根据我国桥梁建设的需要,自1979年以来,中国建筑科学研究院结构所先后与铁道部第二工程局科学技术研究所、铁道部株洲桥梁工厂和铁道部专业设计院合作开展主要由JM15型锚具和YC120型千斤顶组成的“5～6根7φ5钢绞线束预应力张拉锚固体系”的研究课题。通过试制、试验、试用和正式批量生产应用,于1984年4月17～19日,中国 According to the needs of China’s bridge construction, since 1979, the China Institute of Building Research has successively cooperated with the Institute of Science and Technology of the Second Engineering Bureau of the Ministry of Railways, the Zhuzhou Bridge Factory of the Ministry of Railways, and the professional design institute of the Ministry of Railways to carry out mainly JM15 type anchors. With the YC120 type jack consisting of “5 ~ 6 7φ5 Strand strand prestressed tensile anchor system” research. Through trial production, trials, trials, and mass production applications, from April 17 to 19, 1984, China