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1975年以来,根据国家建委下达的任务,由中国建筑科学研究院建筑结构研究所组织四平市钢筋拉伸机厂、大连拉伸机厂、柳州市建筑机械厂、北京市第一建筑构件厂、天津市第二建筑工程公司、上海市混凝土制品三厂等单位,成立液压拉伸机联合设计组,进行了预应力混凝土拉伸机的选型与定型研究工作。现已完成此项任务,并经国家建委机械局批准,作为全国统一定型产品。为了推广应用新产品,本刊发表YL60型千斤顶、YC60型千斤顶、LB4/500型电动油泵等三篇文章,供大家参考。
Since 1975, according to the task of the National Construction Committee, the Institute of Building Structure, China Academy of Building Research organized the Siping City Stretching Machine Factory, Dalian Stretching Machine Factory, Liuzhou Construction Machinery Factory, and the Beijing First Building Component Factory. Tianjin No. 2 Construction Engineering Co., Ltd., Shanghai No. 3 Concrete Plant and other units established a joint design group of hydraulic tensioners, and conducted research on the selection and finalization of prestressed concrete stretchers. This task has now been completed and approved by the Machinery Bureau of the State Construction Commission as a unified product of the country. In order to promote the use of new products, the publication published YL60 jacks, YC60 jacks, LB4/500 electric oil pump and other three articles for your reference.