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根据国家建设和发展预应力钢筋拉伸机系列产品的需要,1979年以来中国建筑科学研究院建筑结构研究所设计了120吨预应力千斤顶,并于1980年上半年在广西柳州市建筑机械厂试制了10台样机,经过试验,性能良好。目前样机已在一些铁路预应力钢筋混凝土桥梁工程中进行工艺试验和试用,柳州市建筑机械厂已开始小批量试生产。 120吨预应力千斤顶以张拉千斤顶为主机,配套各种附件后可组成以下三种型式:
According to the needs of the national construction and development of prestressed steel stretcher products, the 120 tons of prestressed jacks have been designed by the Institute of Building Structures of the China Academy of Building Research since 1979, and were trial-produced in Guangxi Liuzhou Construction Machinery Factory in the first half of 1980. Ten prototypes have been tested and performed well. At present, prototypes have been undergoing process trials and trials in some railway prestressed reinforced concrete bridge projects. Liuzhou Construction Machinery Factory has begun trial production in small batches. 120 tons of prestressed jacks are mainly used for tensioning jacks. After supporting various accessories, the following three types can be formed: