.